The S-3EXs are actually predecessors of TAD speakers and therefore both designs share the same principles. The focal point is a CST, the Coherent Source Transducer, with a tweeter sitting in the acoustic center of a midrange driver. This should improve time alignment of both drivers. The time alignment is further reinforced by a concave shape of the speaker which is bent in a radius of 3m (as if the speaker was wrapped around a 6 meters big sphere). The center of this sphere is the listener and this is also the optimum distance for your listening seat. The CST is made of Ceramic Graphite, the bass units are Aramid, which is modified Kevlar. The reflex port fires forward.A massive plinth is an inseparable part of the speakers. There are actually only three spikes that stabilize the speaker; the rear two legs of the plinth are there only for visual balance and they work like the safety side wheels of a kids first bike. I had no issue with the stability of the rather high speakers on any surface (a thick carpet and wooden floor).

Immaculate condition without dents and scratches. Rare and awesome speakers. Amazing sound. Built like tank. New costed $8000. http://www.hifimusic.co.il/Audio-Review%3A-Pioneer-S-3EX-t4668.html PLEASE BEFORE BIDDING ASK ABOUT COST OF THE DELIVERY.