Frequency Response Testing

[BigFatPat]

I want to learn how to measure and calculate basic Thiele Small parameters and test the frequency response for individual drivers using Audio Tools SPL Pro on my iPhone, a signal generator on my PC, an IMM6 calibrated microphone, a multimeter and test resistors. I understand how to setup the test scenario for 1W at 1 Meter but I'm not sure if I should use A or C weighting within SPL Pro or no weighting at all. I would appreciate specific advice on weighting and any pointers on the test setup.

 

[geraldfryjr]

There are several applications and methods out there!

All you need is a resistor, signal generator, voltmeter and some weight's or a sealed box of known size, I don't know of any apps that use a phone although there may be one out there some where.

Google,

https://www.google.com/search?num=1...lwli...0...1.1.61.hp..1.16.1075.0.eP7waVR0u_A

There are also several threads in this forum on this subject as well, search for REW, SimpleS, Visual Analyzer, HOLMimpulse and RTA will get you started.

http://www.acustika.org/?Home

http://sound.westhost.com/tsp.htm

I love Wave Spectra but it is just a RTA and Wave gen is a very good generator as well they can be found here,

http://www.diyaudio.com/forums/soft...arta-audio-analysis-software.html#post2524170

Note, The Link got moved!! 🙁
You may be able to find it if you search hard enough.


I have compiled a lists of such programs several times before, Sorry that I don't have a particular link for you at this time.

Here is one I have found,

http://www.diyaudio.com/forums/soft...response-entire-sound-system.html#post2916540

I don't use any weighting at all.
Just make sure you enter in the calibration curve for your microphone if you have it.

Cheers!!!

jer 🙂

P.S. This will help you get started as well,

https://www.google.com/search?num=1...llwli...0...1.1.61.serp..7.11.887.lLlLzhGHKFI

 

[BigFatPat]

Hi Gerald, great stuff thanks a lot. I though no weighting would be the way to go but it's good to hear that confirmed from someone that knows what he's doing. I have my calibration file loaded and it all works great on my iPhone. I'll go through your links and get testing!!

Cheers,
Pat