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Old 17th May 2009, 08:24 PM   #1
thadman is offline thadman  United States
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Default DIY measurement mic

I'm interested in assembling a measurement setup to serve dual purpose as a loudspeaker design tool and as a tool to optimally setup loudspeakers/subwoofers in rooms.

I have a Macbook Pro and plan on combining the Apogee Duet external firewire soundcard with Fuzzmeasure Pro acoustic software.

The last component of the measurement setup to be determined is the mic, of which there are several options.

Behringer ECM8000. Apparently Panasonic stopped producing the capsules for these microphones and they no longer include the previous output transformer. I haven't heard a lot of positive information over on gearslutz about these mics.

Earthworks M23/M30. Expensive ($500 for the M23), but nearly perfect omni mics.
http://www.earthworksaudio.com/28s.html
http://www.earthworksaudio.com/27.html

Calibrated DIY? I know from my experience in loudspeaker design that very capable systems are very possible. Would it be possible to DIY a mic that was equivalent to the M30 or even M50 for reasonable cost? Upon completion of the mic it would be calibrated of course. I know capsules are available, but are the bodies? Assuming bodies can be sourced, this begs the question ... which capsule to choose?

Has anybody completed a DIY mic kit? Was it worth it?

Thanks,
Thadman
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Old 17th May 2009, 09:02 PM   #2
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Try this one?

http://www.linkwitzlab.com/sys_test.htm
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Old 17th May 2009, 09:10 PM   #3
Helmuth is offline Helmuth  Netherlands
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Monacor stageline
EMC40 many calibrations in one grafic
Click the image to open in full size.

behringer emc8000
Click the image to open in full size.

This i use with my behringer emc8000
Click the image to open in full size.

There are also many soundkarts with phantom supply input.
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Old 17th May 2009, 09:13 PM   #4
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I have an ECM8000 and it is useless above 2kHz. The trouble is that I can't get it calibrated in Australia. The response is simular to the above post.

It would be good if there is one with reasonable price that is flat to 15kHz.
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Old 17th May 2009, 09:26 PM   #5
Helmuth is offline Helmuth  Netherlands
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the data is often similar so here I post my calibration data of my EMC8000 61 euro
This will improve your results
Attached Files
File Type: txt 0711-03.txt (28.3 KB, 451 views)
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Old 17th May 2009, 09:39 PM   #6
Helmuth is offline Helmuth  Netherlands
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link 40-70 euro

micro
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Old 17th May 2009, 10:08 PM   #7
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Helmuth,

Thanks. But mine has about 7-8dB peak at around 10-12kHz.

Regards,
Bill
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Old 17th May 2009, 10:21 PM   #8
tresch is offline tresch  United States
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I just received some panasonic wm-61a modules

http://www.speakerbuilder.net/web_fi...diymicmain.htm

gonna try doing that. Anyone else in here been down this route? impressions?
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Old 17th May 2009, 10:45 PM   #9
Ron E is offline Ron E  United States
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I've heard (from ZeroCool on this site) that Naiant makes some mics that are not only flat, but quiet and inexpensive.
http://www.naiant.com/studiostore/microphones.html
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Old 18th May 2009, 04:37 AM   #10
cuibono is offline cuibono  United States
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I've built the linkwitz mic - its easy and cheap. AudioXpress has a recent article on its distortion profile (which is pretty decent), and Kim Girardin calibrated one for me for about $40. Highly recommend, very helpful guy. kmgrdn AT luminet DOT net


Total cost? Like $60 for a very nice calibrated mic. What more could you ask for?
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