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We have received a lot of valuable comments from our users. We will make use of your feedback to improve our products. Thank you!

I plan to use the system for movie theater sound alignment. Each channel of the digital sound processor is equalized using an "X-Curve" weighting. The overall sound levels are set to 85db-spl for the screen channels and 82db-spl for the surround channels. The sub woofer is equalized at the 85db-spl level and then bumped up 10db.

We also check the nominal NC level to confirm we are within SMPTE and THX standards. With this we can also determine if the HVAC system or an exterior noise source are causing issues. Lastly, on new installs we check the RT-60 measurements to also confirm compliance with the SMPTE standards. We might also be able to use the oscilloscope for A-Chain alignment (optical and digital readers). I would have to confirm it can handle it, but it looks like it can.

In the US most people use the old THX R2 systems or hardware RTAs, such as Ivie, Gold Line or equivalent. Almost everybody uses a microphone multiplexer with four calibrated microphones (not perfect microphones, but very good after applying the calibration file). Each of the four microphones has to be checked individually because there is a maximum 2db deviation between locations in the main listening areas of the auditoriums to meet standards (same sound for everybody). Some people use the SIA Smaart package. Your package is much more advanced, but lacks a few of the movie theater specific features (X-Curve for example), but also has a much better interface.

If the best of all worlds was available, it would be great if the software handled four channels and digitally multiplexed the channels, noting any deviation between the channels that exceed a user definable threshold. Multiplexing or averaging is preferred to mixing, because the peaks and valleys remain rather than getting "mixed" out.

I hope this helps you understand. I have been looking a long tome for a cost effective software based system, that handles most of our needs and also is easy to use (a good interface is very important). There does not appear to any product that meets all of our needs, let alone having a good interface.

Your high end package is more complete, with a great interface, but misses a few features that would make it easier to use for movie theater sound alignment. I was hoping, that if I got all the features I really needed inexpensively, I could do without some of the theater specific bells and whistles.

I located your software (DSSF3 Light) by a Google web search for audio freeware. I teach physics at the University of Kentucky, and I am setting up some student projects for elementary physics students in which they will measure acoustic resonances in tubes, jugs, boxes, rooms, musical instruments and so forth. I needed software that would allow me to record the acoustic responses to sine-wave frequency scans.

I use Windows XP, model Dell Latitude D810, computer with SigmaTel C-Major Audio sound card, electret microphone and external loudspeaker.

I have used the software for only a few hours, but I am convinced that it is superb for my purpose. However, in a frequency scan using the Signal Generator in a sweep mode, I wish that there was a display indicating the current output frequency, and also a means to step a fixed frequency output up or down manually by a pre-set increment in Hz or log (ratio).

I use RAL for music recording / production and it has made everything from recording to mastering so much easier because you can see the frequencies you are working with...
I am a freelance sound engineer specializing in live theatre and location recording. I am also a director of a new TV production company based in Warwick, UK.

I will be using RAL mainly for the analysis and calibration of PA systems in theatre pre-show and on the fly feedback reduction during production runs.

Effectively, I am replacing several aging bits of rack RTA equipment (specifically BSS units) with my laptop - which is also performing multi-channel playback duties.

I have found RAL to be the more straightforward and best value system I have used. The tone generator also surpasses anything I have seen in hardware based systems to date.
I am a piano tuner, technician, and rebuilder. I will be using DSSF3 Light to test and measure the quality of piano hammers and soundboards.
I'd be glad to tell you how I use the software and why I chose to get that particular model. I am in charge of all the audio systems at my church. I chose DSSF3 light because it fit my budget and it had all the features I need. I particularly like the spectrum analyzer. I use it and the pink noise generator to tune our PA system and monitors. I've tuned our main house mix and our three monitor mixes in our church auditorium, as well as a sound system for special events. I do not have a test mic so I've been using the AT3035 which I've found to be a very good mic with a pretty flat frequency response. I can also plug in my SPL meter to my laptop and measure sound that way. The SPL only measures sound in A weighing and C weighing but that is no problem with the DSSF3 spectrum analyzer because I can configure it for this. 

I also found it helpful to connect one input channel from the computer to the output of the mixer and the other input channel to the mic. Then I set the spectrum analyzer so that it shows both the left and right channel next to each other. This way I can compare what I'm sending to the speakers and see if it matches what the mic is hearing. I've found this to be a great tool in setting up an EQ. I was impressed how accurate the software was. I found that on my 1/3 octave EQ, turning up the 500 Hz channel would increase 500 hz on the computer and the same for each frequency. I also use the spectrum analyzer during a practice to set EQ's for microphones. I set the peak indicator to reset after 10 seconds. This way if I get feedback, I have up to 10 seconds to look at the computer and see exactly what frequency caused the feedback. 

I also find the oscilloscope to be a nice tool to identify where clipping is occurring. I can plug the input of my computer into various places in the audio chain and determine which device is causing clipping. I use the sound recorder as well. I've been quite busy these last 30 days using this analyzer! This Sunday we are having a banquet in our gymnasium so I will be tuning the PA system that we will be using. My typical setup is to use my laptop for audio playback, audio recording, and EQ setting. The DSSF3 performs the audio tuning function. It is a great tool that I wished I had a long time ago. I will be involved in another banquet this Christmas and fall as well as a musical for a school. I plan to use this software in all these occasions. 

The only suggestion I have so far is that I wish the recorder would record onto the hard drive instead of to memory or where ever it goes. This way one could use the recorder instead of a separate program. At my church, I record up to 1.5 hours so I have to use a separate program. If the sound recorder would record that long, it would eliminate the need for another software package. I am not multi-track recording on my laptop yet, and I typically edit recordings on a different computer so having this recorder record longer would be a big help. But that is my only suggestion. Hopefully this information helps you.

I have been trying our DSSF3 over the weekend. It looks to be a useful piece of software. I am an amateur sound recordist. When I mix my live recordings I use an oscilloscope, in X-Y mode, to monitor the phase relationships and overall two channel sound spread. 

The DSSF3-Light will meet my needs. I have a desktop PC I use at home and use a notebook PC when I record live and ambient sounds. I don't use these computers at the same time except when transferring the .WAV files to the desktop computer for editing. 

Suggestions for enhancements: An option that allows the user to choose background and track colors for the Oscilloscope. This would also be useful for some of the other instrument displays. An option that allows the Oscilloscope, and maybe some other displays, to have a 'Display Only" mode. This would make all the control disappear and only show a floating window. It would also be useful if this window could have an "Always On Top" mode and if these settings could be set with a right-click when hovering over the display. 

The DSSF3 program is being used in my PhD research into environmental noise analysis. As part of my research I am reviewing inexpensive high quality environmental noise analysis programs. The DSSF3 Light program is a good program for the testing of instruments.

The application notes written by YMEC are excellent and give some of the best explanations I have read / seen / heard for a very long time. The full EA program is excellent. 

I am using this Program to examine the envelopes of transmitted Amateur radio frequencies. I have built a hardware device to extract a sample of my RF output and will use the RAL oscilloscope to monitor the modulation.
I am using the software (RAL) in conjunction with optimum sound for my instrument making (violins, guitars etc. etc.).

I have never used this software before and I have had a look at your manuals online however, they are too technical for me to understand. I was hoping you had a dummy version in order for me to grasp the software more easily.

Basically I want to use the software to determine the different frequencies at which timber vibrates in order to receive optimum sound from the instrument. If you have some literature to explain this part of the software in lay mans terms, it would be greatly appreciated.

We are developers of audio equipment for the TV and radio broadcast industry. I am very impressed with your DSSF3 Light. It has been a big benefit to me. 
We are going to use RAL for analyzing the worship hall's sound. Sometimes we get interference and howling sound whenever the pastor walk around the stage, especially when they are using laveliars. So, whenever they are howling sound, we actually don't know what frequency is the culprit. Usually we just turn down the EQ knobs and try to get it back after the howling sound is gone.

But this was never satisfied. So I ask one of our PA member to search for a software that have spectrum analyzer, we found you. After downloaded the software and we jack the input from the mixer, we immediately can analyze what frequency is being used say, by the instruments, by the singer, by the pastor, then we can adjust those frequency to good effect.

Then when the howling sound came, we also immediately can see what was the offending frequency that peaks, and since your analyzer is using the 20-20 range, which is the same as our EQs, we immediately can turn down that frequency and the offending howling sound is immediately gone. Now, we are able to pin point and troubleshoot immediately with your software. So, after 2 weeks of testing, we all agreed this software is good and so we bought it.

Thank you

DSSF3 Realtime Analyzer is going to be used for measuring a cars inputs and outputs of the audio system. For example: is there a built in DSP in the head unit or separate amp, is there built in crossovers, is there a built in loudness control, and is there a built in time alignment.

Also will use it for studying how sounds reacts in the cars environment. For example: I would run test to figure out were the peeks and nulls would be, in the frequency response, as the pink noise is playing in the car.

I am very happy with your excellent software! I use DSSF3 Realtime Analyzer for test and repair of equipment in sound recording studios.
DSSF3 is a refined very wonderful software, and I can know that by intuition. I feel very happy that even an amateur like me can find such a great product on the Internet without effort. I am an newbie to the audiophile, so your detailed support is very helpful. I have a plan to adjust my audio system for creating surround stereo using the digital processors. Also, I want to adjust the multi-way speaker system. I look forward to use DSSF3 to measure distortion, that was adjusted by ears previously. Finally, I want to step into the field of room acoustics.
I purchased your program for measuring an instrument sound, which I intend to construct by a metal pipe. Also I'm wondering whether I can investigate the emotional aspects of human voice, using your software. I'd appreciate if you could give me any idea about this.
I want to use DSSF3 in measuring low frequency noise. It would be nice to be able to measure low frequency noise using the standard G-weighting function.
I will use DSSF3 for adjusting the crossover network in my car audio system, time alignment, and measuring its frequency response. 
1. Purpose of use
I'm measuring the noise level in the factory. Previously I was using standalone equipments, such as the sound level meter, sound level recorder, data recorder, etc. It was inconvenient to bring all the equipments to the measurement site, and I was looking for a PC based measurement system (e.g. laptop PC + USB interface + level meter). My requirement to the software was to store the 1/3 octave analysis data with the standard time constant setting (Fast/Slow). 

2. Impression
DSSF3's Realtime Analyzer is very easy to use. Oscilloscope and spectrum analyzer are also helpful. I can check the equipment using the oscilloscope, and I can investigate the resonance frequency by the spectrum. Signal generator may be convenient too. I will let you know comments to other functions after I use them. 

I'm using your program for a set up of PA systems. It would be nice if I can delay one channel input, because I want to compare the microphone input with the system's line-out. But basically I'm satisfied with the program. My equipment is as follows. PC: Gateway Solo3400, Interface: ESI Waveterminal U2A, Microphone: Behringer ECM8000
We are a company that sell audio visual equipments. Our projects includes design and construction of broadcasting studios, postproduction studios, recording studios, and educational audio visual equipments. So, we always need to measure the audio signal and adjust the equipments. We are using DSSF3 Light mainly as a test signal generator and as a phase monitor. In the future, we want to use this tool for a set-up of the electro acoustic systems in concert halls the auditoria.

Thank you for your support. I recorded a human voice using the digital video, and measured its spectrum by DSSF3's FFT analyzer. It is a great software. I will purchase a measurement microphone and will learn more how to measure voice. 

I am using DSSF3 for measuring environmental noise in the exam hall. Because the opportunity of such a field measurement is getting increased, I purchased one more license of DSSF3 for my laptop PC. I am happy that the spectrogram mode had been added to the FFT analyzer. DSSF3's real-time display is very powerful, so it is very effective for research and education. 
Since a several years ago, I have been using RAL for measuring a self-built speaker system. Now I'm using DSSF3. From these experiences, I realized that it is impossible to obtain good sound without the measurement system. I had been adjusting my audio system by only using ears, but it was a terrible acoustic condition. I could not bear to listen to its sound more than a couple of hours. After adjusting the level balance, frequency response, and phase, using DSSF3, the same system revived. Now I can listen to music during a whole day without feeling any stress. This wonderful situation should not have been achieved without your RAL and DSSF3 programs. On my website, I'm publishing my information about audio measurement. I'm happy if it helps users of your products. 

URL http://www7a.biglobe.ne.jp/~t-toyo (note that this site is written in Japanese)

We are using DSSF3 Realtime Analyzer for measuring the acoustical qualities of some materials for the purpose of the developement of a new sound insulator. I tried many software but your DSSF3 was the best in ease of use and measurement capability. It would be nicer if it has the arbitrary waveform generator and its sequential control. Thank you.
I purchased RAE software for monitoring noise from upstairs of my apartment. My neighbor's noise is a very loud impulsive sound, and it disturbs me in the midnight. But it is difficult to explain this situation to other people, because the noise is highly subjective and it doesn't occur every time. I looked for a device to record the noise and found your website. I think that the decibel graph, which the software can create, will be a clear evidence of noise. 

I'm a researcher at the architectural department of University. I purchased DSSF3 Full-system for measuring the impulse response in concert halls. I'm mainly using the software on the laptop computer.
Your software was recommended from my friend. I think this is a good tool for audio measurement. One of my purpose of use is to investigate the frequency responses of the speaker units. I have a 4-way speaker system. Another purpose is to adjust the channel divider's delay, by emitting the periodical pulses (width of 0.5 ms and interval of 60 ms or so) and measuring each unit's output. 
I purchased DSSF3 Light. I will use the oscilloscope for measuring the rush current of a DC motor, for diagnosing failure accidents of equipments by the acoustic analysis, and for measuring the electric wave of industrial telecontrol systems.
We are a developer of automobile audio visual products. We purchased DSSF3 Environmental noise for measuring the acoustic qualities inside the car, and the noise while the car is running. 
I purchased DSSF3 Light. I want to analyze the singing voice for investigating the effect of voice training. My concern is how much the voice range will extend and how much the voice level will increase. 
I will use DSSF3 Light for measuring the performance of my car audio system. I hope I can adjust the system installation by use of the measurement results.
I'm doing a research project on the noise silencer. I will use DSSF3 for measuring the noise level to investigate the effect of the silencer at the end of an air conditioner duct. 
I'm working at a company that sell the audio visual system. I was looking for a product that can measure the sound level easily for evaluating the quality of TV conference system. I'm using DSSF3 for measuring the sound pressure level in a room. 
Thank you for your support. I'm using DSSF3 Full-system for tuning of listening rooms. Realtime Analyzer and Sound Analyzer are indispensable tool in my work. Some data can be found in my website. 

http://www.salogic.com/home-select.files/home-s-sub.htm (note that the site is written in Japanese)
I'm doing the frequency analysis of lung sound, captured by Littman electronic stethoscope. 
I'm working in the electronic technology department. I will use DSSF3 Full-system for investigating the 1/f fluctuation of various sounds.
In the department of Dentistry, oral hygiene course, we are planning to analyze the swallowing sound. Our equipments are: stethoscope (Littman, for infant auscultation), lavalier condenser microphone (audio technica AT805F), and DAT recorder (SONY TCD-D100). We inserted the microphone into the stethoscope tube as in your website, for recording the auscultation sound. 
I will use your software for analyzing sounds of musical instruments.
I think DSSF3 is a very convenient tool for measuring acoustics in auditoria and meeting rooms. It would be nicer if I could measure STI (speech transmission index) in the Light version, but perhaps it is beyond the scope of Light version. I will consider upgrade to the higher versions.
I will have an acoustics course in my University. I will use Realtime Analyzer and Sound Analyzer for demonstrating how to perform the acoustic measurements.

I purchased RAE for adjusting my speaker system. I'm mainly using spectrum and 1/3 octave analysis. It would be nice if it allows full screen display.
I'm working as a noise and vibration consultant. I use your software for analyzing the recorded sound by the spectrum and 1/3 octave analysis. 
I'm using RAL on the Pentium4 desktop and Toshiba Libretto laptop. Purpose of use is to check the waveform by the oscilloscope and the FFT analyzer. Though I own the high grade measurement instruments in my company, RAL is very convenient for seeing signals quickly. My request to your software is as follows.
I'm using RAE for the acoustic measurement of a concert hall and for controlling the howling.
I purchased RAL two years ago, and now purchased DSSF3 for a new computer. My equipments are as follows. PC: JVC, InterLink MP-XP7310, Microphone: Behringer ECM8000, Audio interface: EDIROL UA-25. 
I use your software for adjusting the equalizer settings in concert halls, for measuring crossover network of the speaker system, and for measuring the sound field inside the car. 

My equipments are as follows. PC: IBM ThinkPad 240, Soundcard: YAMAHA UW10 (USB), Mic: Behringer ECM8000, Mic mixer: Behringer UB802. ECM8000 has a very flat frequency response and it seems no compensation is needed. 

Your software is very convenient because I can use the analyzer and the signal generator at the same time. Price is also good. 

The software is used in the Aero engine Testing Technology Center, Institute of Space Technology and Aeronautics. Purpose of use is to measure the absorption coefficient of a newly developed absorber panel in the reverberation room. I think the software is useful and effective. Measurement time was very short. 
I'm using RAL for investigating the sound qualities of my bamboo flute. Some measurement results are on my website.

-Power spectrum analysis of bamboo flute
-Does flute sound have 1/f fluctuation?
(Note that the website is written in Japanese)

I think many other instrument makers are interested in this kind of acoustic analysis. RAL is a good software for those users, because of various measurement features, ease of use, and superior cost performance. However, some knowledge of the acoustic engineering is needed to use this software. It would be very nice if you could provide some basic background information about acoustics for beginners, in your website or as a help file of the program. 

I am an audiophile. I use your software for adjusting my audio system, of course. My primary concern is the impulse response. The frequency response alone did not give me a better result. I think the phase response is more important for a good sound. I want your software to have a "data printout", as SpectraSOFT has.
I have been disturbed by the low frequency noise for a long time. So I looked for some software to measure the frequency of sound. Your software allowed me to identify the low frequency peaks at 50 Hz, 100 Hz, and 200 Hz. Thank you for providing such a nice software. I will have one more copy for my company for using the oscilloscope. 
I'm using your software in concert halls for a setup of PA systems. This is a very reliable and convenient software. When I use the software, other engineers are interested in it.
Here is my comment. RAL is very low cost, but is very nice tool for audiophiles like me. Careful adjustment, including the room acoustics, is important for the audio system. But many audiophiles are adjusting their system by ears, because they can't afford to buy the expensive FET analyzer. RAL would be very helpful for these people. However, we can't use it practically if the quality of the soundcard is not good. In my laptop computer, the microphone input attenuates above 7 kHz and the headphone output attenuates above 10 kHz. To solve the problem, I purchased a USB audio interface. It gave a flat frequency response up to 20 kHz, that is enough in the audio measurement. I'm publishing this experiment in my website. Have a look at it if you like. http://www2s.biglobe.ne.jp/~yapsys/ (Note that the site is written in Japanese)

We will use your program (RAL) to look at the frequency response of OEM radios - mainly to decode DSP and time delay.
Congratulations on producing such an excellent product.

I will be using RAL largely for personal use, but also I am teaching some students about telecommunications. I need to show them that sound is composed of waves - using the oscilloscope. I then need to show them that human speech occupies a particular range of frequencies - using the analyzer function. Finally I want to show the students that the range of human hearing is about 20 - 20,000 Hz using the signal generator.

I would ideally like to be able to simulate the effect of a band pass filter on speech - do you do any products which would allow me to do that?

I have installed the RAL software on a Sony Vaio notebook and expect to use it for power spectrum/third octave analysis in vehicles for 3 purposes: 1. educational purpose 2. audio system tweaking /vehicle acoustic compensation 3. some data archiving.

I still need to order the mic and preamp (Behringer and ART). The sound card will come from Best Buy (Creative Audigy 2 ZS Notebook). I will do my best to give you any feedback that I think might be helpful or useful for either one of us concerning the software.

I intend to use this software (DSSF3 Light) to assist me in teaching a course in the Science of Music. I needed to show many concepts that your software could demonstrate. I chose "light" due to budget limitations but as far as I can tell, it is sufficient. I am still exploring the software to fully understand what it can do. (Your price is very reasonable compared to other packages that I have looked at.

One thing that I find that it cannot do is provide a cursor in the "sonogram" mode. This would make picking out frequencies easier. I would also be nice to be able to show the frequency spectrum at any time in the sonogram. This would be helpful for showing the resonances in the human voice.

It would also be nice (and perhaps I missed this) to be able to collect the frequency spectrum AND the sonogram at the same time and be able to switch back and forth between the views.

I also purchased your library program to store results but it does seem like the capability should be built directly into the package. Simple save (as jpeg or as excel, etc.) would be very valuable as well as a simple FILE > PRINT command that most software packages contain.

I am planning to develop a laboratory course next year for the same subject. Do you offer any discounts or site licenses for educational applications?

We are interested in using this software (DSSF3 Environmental Noise) to calibrate sound systems. 
We are an acoustical consulting firm specialized in high technology. We would like to use your program  (DSSF3 Environmental Noise) for low frequency vibration as well as airborne sound. Would you consider modifications to extend the low frequency response of the FFT analyzer, and 1/3 octave analyzer? Is it possible to overlay criteria curves on octave band graphs?
I am an engineer working for a company making micro fuel cells. We need to perform a 1/3 octave analysis on our system to ensure that it conforms to noise requirements. As I use the software, if I can identify any possible improvements, I will let you know.
I am a radar system applications engineer. I am using your software to analyze the Doppler IF signals from microwave transceivers at 24.125 GHz. These signals are typically 72 Hz / mph of target velocity towards or away from the radar head. Thus we usually have an IF signal frequency of between 10 and 10,000 Hz. Since this is "audio frequency" for sound engineers I am trying this software to evaluate it for our application. You may find a lot of interest from other radar manufacturers in the UK and USA as I tell them about my results.
Thanks for sending us the registration key for the RAL software. I was really impressed by the trial versions of the software; RAL is well-suited for my needs and very good value for money. You asked for our purpose for using the software so here goes!

Eminox are a company that designs and manufactures exhaust systems for the truck, bus and off-road market, mostly diesel engines. I work in the research and development department and keeping exhaust noise down is one of my responsibilities! We have a dedicated system already for noise measurement but I liked RAL since it allows me to create a FFT or 1/3 octave spectrum from a sound file. Sometimes we only get sound files of exhaust noise from customers so it is then useful to get a spectrum.

I might also use the signal generator function to test exhaust systems using a loudspeaker test rig instead of an engine!
I am very happy using Your DSSF3 software! Price / performance is the best I found so far! One feature which would make it almost perfect would be a frequency response measurement capability. This could be done for example with the swept sine wave generator and the level measurement. Even more perfect, if the sine sweep could be synchronized with the FFT (higher dynamic range than with broadband level measurement).
My intent for this software is purely educational. I am an EE major at Mississippi State University, and the use of the Realtime Analyzer is critical in our ongoing efforts to study the various aspects of sound waves. In my electronic circuits class, we heavily study the sinusoidal wave forms, as you might guess. Thanks so much for the use of this software.
Great software!
Purpose of purchase: Using to analysis/compare the sound source character especially from musical instruments. 
I downloaded the program last year, as a trial, and was very pleased with
it. It is an excellent product.

I now want to do some work investigating the acoustics of the American banjo (a hybrid of a shamizen and an IBM PC). The banjo instrument has many adjustment possibilities (such as the tension in the head, type of bridge, angle of strings over the bridge, type of strings etc). I want to see how the sound spectrum varies with different adjustments and changes and also look at impulse response or white noise testing to discover resonance in different parts of the instrument. I have already found some work on this. If you are interested, have a look at:


I am a private individual, living in the UK, a retired electronics engineer who plays the banjo for fun, and I need a project to keep me busy :)

If I have any comments to make on RAL, I will email these to you. If you would like further information, please let me know.
I am an audio engineer. I use RAL for my work in live concert sound, the FFT
Analyzer. I am currently on a US tour doing the monitors for the Tyler Perry
Show " Meet The Browns". We have been on tour since Jan. 2nd 2005 and will
finish this leg of the tour 2nd week in May 2005.

I like your software very munch.

I just downloaded and am trying your RA software (DSSF3). It has a 30 day demo license. I like it also very much. I tried it tonight for this evenings
performance. I like the spectrogram part of the software. I am thinking of
buying it.
I have always been interested in analyzing and measuring sound. RAL is the first program that I could afford that was good enough to really use. I am very impressed with the program so far. My current need for the program is to test the sound at a local church. They are getting allot of feedback. Someone already tried to setup the system, but didn't do a very good job. I installed the RAL program on a Compaq Presario notebook computer , but I
think I need a better notebook computer or sound board. This computer seems to have allot of low end noise. I work for myself selling computers and electronics. I know people around here that work in sound that could benefit from your program. I will demonstrate my RAL to them and maybe they will like it enough buy the DSSF3.
The purpose is to show children how amplitude is different from pitch and to give them the opportunity to make the sounds themselves, using instruments or their voices. I intend to use this with a laptop and a projector.
I'm a hobbyist developing microcontroller-based telemetry encoders. My current project generates audio frequency shift keying signals in software, and a new version in development will use phase shift keying. I find the frequency analyzer to be very useful for verifying that the device is generating signals as it should, and to determine the levels of harmonics generated by aliasing in the digital to analog conversion. My project website is at http://n1vg.net/opentracker.
Thank you for the key - it works fine. I work for an electronics company that operates in the pro and mobile audio fields. It's a Taiwan-based company but most R&D is in Europe. I am English and work in the UK office. I am product manager of the mobile (car audio) division. We have a range of digital signal processors and I intend to use RAD as one of my aids during seminars and training of car audio installers and our distributors etc. It should help me to demonstrate many of the features. This is the main use I expect to have for the software.
I am using RAL to analyze the frequency characteristics of live recordings of achoir in a theatre, recorded with the choir at different locations, e.g. in the back of the stage, in the front of the stage, at the same level with the audience etc.. I need more information on the differences that I hear, e.g. which frequency bands differ between the various recordings. I could probably finish the job within the 30-day trial period, but the program has been very useful already, so I decided to buy it, although I don't know how much I will use it in the future. As far as I can see now, a useful addition would be: - in the FFT Analyzer, save (freeze) an intermediate peak hold situation in a different color on the screen (to compare the peaks of two recordings)
I would like to use this software to conduct noise measurements.
The software is working correctly and is very useful.
Currently I’m using the program for doing measurements on an old tube amplifier. I’m trying to upgrade and improve the amplifier with new and better components. The audio output is not linear at the moment but has improved quite well also thanks to ‘RAL version’. I’m using this software as generator and I use the FFT analyzer and I’m quite amazed how well it works!...

I think this software, even though it’s one of the most basic versions, turns my pc in a very useful tool to measure all kinds of amplifying circuits. I’ve compared RAL to other software available on the internet but I couldn’t find one that was so user friendly and easy to work with.

One thing though I was ‘missing’ is a way to calibrate the input of my soundcard. There is a way to calibrate a microphone but it would be nice to be able to calibrate the line input of the soundcard as well to eliminate any influence from elements in the measuring circuit that may cause non-linearity.

All in all, excellent software!
Currently we are using your software to do a simple test of a digital audio interface, using a digital audio PCI card Delta DIO by M-Audio. With your software I can put in different waveforms and measure the output. What we would really like to have is a windows application that can do a bit-test that way we can verify a digital audio SPDIF interface in our manufacturing environment. Basically it could output a waveform (sine, square, etc.), walking ones, or random data and compare with data read back. It would also be nice if it could log test results.
I gonna use the program to measure my loudspeakers and my new developed audio amplifier. Also I have a question for you, are there gonna be a printing option in the program for printing the measured results?
I am using this program for calibrating my home theatre system, mainly.
I use RAL for live monitoring my sound input. I use an M-Audio Delta 2496 soundcard. I also use a small Eurorack Behringer mixer and Rode stereo microphone. I like to see what frequencies being used in a fast and polite way. I especially like the waterfall view. I do not think it is smart to make a new graphic interface witch use a lot of CPU power, because I use RAL together with many other programs. Renoise, Cubase and Cool Edit pro/Audition. If possible then make the program use less CPU power. But I think it's very good now too.

I have one idea around two channel view. When selecting to view two channels then show two waterfall areas instead of two graph lines upon each other like it's now. Sometimes it's pretty hard to separate them with the eye. That would be pretty cool.

I like this software for my use and my needs, except I have to ask for a new registration number every time I reinstall my computer... but its of course cosy to write e-mails. :)
David My company produces computer-based presentations related to management of noise in the environment. We are currently working on a project for the Navy. We are using a high quality sound system to produce the sounds of weapons firing. We know the speakers can not produce the very lowest frequencies. We have used your software to compare the "true" frequency spectrum (from digital recordings that we made) to the frequency spectrum that is heard through the sound system.

Both your software and our sound system work fine.
I am looking for FFT Analyzer Software and pricing, to be used on either on laptop PCs using Win98, WinNT or Win2000 Professional or via PCMCIA interface. I have various calibrated microphones and Sound Level Meters. Thank you for information.
Nishigandh We appreciate your contribution for bringing out innovations in latest Technology Products. Here we also take this opportunity to introduce ourselves as providers of high quality and cost effective products and services in the emerging areas like PCI Express tools, USB and 1394 Bus Analyzers. You can also get more information about our product range from our website http://www.nital.com Full featured product downloadables are placed on our site. Since many other technology players in the areas of USB related development are using our analyzers, we have taken a decision to extend its reach in the market to maximum.
Scionics is a consulting firm specializing in the design of digital infrastructure audio/video/control networks in addition to low-noise HVAC, balanced electrical power systems and acoustical treatment.
I really like this program... I have used it for 3 days. It is very easy to use, just like the hardware stuff. I build electronic circuits and speaker cabinets to make my guitar sound good. There is a ton to understand about my rig in order to get it how I want it. That's where your software comes i changes in envelope. One thing I plan to use it for ... That I am not sure about yet... Is to acoustically find damping factors for my speaker cabinet, and at what frequency. I would like to have some resonance, but I'm not totally sure at what frequency and at what damping level. I'm imagining creating a dampening curve, even if I have to use graph paper!!! (dampening vs. frequency) Having a record function would be sweet! guitars are definitely different than hi- fi, so often you have to do the research yourself! So! Is that helpful at all?

It is a really great piece of software! Thanks!
The purpose of use of the DSSF3 software is analyzing audio equipment, specially switch mode amplifiers which we develop. Further it will be used in loudspeaker measurement. The audio interface we use is the FireWire410 of M-Audio.
We use RAE for the measurement of dummy head's impulse responses in the anechoic chamber. However, there is some problem for the measurement. As you know, for the measurement of dummy head’s impulse responses, we need to measure both of ears. But when we are trying to measure in same condition, the time interval between left and right ear’s measurement result changes. I mean the ITD (Interaural Time Difference) changes. So, we tried many times to get reasonable results. Could you give a advice for the measurement of dummy head’s impulse measurement?
I was interested in purchasing an audio spectrum analyzer for use in analyzing the acoustics of audio workstation and mixing bays. I was very happy to find I could use my laptop rather than purchase dedicated expensive hardware. Many of my clients are interested in achieving the flattest response possible to enhance their audio mixing experience. The built-in audio tone/noise generator will allow me to create test signals and identify problem frequencies in their rooms and in their equipment. I will also use it in my home studio and for a school project on sound waves that my daughter will be doing for school.
To analyze sound in a new gymnasium
I downloaded the Acoustic Analyzing System 5E demo and have been reviewing it. I am very impressed! This program is well-written and offers a broad range of acoustic analysis tools.
I am using the software for Air Conditioner Noise measurement.
I will be using your software to test custom subwoofer enclosures for home and automobile applications. It will also be used for final adjustments of completed sound system installations. I have been playing with it for a couple of days now while tuning a subwoofer cabinet and your software has made the task far easier than hooking up the different generators and processors I normally use. Your software easily replaces thousands of dollars in equipment and cables
Thank you for offering such a powerful signal analyzer system for only US$24. I am a self-employed audio engineer and technician. I will use RAL for repairing and designing professional audio components.
I recently purchased some speakers and noticed it did not sound good with a tone input at about 250Hz. I am using the spectrum analyzer and signal source to look at this more closely. I see a peak hold function that is not active in this program version. It would be useful for doing a frequency sweep.
We need to make an instrument for an event called science olympiad. We're making a set of chimes out of metal-electrical conduit. So we are using the program to cut them to size and tune them.
Thank you for the registration, it appears to have activated my software on my laptop again! I think I can use it now!

Main reason that I've been wanting a program like yours, is that I am an acoustics engineer at G, where we package gas turbine generator sets. I'm in the design engineering group, and I occasionally receive sound samples from e-mail, from field technicians, that are recorded with digital cameras, laptops with microphones, or other electronic instrumentation systems that have audio recording and digitizing capabilities.

They email me the sound files of things that don't sound right, or are really noisy. Most of the time they are trying to get a diagnosis on something that is not working right. This way they can send me the strange sounds they are hearing, during the operation of a machine, and I can now analyze them! Your real-time analyzer program (RAL) lets me identify frequencies of sounds -- also if they send me vibration data, I can do the same thing, also to identify frequencies.

It is very helpful, because I can take any audio file, such as an mpeg file, wav file, or movie file with sound, that someone has e-mailed to me, and I can play it back, then use the "MIXER" as input to the program, to do a frequency analysis. I understand that this is not a calibrated level measurement, but frequency peaks can still be readily identified. The frequency peaks can be readily traced to specific equipment items, such as turbine blade pass frequency, gear tooth mesh frequency, fan blade pass frequencies, etc. so it is a very helpful tool to identify sources of noise problems, without having to actually go to site and do the testing myself. (it's not a substitute for personal visit, but many times, the problem can be identified by simple sound recordings, such as I have listed.)

I am very enthusiastic about your software -- My job is noise control, so I get to do a lot of noise analysis. Your higher-level programs look very interesting , but usually, I like to use a dedicated piece of hardware, for the high-end, precision sound and vibration level analysis, because I don't have a good way of validating, per ISO calibration procedures, the accuracy of typical PC's and sound cards. PLUS, dedicated, portable machinery for noise analysis typically uses RAM memory for data storage -- no hard drives to crash, and CMOS-RAM can be held secure via lithium battery supply, internally (example: I use an HP3569A for almost all of my work in field measurement (Hewlett-Packard)).

Your software is the first one that I've seen, that does FFT analysis on a PC for cheap! I've been waiting for about 10 yrs, for somebody to do what you have done, where a PC can be used as a multi-purpose signal generator, analyzer, and oscilloscope -- I was thinking that it should be possible for a reasonable price, and you (or your company) are (is) the first to have done it cheaply, as far as I have been able to see!


I realize that your RAL software is the "Lite" version, so it's not intended to have all of the features of the much more expensive software that you offer. However, I would like to identify ways in which I think your RAL software could be improved.

1) Need Some way to store or "Save" the Analyzer trace information, as numbers -- i.e. output to x-y clipboard entity, or data file (Level vs frequency), such that the information could be imported, or "Pasted" into Excel. That way, it can be graphed or manipulated as numbers, any way desired, in Excel. Screen copy and paste is the only way to save trace information right now, and that is limited in what you can see.

2) Expanding Analyzer display window to full-window -- is not very useful, the way it is -- when I pick the full window icon in the upper right corner of the display, if I have trace information shown in the small window, when I expand it to the full window, the trace is cleared out -- therefore I can't make a full-size view without restarting the analyzer -- other problem is that the "Start" button cannot be touched, when the analyzer display is in the Expanded Window mode. In other words, to get a expanded-screen trace, I have to first start the analyzer in the reduced screen mode, then while it is sampling, go to expanded screen. But then, I can't see the frequency and level display, to move the cross-hairs, for identifying tones! Therefore, full-screen mode is not much use, even though abilities for identifying frequencies could be much better, with the Expanded screen display -- This is very Frustrating! Especially when there is no other way to store the trace! I think this program is very useful, and a great bargain, but that small feature malfunction is greatly limiting to the program's usefulness! (It should be easy to fix!)

3) Sometimes the program can crash, when adjusting Frequency Limits -- When I was in narrow-band mode, I found that if I adjusted the upper frequency limit of the plot, that the program would sometimes "Crash", which means it would stop functioning, and I would have to close the program using windows "Task Manager" then I would have to restart the program. This was not too much of a problem, since the program does not store data, anyway, so no data is lost, but it can be frustrating. I noticed that if I wiped out all of the numbers in the upper frequency limit, prior to entering in the new upper frequency limit number, that it would crash before I could enter in the new number. This is probably a memory register problem, as it is apparently adjusting the frequency as it is being typed in. You should probably have it set up to retain the previous number, until a new number is entered in. Also, you should have an error handling routine, to check to see if the new number entry is a valid one, before swapping the new number for the previous number. This way, you may be able to prevent crashing the program. That's about all the time I have for now, But I am very happy with the value of the software you have here, for only $26.44 ($-yen conversion isn't as favorable as it used to be, when you advertised for $24.00!) But in any case, I am very happy with it, I just wish the Expanded screen view was more controllable. Other than that, I think it is well worth the money!
Purpose of Use: Real Time Analysis - tuning equalizer in car stereo
Application: Use DSSF3 for loudspeaker measurements -Amplitude characteristics as function of frequency -Try to use it for loudspeaker impedance measurements.

One question yet: I selected DSSF3 Light because the peak hold function is included. I put the serial number in the program, but nothing changed to the peak hold function. It remains disabled. Should I get an update ???

Thanks again for you support during installing DSSF3. I tried the user registration number, and it works now!
Thanks for that. Certainly, I'm happy to tell you why I wanted it. I am a professional acoustic engineer, hence my interest in sound analysis, although I wanted the program for private home use. I have good hardware and software at the office, of course, but I wanted a good program at home for my own personal interest. Specifically, I am a student of the Shakuhachi, and I am fascinated by the acoustics of the instrument. Some of the acoustic physics is described on http://www.phys.unsw.edu.au/~jw/shakuhachiresults.html and http://www.navaching.com/shaku/shakuindex.html

I already had the free download program TUNER_E.EXE from http://www1.ocn.ne.jp/~tuner/tuner_e.html which is very powerful for what it is, but since I am an acoustic engineer I wanted more than it offers. I also enjoy making my own shakuhachi from PVC pipe, as described on http://www.navaching.com/shaku/shakuindex.html and also on http://www1.ocn.ne.jp/~tuner/esyaku8.html

I plan to make my own bamboo shakuhachi someday.
We are planning to use this program to study problems of noise in our factories. In our first example, we would like to study the frequency spectrum produced by different types of burners and use this information to design burners that are more quiet. Your program is simple to use has many useful analytical tools. I have two suggestions for improvements so far:

1) Would it be possible to provide a feature where you can sample the FFT spectrum of the current noise level, then subtract that spectrum from future measurements to show the differences? It would make it easier to identify specific sound changes as different events occur.

2) Could I export the data on the FFT screen to a text file so that I can do further numeric processing on the output?

Thank you for producing this program.
Marion  As my first use of this system, I plan to use the system installed on my IBM laptop to do some demonstrations for electrical and computer engineering students at Mississippi State University.
My purpose of use is home audio. I will use it to set an 11-band equalize on powered subwoofers.
Jim I used to be an audio engineer and later a acoustics and vibration engineer, so I find your software fascinating. These days, I create 3D immersive worlds for the web, using Adobe Atmosphere as a form of art or hobby. Your test gear will help me with the audio in these 3D worlds and also to sample the characteristics of real sounds which i wish to simulate. I wish I could afford your full program, as I have several ideas for recording the data stream your next version(s) will supply and for using those to drive 3D scenes programmatically - but it is only a hobby, so I must be happy with the lite version.

Thanks for a very fine (amazing in fact) product!

My lifelong interests are both art and technology. My college degree is in fine art photography and my careers have been in audio engineering, acoustics and vibration engineering and personal computers. Currently, my one-person business is personal computer consulting (small system design, installation, networking, training, etc.) and web work (planning, building and marketing web sites). Currently my art work is beta testing, developing and publishing 3D immersive, web-based, photorealistic "worlds", using the just released (November 19, 2003) Adobe Atmosphere. I have been a top beta tester of Atmosphere for 3 years: http://www.adobe.com/products/atmosphere/main.html My first use of your trial version was to test and calibrate the SoundBlaster Live system on my production PC. I had just upgraded from Windows 2000 Pro to Windows XP Pro. Audio seemed fine in XP, with casual listening, but your program showed that distortion was rather high and headroom was very limited! After installing new Creative Labs drivers for XP, my audio response was excellent. Without your program, I would not have known there was a problem. I then recorded a 700Hz sine wave of 1 minute length as a .wav file and published that as an ambient sound in an Adobe Atmosphere world on my web server and analyzed the response through the Adobe Atmosphere player (a plug in for Microsoft Internet Explorer). The results were excellent and I was able to send your screen shots to the audio developer on the Adobe Atmosphere development team. He was very excited about these results. In future, I see 4 uses for your software with Adobe Atmosphere:

1. Further testing of "inworld" audio qualities.

2. Characterizing real sounds, to help with simulating them realistically in Adobe Atmosphere.

3. Characterizing and simulating room acoustics in Atmosphere.

4. I am developing a concept I have imagined for using the audio system of Atmosphere as a "control channel" to store complex signals that would be used to drive various geometric objects, their physical behavior and audio/visual effects in Atmosphere environments.

Atmosphere incorporates the Havox Physics Engine and is programmable through JavaScript. Therefore, if a peak detector or RMS filter were added to the audio system of Atmosphere, a music signal or periodic data stream (like historical stock market data, etc.) could be applied to one of the sound channels and used as a simple amplitude control signal to drive JS programming to drive the Atmosphere scene. Atmosphere provides for multiple sound objects in .wav, .MP3 and .cel formats, so several sounds and also several such control channels are possible at the same time, subject to Internet and processor limitations. In other words, the current audio system of Atmosphere could be adapted for scientific or business visualization purposes or for music visualizations. I am currently working on this idea and will try to interest the Adobe developers in adding it to the next version of the product. At this time, Atmosphere version 1.0 has the ability to use simple, built-in JS repetitive ramp or Boolean square wave generators to control objects and effects, but has no method to allow the input of outside control signals (except audio files). This work is just my hobby, so there are no funds for development. Therefore, I am very glad that you offer a "Light" version of your wonderful programs and that you also offer incremental upgrade prices.
My purpose is to keep my digital recording studio sounding good.  The biggest plan is to check EQ using the realtime analyzer. Thanks you very much.
I use RAL for only one purpose. Using the RAL signal generator I input (usually a sinusoidal wave) the signal into the receptor end of stethoscopes, and then using the RAL oscilloscope I verify that the signal is output through the earpieces.
I am using RAL as a spectrum analyzer to set up my Tascam 688 8 track cassette recorder. The unit is very old, mid to late 80s, so I am interested in knowing how it performs. As far as improving RAL I could not find a way to print or store wave forms.
I am a registered user of your, excellent, PAL program. I am using the version 1.01. The computer which has the program installed, is not connected to the Internet. Is there a way to get an upgrade to the new version, 2.0, other than clicking the update button on the present program. Is there a way to download the version 2.0 on a different computer than the one that has the program installed...
Recently I found your dssf3 environmental noise measurement program.

As I’m living in a local community that suffers serious annoying aircraft noise, since the 20thFebruary 2003, we are very interested in your program. We would like to consider your program to take noise measurements around our community in order to convince other people and the government that we have a serious sleeping problem.

The db(A) measurement capability of your program is excellent!, I've found it to be very easy and accurate to set the level of the db(A) indicator to the correct level. Also the source ‘fingerprint’ detection algorithm seems to work efficient, especially in combination with the option to check for the correctness of the source of the noise ‘using our own ears’. .

One of the things we would like to do but that can’t be done now is automatic publishing the information to the internet in order to make other people aware of our problem.
We would like to ask you whether you would consider to add the following features to the environmental noise measurement program:

- taking a 24 hour time/db(A) graph;

- storing captured audio in mp3 format on order to make the audio available over the internet. 

- adding a kind of internet publishing option, at least the option of:

We think that the features as indicated above would not only help the people in our own area sending their ‘emergency’ messages across the country, but would be helping also all people around the world that are living near airports and suffer form aircraft noise during night and day, as we do. It could be helpful, as part of other means, to persuade governments all over the world to put all efforts in diminishing the air craft noise annoyances near the air ports.

Please let me know if you would consider adding one or more of the features mentioned above. We would be very glad to be a beta-tester, if needed. 

Just to give you a rough idea: In our very local community there are living about 35.000 people. Within the past 6 months about 1000 people are organized in a still strongly growing local protest-association. See also www.vlieghinder.nl . In total there are roughly 2.500.000 people in the Amsterdam airport area that are suffering from aircraft noise annoyance. Our area is a small area with ‘preferred’ and locally concentrated day and night air traffic. They fly at a height of only 2000 feet at a distance of only 25 kms from the runway….

I am using this software for sound system calibration.  I use the Impulse Analyzer to determine near field response and timings.  Then use the Impulse Analyzer and Waterfall Analysis to determine problem frequencies in the room.  I also use the FFT for ringing out the system and then use my ears to accomplish only what ears can do....make it sound good sonicly not just technically.  I also record the sound in the room and run it through the Sound Analyzer RAD and look for odd resonances or other issues. Thank you and you have a good value and product here.
I have a rather unique use for RAL that I'm quite proud of "inventing". To help prototype a new type of transmitter and receiver, I generate <audio> signals in place of RF. I use RAL to verify that this advanced new form of QPSK modulation works properly, examine the spectra, and even get to view constellation plots, thanks to the X-Y mode on the oscilloscope. Prototyping this way lets me actually build functional transmitter and receiver code that runs on a normal PC without any additional hardware! What is even cooler is that I can generate signal impairments such as white noise or impulse noise, measure SNR performance and BER performance, and all without having to deal with RF! This is an exciting application of RAL, and it really is a nearly-perfect tool for the job. If I had only a single wish, it would be that you'd add so-called "eye diagrams"!

Thank you very much for such an outstanding tool!
We use the program in our Physics of Music Laboratory to do frequency decomposition exercises on various sounds. We are pleased overall with the program, although some of the teaching assistants have said it would be nice if you could print from the program.
We need to analyze the auditorium of our church, in Guilderland, New York, USA.  Which of your software products would allow me to analyze the amount of reverb in our auditorium?  I'd like to use that as a bench-mark so that as we add sound deadening material we could tell when we've reached the right amount or placement.

We have a tight budget so I'd like to be able to buy software that would help me analyze the acoustics of a room, but if possible, it doesn't need to do anything else.
We had gone through your product. Our application is to monitor sound of Motors to predict motor healthiness. Our sensor (sound pick-up, Magnetic) will be connected to sound card of IBM Laptop. 

Pl. suggest which of your product will be suitable for this application.

Pl. let us know, if you have any local representative (INDIA) for dealing

Donovan I had a problem with computer #2-- because it's connected to the main server, at the College of New Caledonia in Prince George, B.C. The IP address is constantly changing-- that also changes the hardkey # every time the computer is turned on. I'm hoping to get another laptop to install the RAL software on it I am currently finishing my second and final year in Electronics Technology Engineering program at the above mentioned College. I am using the RAL software in my final project on Bearing Analysis using an accelerometer as the input and the software for the analysis. The analysis is being done on the lower frequencies-- which will display the frequencies generated from the bearing. 
We will be using it for a theater application, digital sound application for concerts and Broadway shows. nice price!
Christoph Thank you very much for sending me my registration number so fast. You asked for my purpose of use. I'm studying physics at the university of zurich and i'm working as a teacher sometimes (8th and 9th class). This are the main topics, I'm going to use your prog for.
I will be using it to complete the design of a new 5.1, & 7.1 surround sound speaker system. I am tired of going to the stereo store and listening to mostly JUNK and hearing them called speakers. Have completed the concept set, but still minor tuning to do using your software before releasing the public version.. Have had public listening tests and received responses such as awesome, great full sound, realistic, etc (they don't sound like a point source). The front speakers have a sensitivity of approx 101 db @ 1W/1M (rated @ 125W RMS), the center and surrounds of approx. 98 db (rated @ 100W RMS), the powered (1100 watts RMS) subwoofer of approx. 96 db (rated @ 260W RMS). The highs have brilliance (using a horn), the mids have presence (using 6" cones in phase), and the lows viabrate the room, this is at approx 1/2 watt avg on all but subwoofer, sub at this setting is hitting approx. 100 watt peaks. The speaker line will be from my speaker company "Acro Acoustics", the model of this sytem will be "Surround 6D" (for 5.1) and "Surround 6T" (for 7.1). The company address is Acro Acoustics - P.O. Box 32 - Victoria, Ms - 38679 - USA. Phone # 1-662-838-8091. This is a small startup company just beginning its initial design stages. I am working in close conjunction with Eminence and Guitammer to produce this product. We are bringing back "the 70's stereo system" starting w/ speakers. I will be visiting youe website to best learn how to use the RAE software. Will be running on a Compaq Presario 2135US laptop, 1.8 ghz, 256 mb, 30 gb drive, 1024 x 768 TFT 15.1" display. Will be using internal sound card, or would it be better to use Creative "Extigy" USB sound unit?. What microphone would you recommend for this configuration?. Any information would be greatly appreciated....thank you..Phil Criddle
Congratulations on an excellent product. I have just downloaded a trial copy (which runs for 5 seconds!)

There is only one area where i think this should be immediately improved, within the RTA section, and that is to introduce clikkers somewhere to select 1/12 and 1/48 octave filtration as well as 1/3 octave already implemented.

It is always the case that in a professional situation, one needs to see the trend/and actual cause of the 1/3 octave amplitudes.  for example far too often in proaudio we need to see if the rise in any given 1/3 octave band is due to a single large amplitude narrow peak, or a  much broader and lower amplitude peak. in order to know if the overall 1/3 octave peak should be reduced (or not) to the same level...using the external 1/3 octave eq sets

thanks again 

your comments re this upgrade suggestion would be most welcome

I have a sound system for bands that i will be using the software for. I hope to enjoy it very much. thank you for your help.



My main reason to use your software is for voice analysis. I have been having speech therapy to alter the quality and pitch of my voice. The clinic I attend uses software to analyze voice, and I am attempting to do the same at home (purely personal use). At this stage I am not sure how appropriate the software is, but once I learn to use it I may be able to give you some feedback on its suitability for this purpose.
I have installed the software and it's running fine. I'm using the application notes on your web site to learn how to use the software. I am quite disappointed that that the version that I bought did not come with the THD analyzer. Pls let me know if it is possible to incorporate the analyzer into my license free. I bought your software thinking that I can use the analyzer as stated in the notes but realize when I went to your web store and realize that THD analyzer is only included in the DSSF3 and not the version that I bought.
I need your software for the measuring of sound emission of an electric arc furnace ('ladle furnace') of 22MVA which has been delivered by my company and is presently being commissioned here in Panzhihua, China. Our customers more and more ask for detailed info regarding the noise produced and possible countermeasures. 

If you should have any hints/tips for me (industrial noise analysis etc.) please let me know, because I am not yet an expert in this field. Many thanks in advance

We design and install sound systems. I hope to use the RTA function to set room equalization. We are trying out your program to see how accurate it is. If it is good, I am going to get a copy for all of my technicians. It is much less money than SIA SMAART LIVE. SMAART will do seat to seat level comparisons as well as polarity checks but we mainly use just the RTA. Your product looks very interesting.
I think this code is excellent. I really was interested in the DSSF3. However, I decided not to purchase it because you CAN NOT EXPORT THE RECORDED DATA so you can then perform additional analysis (if needed) or to generate high quality plots. For the $330 price tag, it very disappointing that the numerical data can not be sent to program like MATLAB, Excel, or simply ASCII files. It is not good enough to export a picture of the plot. Please let me know when you are incorporating these capabilities, I will then purchase DSSF3. Another comment is that it would be a good idea to have a University discount. I teach acoustics to engineering seniors (4th year students) and I think the RA software would be an excellent tool for learning, performing projects, etc.

I run your software on a home-built PC that is a Media Computer that is integrated into my HiFi/video surround system. It is a repository for my MP3 files, functions as a digital TV recorder with an ATI "all-in-wonder" video card, and has a Yamaha digital piano integrated into it. I use your software to set-up the speakers and the room acoustic environment.

Thanks for the fast response.

I'm considering using your software to conduct acoustic analysis of car audio system:

1. fine-tuning amplifier gain settings

2. phase settings on front speakers to achieve proper staging

3. setting correct X-over points on sub and midrange amp for best sound and avoid overlap

4. evaluating amp and speaker performance

Pls let me know if you have any advice for me on how best to do this.

I also hope you can advise me if you know of people doing the same things so that I can learn from them. I've downloaded almost all your application notes on sound measurement! My immediate aim is to be able to tune my own car perfectly to enter a sound competition and hopefully win! =)

Thank you - what should I do in the future if I want to install on another box?

I am using the software with my church sound systems to:

-induce feedback and detect exactly what frequency to take out of the EQ

-sweep the freq range to check speaker performance

-play pink noise to balance system response.


I am using the program to help me design sound identification equipment.
My application is the measurement of sound levels for rollercoasters and other amusement rides.
One issue I have with your program is the format used for the .csv files for output. The data is written into rows instead of columns. I use MS Excel to analyze data and excel is made for using data in columns, it can only input a maximum of 256 data points from a row, but over 65,000 data points from a column.
I have written a software routine that converts your .csv files into multiple files, one for each data set, that has the data converted from rows to columns.
I am very impressed with your program and forsee many uses of it for my company.
Great seller and Excellent Software. Thanks.
The purpose is to use to demonstrate to school pupils, the range of human hearing, and also to measure sound frequencies of various instruments. It may also be used for A-level students to use with a.c. circuit experiments.
"Just what I needed!"
Needs longer evaluation time. I used the mic input to measure vibration displacement (proximity probe 0-10V) using resisters to lower voltage to 500MV. A 10-600HZ tone was fed out the speaker jack thru an amplifier to a electromagnet to measure natural vibration modes to determine the stifness of a metal disk (sawblade). I evaluated several programs and yours was the best for the price and what I needed it for. It would be nice to have a volt meter on the scope to set input voltage.
"wash and go"
I am using it to analyze a pair of speakers I am building. It's really useful for this as it has output and input in one package. It's best point is ease of use. Though I guess that might be because it doesn't do a lot of different things, but it's perfect for my project.
Hobby technician
"A hardware equipment with the same performance would cost 10 000 Euro"
12 years ago I worked with noise reductions. At that time you would need four big hardware boxes for around 50 000 Euro to do the same job as this program. This program cost about 22 Euro! It is also the best user interface I ever have seen. It used to be complicated to learn how to use a narrow band FFT-analyzer, but it is not with this one. Everything s however not excellent. The program has neither export, save or print out which makes it rather useless for "before - after" analyzes. I pity with such a miss on a program that is so good in other respects.
Brennan K
"Great product, worth every penny"

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