Cross-Spectrum Microphone Calibration Service - USA - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 368 Old 06-23-09, 12:52 PM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Anechoic,

Received my calibrated ECM8000 today. Thanks a lot for such quick service!!!

Ray

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post #62 of 368 Old 06-30-09, 11:45 PM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Hi,

First, I would like to thank you (Anechoic) for helping this forum with your calibration services and technical insights. I have a question about the "generic" Behringer ECM-8000 calibration file on the Downloads page, with filename "ECM8000-CS.cal". Is this file based on an average of measurements of ECM-8000's done in your lab? To me, the "generic" calibration file looks flatter in the bass than I would have guessed from the range of response curves you showed in message #43. The "generic" file has -1.40 dB at 20 Hz, -0.54 dB at 25 Hz, while the curves in message #43 appear to range from -5.5 dB to +1 dB at 20 Hz, and from -4 dB to +1 dB at 25 Hz.
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post #63 of 368 Old 07-01-09, 09:09 AM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Quote:
I have a question about the "generic" Behringer ECM-8000 calibration file on the Downloads page, with filename "ECM8000-CS.cal". Is this file based on an average of measurements of ECM-8000's done in your lab?
No, Cross Spectrum does not load the files on our download page.

The ECM8000 generic calibration file is from Sonnie's personal ECM microphone that Cross Spectrum calibrated for him.

Of the calibrations that were carried out on this microphone, we chose the Frontal incident (horizontal on-axis 0 degrees), 1/6th octave spacing file and reduced it to two decimal places. It should be fine for home use.

If you require more accuracy, it's best to get your own microphone calibrated.

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post #64 of 368 Old 07-01-09, 12:07 PM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Thank you for the clarification - the "generic" ECM-8000 calibration file on the downloads page is clearly within range of the response curves shown in #43, if it is understood to be the curve for one particular microphone, rather than an average of all the ECM-8000s tested by Cross-Spectrum.

I agree that the data (the variation of the curves in #43) shows that individual calibration is needed for accurate measurements. Also, it is noteworthy that there is a lot of variation in the deep bass (20 - 100 Hz) (the critical frequency range for measuring subwoofer room response), as well as the highs (5 - 20 kHz).
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post #65 of 368 Old 07-01-09, 09:28 PM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Quote:
Sonic Icons wrote: View Post
Thank you for the clarification - the "generic" ECM-8000 calibration file on the downloads page is clearly within range of the response curves shown in #43, if it is understood to be the curve for one particular microphone, rather than an average of all the ECM-8000s tested by Cross-Spectrum.

I agree that the data (the variation of the curves in #43) shows that individual calibration is needed for accurate measurements. Also, it is noteworthy that there is a lot of variation in the deep bass (20 - 100 Hz) (the critical frequency range for measuring subwoofer room response), as well as the highs (5 - 20 kHz).
Yep, as brueck mentioned, it's pretty much fine for the home user, but if you want accuracy, go ahead and get a calibrated one from Cross Spectrum (you'll get it within a couple days of ordering). He has the best price for a calibrated ECM-8000 (there are many mics out there that you can purchase that are calibrated, most being several times the cost of the Behringer, and for most, not necessary.

Ray

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post #66 of 368 Old 07-02-09, 01:05 AM Thread Starter
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Re: Cross-Spectrum Microphone Calibration Service - USA

To confirm... we have no issues with Herb quoting prices here at the Shack if he so desires.
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post #67 of 368 Old 07-02-09, 01:49 AM
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Re: Cross-Spectrum Microphone Calibration Service - USA

Sonnie,
I didn't know if I would be able to quote the price. Since I just purchased it from Herb, here is some info.

Sonic Icons,
Here is Herb's site:
http://www.cross-spectrum.com/measur...behringer.html
You have a choice of to levels of calibration:
1 - Freq response only ($85)
2 - Freq response and Polar Data ($100)

His site has a lot of useful info if you have not checked it out already.

Ray

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Happy Listening!!! Listen with an open mind and heart!!!

Last edited by cavchameleon; 07-02-09 at 08:01 AM. Reason: addition
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post #68 of 368 Old 07-02-09, 03:35 AM
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Re: Cross-Spectrum Microphone Calibration Service - USA

As an aside to all this, with REW V5 the cal data can (ideally should) include phase as well as SPL correction, so should look at including phase data from calibration.
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post #69 of 368 Old 07-02-09, 08:50 AM
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Re: Cross-Spectrum Microphone Calibration Service - USA

If we were going to do so, would it not make sense to calibrate the mic/preamp as a system, since there may be more phase effect in the combination than just in the mic?

Looking for me, just google my username. I have used the same one for most sites for many years.
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post #70 of 368 Old 07-03-09, 02:38 PM
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Re: Cross-Spectrum Microphone Calibration Service - USA

I see you also calibrate the Galaxy CM-140, but along with selling pre-calibrated ECM8000, do you also sell pre-calibrated CM-140's? I'm planning on picking up a CM-140 but wanted to find out if these are available before I purchase from some where like Musician's Friend.
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