Microphone suggestion for speaker testing - Thank You in Advance - diyAudio
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Old 4th July 2002, 06:47 PM   #1
alvaius is offline alvaius  Canada
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Join Date: Feb 2002
Location: Toronto
Question Microphone suggestion for speaker testing - Thank You in Advance

Hello fellow DIYers.

I have the electrical set up
- SoundBlaster Extigy (to my laptop)
- good cassete player for a microphone Pre-amp if needed
- Amplifier - My old NAD2050
- Software [http://www.sumuller.de/audiotester/maine.htm] - cheap and highly recommended!

The Anechoic chamber
- O.K., it is an elevated platform on my outside deck


Now, all I need is a microphone that won't set me back an arm and a leg. Would prefer a studio mike with a good 20-20 response, but I would live with just about any good microphone that has a well calibrated response that I can then compensate the speaker response with.

? If my outdoor response is somewhat anechoic, does it matter if the microphone is unidirection or omnidirectional [responses from experience preferred].


Looking forward to your suggestions and thank you in advance.

Alvaius!
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Old 4th July 2002, 07:35 PM   #2
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Join Date: Sep 2001
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Try "Old Colony Sound Labs" (or something like that) Mitey Mike...
These are quite cheap and they offer a caliberation service (extra) that comes on a floppy that you can load into your pc. For ultimate accuracy I recomend the caliberation it is well worth it. I use one with my "Imp" audio analyzer and it works a treat...
tomcat
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Old 4th July 2002, 09:18 PM   #3
CHRIS8 is offline CHRIS8  United States
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Join Date: Dec 2001
Location: VA, USA
Cheapest mic of accuracy is to make your own using a panasonic capsule. You can get capsules with a calibration file, that are rather accurate for $32 + shipping from Kim Giardin. These are the same capsules used in the mitey mike, which in addition is only a tube added to hold the mic capsule. He can be reached at:

kmgrdn@luminet.net

If you use a preamp, please insure it has a linear frequency response, or obtain one that does. You can make your own, or partsexpress.com offers an ok priced, accurate mic preamp also. part number: 245-032 or they also have a velleman kit unit, for about $12, you need to add jacks, case and regulated power supply to use it though. Probably $45-$50 plus labor for that unit in the end.

-Chris
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Old 5th July 2002, 07:24 AM   #4
ergo is offline ergo  Estonia
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Join Date: Mar 2001
Location: Tallinn, Estonia
I'm using EMM8 mic from
http://www.ibf-akustik.de/

and I'm very happy with it. It's also very reasonably priced and comes with calibration data....

Ergo
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Old 5th July 2002, 09:38 AM   #5
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Location: Dublin, Ireland
Linkwitz Lab pages have some info on modifying the Pannasonic capsule to get the most from it.

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

DocP
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Old 5th July 2002, 04:12 PM   #6
alvaius is offline alvaius  Canada
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Location: Toronto
Thank you for the great replies. I am going to buy them from Digikey. They are quite inexpensive!
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Old 5th July 2002, 05:09 PM   #7
jmiyake is offline jmiyake  United States
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Join Date: Apr 2002
Location: San Jose, Ca.
Default Which mike?

Hi alvaius,
Which Digikey mike are you considering and what is your reasoning regarding that choice?

Thanks,
James
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Old 5th July 2002, 11:18 PM   #8
alvaius is offline alvaius  Canada
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Join Date: Feb 2002
Location: Toronto
I am going to get a couple of each of the following:

WM-60AY and WM-61A. The WM-61 is a bit less sensitive but has better signal to noise. If you look above there is a link to some modifications.

If you go to the Panasonic Web-Site and look at the specs, these things are extremely flat (we are talking less that $5 each!).

http://www.panasonic.com/industrial/...ts/rec_mic.htm

Look at the response curves, they are no more than a few db off from 20-20 and where I am likely to have cross-over frequencies, i.e. 2K, they are very good!

Jack
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Old 5th September 2002, 07:26 AM   #9
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Join Date: Feb 2002
Location: Germany
Question low distortion measuremente mike?

Anybody got any suggestion as to what type of microphone has very low distortion so it could be used to characterize the distortion of a high-quality driver?

The link to Linkwitz labs had a description on how to change the FET in Panasonic electrets from common source to source follower to lower distortion. But I guess one could do better by replacing the FET with an op-amp or maybe by using something other than an electret...

Eric
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Old 5th September 2002, 07:40 AM   #10
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Location: Dublin, Ireland
Hi Eric,

Instrumentation mics tend to be high polarisation voltage condenser capsules of relatively small diameter. The best manufacturer of these would be B&K who make stunningly good quality and beautiful kit that is a joy to use, as is all their instrumentation kit, but you pay for it. Unless you are willing to remortgage your house, stick with the modified WM-60AY and WM-61A.
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DocP
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