DIY measurement mic

thadman · 17th May 2009, 09:24 PM

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

Peter M. · 17th May 2009, 10:02 PM

Try this one?

http://www.linkwitzlab.com/sys_test.htm

Helmuth · 17th May 2009, 10:10 PM

Monacor stageline
EMC40 many calibrations in one grafic

behringer emc8000

This i use with my behringer emc8000

There are also many soundkarts with phantom supply input.

HiFiNutNut · 17th May 2009, 10:13 PM

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.

Helmuth · 17th May 2009, 10:26 PM

the data is often similar so here I post my calibration data of my EMC8000 61 euro
This will improve your results

Helmuth · 17th May 2009, 10:39 PM

link 40-70 euro

micro

HiFiNutNut · 17th May 2009, 11:08 PM

Helmuth,

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

Regards,
Bill

tresch · 17th May 2009, 11:21 PM

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?

Ron E · 17th May 2009, 11:45 PM

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

cuibono · 18th May 2009, 05:37 AM

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?

17th May 2009, 09:24 PM	#1
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	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 __________________ "It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them."

17th May 2009, 10:02 PM	#2
Peter M. diyAudio Member Join Date: Jan 2005 Location: Østfold	Try this one? http://www.linkwitzlab.com/sys_test.htm __________________ Note to myself: Never again use fingers to check if there still is voltage left in a capacitor...

17th May 2009, 10:10 PM	#3
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	Monacor stageline EMC40 many calibrations in one grafic behringer emc8000 This i use with my behringer emc8000 There are also many soundkarts with phantom supply input. __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

17th May 2009, 10:39 PM	#6
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	link 40-70 euro micro __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

17th May 2009, 11:45 PM	#9
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	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 __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan


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17th May 2009, 10:13 PM	#4
HiFiNutNut diyAudio Member Join Date: May 2004 Location: Sydney	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.

17th May 2009, 11:08 PM	#7
HiFiNutNut diyAudio Member Join Date: May 2004 Location: Sydney	Helmuth, Thanks. But mine has about 7-8dB peak at around 10-12kHz. Regards, Bill

17th May 2009, 11:21 PM	#8
tresch diyAudio Member Join Date: Dec 2008	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?

18th May 2009, 05:37 AM	#10
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	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? __________________ double complete rainbow all the way!!

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