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you might find this link interesting: http://www.atcsd.com/ 6/20/99 11:02 AM Tom Ritchford (tom@swirly.com) wrote: >Mark Spookylaro wrote: > >>The Danelectro post that talks about the small Smoky Amps made me think >>about a new type of speaker that I've heard about that uses very small >>electrostatic drivers and varies the phase of several ultrasonic >>(infrasonic?) frequencies to create a beat (interference) frequency in >>the range of human hearing. Supposedly, the thing is the size of a CD >>or so, and can produce very large sound levels with very low wattage >>because of its efficiency. CAN YOU IMAGINE THE IMPLICATIONS? KEEPING >>YOUR SPEAKER CABINETS IN YOUR GUITAR CASE! > >acoustic heterodyning is the name of the technique, I believe... > >and the speakers are incredibly small, postage stamp sized. >you could get deafening sound from a quarter-watt speaker, >so I'm told. > >However there are several downsides. > >The first is that they are extremely directional... you could hear >immense sound, I could hear nothing. The second is that they haven't >made it out of the lab into speakers yet as they are so new. > > /t > > Matt Peterson Project Manager, Media Services XOOM.com, Inc. 300 Montgomery St., 3rd Floor San Francisco CA 94104 415-288-2505 FAX: 415-288-2575 matt@xoom.com NASDAQ: XMCM