UMIK-1 vs UMIK-2

Mike-48

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May 27, 2019
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127
Location
Portland, Oregon, USA
Here is a measurement comparing the two mics. Not much difference above 20Hz, and below 20Hx I don't care.
So the between-mic results are close, but between-calibration results are not. It's frustrating that mic calibration is so variable. A third independent calibration might give a hit of what's going on (not that I'm suggesting you find one).

I owned a TacT 2.2X DSP preamp almost 20 years ago, which came with a mic and cal file. At my request, TacT recalibrated the mic and sent a new cal file. Then, I bought a third-party mic with its own calibration file. The TacT's automated DSP software gave quite different-sounding results across the three possibilities. I picked the one that sounded flattest and most natural to me when I played back acoustic piano runs and such. Today, I tweak bass by ear, 1/8 of a dB at a time, on my Anthem preamp, whose proprietary mic comes with an encoded calibration file that will frustrate any user who wants to know what really is going on. So not much has changed! The scientist in me is a bit perturbed by all that, though it's usually easy enough to put out of my mind and enjoy the music.
 

thothsong

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Jun 29, 2021
Messages
38
So the between-mic results are close, but between-calibration results are not.
That chart is comparing UMIK-1 vs UMIK-2, both using the CSL cal files. It's not comparing a single mic using miniDSP vs CSL cal files. So it's not addressing your original point.
 

Mike-48

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Joined
May 27, 2019
Messages
127
Location
Portland, Oregon, USA
That chart is comparing UMIK-1 vs UMIK-2, both using the CSL cal files. It's not comparing a single mic using miniDSP vs CSL cal files. So it's not addressing your original point.
Yes, of course. My comments were based on both that post and the previous post, which together show that the mics give the same result, but the two calibration curves for each mic differ quite significantly. This is a big area of uncertainty when we use such mics in audio. It is helpful to know that in the range 300 Hz to 4 kHz it didn't make a difference, at least with this pair of calibration files. It's still troubling that the user can't have much faith in these mic calibrations. Like @AustinJerry, I'm more inclined to trust the CSL curve, but that inclination is not based on any data at all. It's mainly a hunch, though I suppose the demonstrated agreement between mics with the CSL curves are used suggests that they are likely to be accurate (or inaccurate in the same way).
 

thothsong

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Jun 29, 2021
Messages
38
It's been a week now, and miniDSP hasn't responded to my support ticket about the UMIK-1 vs UMIK-2 measurement differences. Disappointing. I may look into having CSL calibrate both.
 
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