Behringer measurement mic issues

npdang · 20th January 2005, 11:43 PM

I'm using the Behringer ecm8000 mic and trying to do some nearfield non-linear distortion tests. The problem I'm having is the mic clearly overloads, giving me abnormally high distortion levels. Is this to be expected, and if so is there any other cheap alternatives?

audio-kraut · 20th January 2005, 11:50 PM

What are you feeding that poor mic? 150 db's or what? I think any mic will distort - and go kaput - if you drive it too hard. Why not add some distance - the distortion will be still measureable.

rdf · 21st January 2005, 12:04 AM

Sounds like interstage electronics being overloaded to me, the mic pre or whatever it's feeding. Can you give a few more details about your hookup?

npdang · 21st January 2005, 03:02 AM

No clipping on my soundcard or preamp. I'm testing right up at the horizontal plane at the top of the surround. I recall Linkwitz commenting that the Panasonic electrets overload at modest spl's. In any case, this is happening with modest drive levels ~1-3V, not 150db levels.

I'd test at 1m, but I run into problems with drivers of different diameter and room effects and reflections etc.

Just wondering if anyone else has the same experience.

rdf · 21st January 2005, 04:09 AM

I'll take a last kick at the can and pull one from 'My List of Past Mistakes'. Low phantom voltage?

20th January 2005, 11:43 PM	#1
npdang diyAudio Member Join Date: Aug 2004 Location: California	Behringer measurement mic issues I'm using the Behringer ecm8000 mic and trying to do some nearfield non-linear distortion tests. The problem I'm having is the mic clearly overloads, giving me abnormally high distortion levels. Is this to be expected, and if so is there any other cheap alternatives?

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20th January 2005, 11:50 PM	#2
audio-kraut diyAudio Member Join Date: Apr 2004 Location: 12km off the alaska highway in northern BC	What are you feeding that poor mic? 150 db's or what? I think any mic will distort - and go kaput - if you drive it too hard. Why not add some distance - the distortion will be still measureable.

21st January 2005, 12:04 AM	#3
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Sounds like interstage electronics being overloaded to me, the mic pre or whatever it's feeding. Can you give a few more details about your hookup?

21st January 2005, 03:02 AM	#4
npdang diyAudio Member Join Date: Aug 2004 Location: California	No clipping on my soundcard or preamp. I'm testing right up at the horizontal plane at the top of the surround. I recall Linkwitz commenting that the Panasonic electrets overload at modest spl's. In any case, this is happening with modest drive levels ~1-3V, not 150db levels. I'd test at 1m, but I run into problems with drivers of different diameter and room effects and reflections etc. Just wondering if anyone else has the same experience.

21st January 2005, 04:09 AM	#5
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	I'll take a last kick at the can and pull one from 'My List of Past Mistakes'. Low phantom voltage?

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