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Old 28th March 2006, 12:03 AM   #1
lndm is offline lndm  Australia
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Default Measurement mike

I picked up a Genexxa 33-3009 unidirectional dynamic, and would like to know whether it would make a good speaker measurement tool, or get a response plot for it.
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Old 28th March 2006, 09:28 AM   #2
soongsc is offline soongsc  Taiwan
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Default Re: Measurement mike

Quote:
Originally posted by lndm
I picked up a Genexxa 33-3009 unidirectional dynamic, and would like to know whether it would make a good speaker measurement tool, or get a response plot for it.
If there's a good spec on it, then ith should be okay. If not, it might just be for casual usage.
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Old 28th March 2006, 09:30 AM   #3
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Have you contacted Genexxa for specs?
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Old 28th March 2006, 10:07 AM   #4
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Omnidirectional electret microphone capsules work well if you mount them on a 30cm metal tube of the same diameter. Much of the irregularity in a microphone response comes from diffraction effects and any casing.
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Old 29th March 2006, 07:26 AM   #5
lndm is offline lndm  Australia
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Quote:
Originally posted by pinkmouse
Have you contacted Genexxa for specs?
Yes, no good

Quote:
Originally posted by davidsrsb
Omnidirectional electret microphone capsules
It has a 1/2" vc and a 1" diaphragm
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Old 29th March 2006, 02:10 PM   #6
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I mean those tiny microphone capsules you find in most consumer audio. Many measurement microphones are just one of these in a tube with a calibration data table. They are often within a few dB of flat up to 20KHz.

As I was saying earlier the mounting of the microphone has major effects on the responce. We used to be in the telephone set business and I have some nice B&K equipment. Tweaking a handset mechanics to meet the CCITT spec was quite hard.
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Old 29th March 2006, 08:25 PM   #7
lndm is offline lndm  Australia
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I currently use a radio shack SPL meter. I have modded the capsule mount and the electronics. It seems to give a flat response up to 7k where it rolls off sharply (I can work around this).

Unfortunately I cannot comfirm that it is flat. People have listed compensation charts but they do not match each other, and even if they did, after modding they no longer make sense. I have to put the larger part of faith in simulated results.
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