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On 07/02/2013, Goran Finnberg wrote: > Don Cox: > >> Most but not all. Quad's electrostatic speakers are infinite baffle >> designs, and are of very high quality (and price). > > Not so. > > The Quad electrostatic speakers are dipole speakers. > > http://en.wikipedia.org/wiki/Loudspeaker_enclosure > If you mount ordinary cone drive units on a similar size panel, you get out-of-phase sound from the back just as in the Quads. I suppose the chassis of the cone drivers might reduce the level slightly, but basically I see no difference in the two cases. Wharfedale made an infinite baffle speaker in direct imitation of the original Quad (1950s) electrostatics, but using cones. My recollection (from 1968) is that the sound was good. > Regards -- Don Cox [log in to unmask]