We're working on an interesting application that needs a super tweeter
that can operate at 40 KHz. Anyone have a favorite driver that they'd
like to recommend?

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Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
Tel: 201-801-0812, FAX: 201-801-0912