If anybody else has access to two Umik-2's, it would be great if they could do a quick comparison measurement, i.e. setting up REW, a microphone stand and a speaker, and just swapping out the Umik-2 and the calibration. I'm getting 2 to 3 dB discrepancies, with one mic having a tilted response with respect to the other, i.e. 2dB higher below 200Hz and 3dB lower above 2kHz than the other. Not so good for room equalization. I posted on the miniDSP forum, but so far nobody seems to be able to do the equivalent test.
I'm not really expecting anything better than 0.5dB or thereabouts, but 2-3dB discrepancy seems a lot. The results (SPL vs frequency curves) are very reproducible for each mic itself between removal and remounting on the microphone stand, the microphones (with calibrations) just don't agree with each other. 108 and 111 are one Umik-2, 109 and 110 the other:
The agreement between one of the Umik-2's and the microphones built into my Surface 7 tablet seems almost better (after aligning overall sensitivity, i.e. matching SPL's at 1kHz) than the agreement between the two Umik-2's - ok, not quite, but still:
(The Umik-2 and the Surface 7 tablet were in different positions, so one should probably ignore the low frequency room mode details).
I'm not really expecting anything better than 0.5dB or thereabouts, but 2-3dB discrepancy seems a lot. The results (SPL vs frequency curves) are very reproducible for each mic itself between removal and remounting on the microphone stand, the microphones (with calibrations) just don't agree with each other. 108 and 111 are one Umik-2, 109 and 110 the other:
The agreement between one of the Umik-2's and the microphones built into my Surface 7 tablet seems almost better (after aligning overall sensitivity, i.e. matching SPL's at 1kHz) than the agreement between the two Umik-2's - ok, not quite, but still:
(The Umik-2 and the Surface 7 tablet were in different positions, so one should probably ignore the low frequency room mode details).
Last edited: