Roger Sanders of Sanders Sound Systems was showing his electrostatic speaker.  The Sanders 10B is a hybrid.  Bass is produced by a transmission line utilizing a ten-inch driver.  The price of the system is $12,995, which includes crossovers and bass amps.  The amps and preamp in the system are also built by Roger and are impressively made.  More impressively, everything is made in the USA.  The speakers come with a lifetime guarantee.  The speakers and electronics sounded quite good but I have to believe they would have been a lot happier in a substantially larger room.