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Old 3rd July 2010, 03:21 PM   #1
sendler is offline sendler  United States
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Default Dayton EMM-6 cal files are wrong

The Dayton EMM-6 measurement mic is a great deal at $50 but the calibration files they are supplying are very inaccurate. I had the mic calibration verified by a third party and the Parts Express calibration measurement is way off. Don't use it. The extreme wiggles are measurement artifacts and the flatness of the extension at the frequency extremes is completely incorrect. The first attachment is the PE measurement. The second is the third party calibration.
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Dayton EMM-6 Electret Measurement Microphone | Parts-Express.com
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See the thread at PE
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Dayton mic 3db peak/ dip? - Techtalk at Parts-Express.com
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File Type: jpg Dayton EMM6 0194 cal.jpg (90.7 KB, 475 views)
File Type: jpg EMM-6cal2.jpg (93.3 KB, 451 views)
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Old 27th July 2010, 07:46 AM   #2
palesha is offline palesha  India
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can u let us know the third party who calibrated the mid?
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Old 27th July 2010, 08:48 AM   #3
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Your mic is a lot closer to flat than mine (enclosed cal files were similarily out-to-lunch)

dave
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File Type: png EMM-6-calibration-1.png (47.6 KB, 415 views)
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Old 27th July 2010, 08:51 AM   #4
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Quote:
Originally Posted by palesha View Post
can u let us know the third party who calibrated the mid?
Cross Spectrum Labs

dave
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Old 3rd July 2012, 02:06 PM   #5
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Kicking an old thread here, but I've come to the same conclusion. The mics are okay, but only if you use them without the supplied calibration file!

A friend and I both purchased a 'calibrated' Dayton EMM-6 from PE. My friend noticed he was measuring the same narrow-band deviations with different kinds of speakers and suspected it was the calibration file. So we decided to do a comparison measurement with both mics.

FYI, we've plotted the measured difference between both microphones (so no cal used) and the difference between the calibration files. Both plots should be identical, but there's not even a hint of similarity... Measured result is accurate above 200 Hz (gating).
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File Type: png Dayton EMM6 measured vs calibration difference.png (36.8 KB, 300 views)

Last edited by a_tewinkel; 3rd July 2012 at 02:11 PM.
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Old 4th July 2012, 01:53 PM   #6
Pano is offline Pano  United States
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I've heard that P.E. has fixed this and the new calibration files are much better. But I don't have confirmation of that.

Looking at Sendler's third party calibration, I'm suspicious. I've never see a mic that flat without EQ. There should be a HF bump on axis related to the size of the capsule. We see it in Dave's plot from the same source, that's what you would expect from a mic of that size and type. Wonder what's up?
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Old 4th July 2012, 03:25 PM   #7
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Does anyone know how flat an Audiomatica Clio Mic-01 response is. Is their response chart also wrong ?

What were the serial numbers of the Dayton EMM6's mentioned above.
Mine is 3217 . Any idea if this one comes after the 'correction' by Dayton ?
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Old 4th July 2012, 11:36 PM   #8
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Quote:
Originally Posted by Pano View Post
I've heard that P.E. has fixed this and the new calibration files are much better. But I don't have confirmation of that.
We ordered our mics in November of 2010 (serials 888 + 889). Any idea when they supposedly fixed it?
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Old 5th July 2012, 04:18 AM   #9
Pano is offline Pano  United States
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Ahhhh..... good question. Maybe take a look at the P.E. forum. But I think it was after 2010.
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Old 5th July 2012, 04:52 AM   #10
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I suppose we can take a difference signal between a calibrated and uncalibrated mic to determine the performance of the uncalibrated mic. The difference can be nulled ( adjusted for 0 dB ) at 1 Khz. Then the accuracy of the sound source shouldn't matter.
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