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RE: Microphones & op-amps

Posted by EdG (A) on November 8, 2009 at 11:35:22

In Reply to: Microphones & op-amps posted by emsquare on November 8, 2009 at 06:38:42:

Several years ago, I measured the acoustic response of the MG1.6 using a Panasonic WM-61A microphone element and a microphone preamplifer of my own design plugged into the line inputs of a desktop computer soundcard. I wrote software to generate white noise and perform a FFT on the measured data. The results are shown below (green trace is the stock MG1.6). My results were very similar to the Stereophile measurements of the MG1.6.



While the Panasonic WM-61A has ruler-flat frequency response, its weakness is that it has an enormous amount of low-frequency noise (as do all inexpensive condensor microphones) that limits the dynamic range. My low-frequency measurements could go only down to ~40Hz due to microphone noise.

Note that the mic inputs on soundcards have a high-pass filter to remove low-frequency noise. This precludes using the mic inputs for accurate frequency response measurements. Good results are possible using a microphone pre-amplifier and the line inputs.
Ed

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