Sonorus Audio was playing a complete Sonorus system during my visitthe Sonorus ATR10 Analog Tape Reproducer ($10,000), which is a reconditioned and modified Revox PR99, Sonorus VPA 11 line preamplifier and OTL headphone amp, Sonorus ESL06 200Wpc High Voltage OTL tube amplifier (driving the electrostatic speakers), an OTL09 120Wpc OTL amplifier (driving the woofers), the ESL06 full-range electrostatic loudspeakers, and a Definitive Technology BP20 "used as back-pressure compensation woofers for the ESL06s." The system price for the preamp, OTL amps, and loudspeakers is $100,000.
We listened to Pink Floyd on open-reel tape and it soundd appropriately ethereal and spacey. My one issue with this room was the heatmy guess is those OTL amps were due some degree of blame. If you live in an igloo you may want to look elsewhere.