They might have been electrostatic blocks? Basically a big piezo crystal that expands, as used in some camera focus controls. You need a well regulated high voltage to operate them though. I've never seen anything like that as a bass driver. For ideas to experiment you could check out servo operated bass drivers and the acoustic wave cannon design.
http://www.servodrive.com/basstech7.html http://cardhouse.com/x09/wave.htm On Tue, 08 Jan 2008 10:55:50 +0900 PSPunch <[EMAIL PROTECTED]> wrote: > > Hi all, > > I would first like to apologize that this is totally unrelated to Pd. > However I figured that this list is the most likely place to find an > answer among the communities I subscribe to. > > > Years ago I used some driver units to playback super low frequencies, > down from the inaudible up to probably 100Hz at most. > It was more like a chunk of steel designed to mount on any surface > expecting it to resonate. These units were also very inexpensive and ran > for 10s or 20s of US dollars I think. > > Today when I search for driver units of such kinds, all I can find are > ones which look more like speaker cones and not exactly what I recall. > > Does anyone know of where to look, or keywords pointing to such > products? and hopefully places I can purchase them online? > > BTW, of course the goal is to drive some of these using PD, inspired by > Roman's work using solenoids :) > > -- > David Shimamoto > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list -- Use the source _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
