Great question. I asked this some time ago and was refered to the "audio toolbox", which was about $1000. More than I wanted to spend. But to answer your question there are inexpensive spectrum analyzers. HP works FFT spectrum analyzer at: http://www.hpw-works.com/ it's between $69 and $300 depending on options. Audua Speaker Workshop: www.audua.com. You can download an alpha product for free. Sample Champion is another that you can download a trial version for free at www.purebits.com. I wanted to do the same thing you are trying to do, but I can't find a linear microphone. Some of these programs have methods to calibrate the microphone for non-linearity, but if you don't have a flat source to do the calibration it's basically impossible. Hopefully, someone else will post some ideas on microphones or methods to calibrate them. If you get a set-up like this working, please post it--I'm sure many audiogoners would be interested.
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