looking for ultrasonic source (Joe Pompei )

Subject: looking for ultrasonic source
From:    Joe Pompei  <pompei(at)AUDIA.MUSIC.NWU.EDU>
Date:    Tue, 30 Apr 1996 19:13:55 -0500

As some of you know, I am wanting to take high frequency HRTF measurements, and have settled on the Knowles microphone, which is pretty flat up to 80-100kHz. Now I'm looking for a good ultrasonic source, something that can create frequencies in the 30-100kHz range (or as close as I can get). B&K mics go the distance, but aren't very powerful. Radio Shack (yes, rs) has a tweeter that goes to 40kHz. Does anyone know of any others that might go higher? Narrowband is ok, too... Thanks, Joe Pompei Northwestern University --

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Electrical Engineering Dept., Columbia University