Microphone calibration files
- Thread starter kafercup
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That's what many of us hope for.
However, take a look at the calibration file that came with your iMM-6C and you will find the frequency range where it simply doesn't need any additional calibration.
Chances are that the calibration values contained in the file will be < 1dB from at least 40 Hz to 4000 Hz. If so, the calibration file would actually not provide any real benefit with WiiM's default settings for room calibration.
Maybe we should start a thread where everybody could post the lower and the upper limit where the data in the calibration file deviates more than 1 dB from zero.
For my Dayton iMM-6C, the calibration is between +/- 1dB from around 80-4400 Hz, and for the iMM TRRS from 20-3830 Hz (see graph).
I'll need to redo my RC as I haven't tried it with the newer versions of firmware for some time.
I'll need to redo my RC as I haven't tried it with the newer versions of firmware for some time.
what happens between 1700 and 4500 on the normal imm6 is a bit annoying because a really sensitive area on the ear side and impactful..and in use with standart rc of wiim 40-4k
(that wiim simply integrates the file will avoid having the question asked twice a day ;-) )
(that wiim simply integrates the file will avoid having the question asked twice a day ;-) )
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slartibartfast
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My iMM6 with TRRS connection calibration is +/-1dB between 22.3Hz and 4044Hz.
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slartibartfast
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I zoomed in a lot more so the y-axis is only -2dB to +2dB
slartibartfast
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Comparison of the two iMM6 cal files.
The amount of correction needed for that iMM-6C low end response is pretty disappointing, I think.
While the bass region isn't as critical as the midrange I'd rather not want to use this mic below 45 Hz with no calibration applied.
mattzildjian
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Hoping someone can clear up a quick question I have about calibration files.
If it says for example
20.0 -5
does it mean the microphone is picking up 20hz 5db too low and needs to be boosted in the results.
Or
does it mean the microphone is picking up 20hz 5db too loud and needs to be reduced in the results.
Thanks
If it says for example
20.0 -5
does it mean the microphone is picking up 20hz 5db too low and needs to be boosted in the results.
Or
does it mean the microphone is picking up 20hz 5db too loud and needs to be reduced in the results.
Thanks
Saponetto
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It means that the required linearity is achieved by appliying a -5 gain at 20 Hz microphone frequency response.
mattzildjian
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Ok this is how I initially read it.
So the microphone naturally measures 5db too hot at 20hz, so the measurement needs to be reduced by 5db to become an accurate reading.
slartibartfast
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Are you sure? Mics normally roll off at high and low frequencies.
mattzildjian
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this is exactly why I was questioning it. Intuitively I would expect the upper and lower ends of frequencies to be the least sensitive ones. My IMM6C calibration file is much like the above example, mostly flat in the midrange but the extreme ends have negative values in the calibration file. 20hz -1.4db correction, 20khz -4.5db correction.
slartibartfast
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It was discussed a while ago
I am now confused by the way REW handles calibration files. As I understand it the Dayton Audio calibration files contain gain values to be added to the measured response to obtain corrected values for each frequency. REW subtracts the calibration curve instead of adding it. Maybe I am wrong about the calibration files but allegedly Dayton Audio confirmed it here
sound.stackexchange.com
Dayton Audio mic calibration file details
Dayton Audio provides calibration measurements for some of their mics in the form of a text file mapping frequencies to gains for that particular mic (by serial number), e.g. one of mine is: *1000H...
Nobody did believe me back then (although I was right, if course).It was discussed a while ago
I am now confused by the way REW handles calibration files. As I understand it the Dayton Audio calibration files contain gain values to be added to the measured response to obtain corrected values for each frequency. REW subtracts the calibration curve instead of adding it. Maybe I am wrong about the calibration files but allegedly Dayton Audio confirmed it here
Dayton Audio mic calibration file details
Dayton Audio provides calibration measurements for some of their mics in the form of a text file mapping frequencies to gains for that particular mic (by serial number), e.g. one of mine is: *1000H...
I don't see how this would have changed.
slartibartfast
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It wasn't that they didn't believe you it was more amazement that Dayton Audio had got it completely wrongNobody did believe me back then (although I was right, if course).
I don't see how this would have changed.
. They never replied to my email requesting confirmation mattzildjian
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ok so.. if I am using an IMM6C with RoomFit. do I need to invert the numbers on the calibration file or not?
hgo58
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Unfortunately @WiiM Support have not documented the file format they expect but have included examples from one vendor. Maybe we can deduct something from that?
Tutorial: Microphone Calibration File Import in WiiM Home
The WiiM's Room Correction feature improves your listening experience by adjusting the audio output to match your room's acoustics. The feature has now been enhanced to support the import of a calibration file for an external microphone. This cal...
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