Great price on those. I've never heard a speaker system with a passive radiator (in their literature Altec calls it a "free suspension phase inverter"-- I think that's their name for a passive radiator?).

http://altecpro.com/pdfs/vintage/Spe...%20Systems.pdf

Does anyone here know what "exactly" a passive radiator is supposed to do for/to bass response? Wonder what h.f. driver those little horns have driving them and whether or not it's a "real" Altec h.f. driver? I'd love to hear a pair of these and at $150 I'd be auditioning them today (and possibly buying them) if they weren't so damn far from here. Come to think of it, they're right in Bfish's back yard. Earth to Bfish--time for your triumphant return?