Tweeter clean out past 20K

Zero Cool · 13th December 2007, 12:10 PM

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

KCHANG · 13th December 2007, 05:07 PM

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

MarkMcK · 13th December 2007, 05:30 PM

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

Zero Cool · 13th December 2007, 06:08 PM

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

Zero Cool · 13th December 2007, 06:15 PM

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

MarkMcK · 14th December 2007, 03:12 PM

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

Nordic · 14th December 2007, 03:17 PM

Why not see if matt still have some of the Vifas? they go past 30k...

myhrrhleine · 16th December 2007, 06:04 PM

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.

13th December 2007, 12:10 PM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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

13th December 2007, 05:07 PM	#2
KCHANG diyAudio Member Join Date: May 2004 Location: San Jose, CA, USA	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

16th December 2007, 06:04 PM	#8
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	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. __________________ Just because you can't hear it doesn't mean no one can.

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13th December 2007, 05:30 PM	#3
MarkMcK diyAudio Member Join Date: Aug 2003 Location: Ohio	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

13th December 2007, 06:08 PM	#4
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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

13th December 2007, 06:15 PM	#5
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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

14th December 2007, 03:12 PM	#6
MarkMcK diyAudio Member Join Date: Aug 2003 Location: Ohio	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

14th December 2007, 03:17 PM	#7
Nordic diyAudio Member Join Date: Sep 2005	Why not see if matt still have some of the Vifas? they go past 30k...

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