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Old 13th December 2007, 12:10 PM   #1
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Default Tweeter clean out past 20K

We are doing some testing of Microphones in an anechoic chamber and i need a cheap tweeter with clean response out past 20K for use as a lab horse. any recommendations.

We have over 120db of headroom from the noise floor so it doesn't need to have great output or anything. just void of any diaphragm breakup and as flat as possible for the budget out past 20K.



Suggestions.



Zc
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Old 13th December 2007, 05:07 PM   #2
KCHANG is offline KCHANG  United States
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Default Fostex FT17H?

Based on the published spec, it goes way out to 50KHz, and is relatively flat. You can get it from Madisound http://www.madisound.com/index.html

for $37.10. Moreover, its efficiency is given as 98.5dB/W(m).

Cheers,

Kurt
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Old 13th December 2007, 05:30 PM   #3
MarkMcK is offline MarkMcK  United States
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Would you kindly share why you are testing microphones in this manner? What are you hoping to achieve that cannot be done with the standard techniques for testing microphones?

Mark
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Old 13th December 2007, 06:08 PM   #4
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I am working with Bruce C Olson and Dave Berg from Orfield acoustical labs on a project. I cant discuss much of the details due to the client involved. But we are testing some microphones and we didn't have a device that would go past 10K clean available to us. and we are specifically looking at the upper frequency ranges.

I will look into the fostex tweeter. Thanks





Zc
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Old 13th December 2007, 06:15 PM   #5
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The horn of the fostex driver might cause some reflection problems with testing. BUT, Madisound has some Hi-Vi drivers that look interesting.

http://www.madisound.com/catalog/pro...oducts_id=1484


The response of the RTL1 looks like it goes out past 40K pretty clean. If that chart is accurate.

That might be our huckleberry


Zc
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Old 14th December 2007, 03:12 PM   #6
MarkMcK is offline MarkMcK  United States
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Thanks for sharing what you could. I wish you well with your endeavors and hope you can find a tweeter sufficient for your needs. I hope you find cleanliness whether this means low distortion, flat frequency response, smooth off-axis response, or coherent transient response.

Mark
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Old 14th December 2007, 03:17 PM   #7
Nordic is offline Nordic  South Africa
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Why not see if matt still have some of the Vifas? they go past 30k...
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Old 16th December 2007, 06:04 PM   #8
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I have used ribbons in the distant past which measured well past 100k.
I don't have a reference at hand, but they were good.
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