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Old 19th June 2013, 10:03 PM   #1
aborza is offline aborza  United States
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Default Measurement Mic - Audyssey MultEQ microphone?

I have a couple Audyssey MultEQ microphones from a couple HT receiver purchases (see pics below). I never gave them a thought. Figured they were junk. But recently, I have read on the net that they are quite quite flat and quite consistent. Unfortunately all I have seen concerns use of the mic for room eq. These mics are very solid and even come with a brass threaded insert on the bottom to use them on a tripod. Nice!

Any Audyssey enabled HT receiver comes with one of these mics. There are lots of them around. It sure would be nice to have information available on how to use these mics for speaker measurement and design.

So a couple questions come to mind:

The mics are designed to be used in the vertical position:

Click the image to open in full size.

But for nearfield and other typical speaker measurements, mics are usually used in the horizontal position:

Click the image to open in full size.

Unfortunately, a mic's freq. resp. may be very different in each position. Does anyone have info re freq. resp. and consistency for horizontal use? How about vertical use?

Even though they are reportedly quite flat, that can be improved with a cal file. Are there any generic calibration files available for horizontal use? How about vertical use?

Will these mics need a pre-amp?

And last, does anyone have experience, knowledge or suggestions re: using the Audyssey MultEQ microphones in speaker measurement and design? Care to share?

Thanks
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Old 24th June 2013, 04:47 AM   #2
RNMarsh is offline RNMarsh  United States
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Microphones designed for use in the far field have a flat random incidence response curve ---> The vertical position--- it is better for far field measurements.

That means it is not flat at zero degree incidence (horizonal position).

Thx-RNMarsh
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Old 24th June 2013, 05:50 AM   #3
aborza is offline aborza  United States
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Thanks for the reply.

How are they different? If a mic is lets say a mic needs no calibration in the horizontal position. it measures perfectly flat. How would its response look if used horizontally?

And conversely, if a mic is inherently flat horizontally, what would its curve look like if used vertically?

I think this will help me understand what I am looking at.

Thanks for your comments.
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Old 24th June 2013, 06:20 PM   #4
RNMarsh is offline RNMarsh  United States
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Only a general statement --- for a flat response far off the zero axis, the on axis is peaked.
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Old 27th June 2013, 04:26 AM   #5
aborza is offline aborza  United States
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Thank you
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