"Bill Dudleston typically sets up several complete systems in large rooms at shows. I heard the largest speakers, the Aeris XD ($23.4k) which sounded like a very good value driven with the Wavelet II preamp with digital crossover and DSP and the iV2 Ultra high current dual mono stereo amp. Their speakers tend to be on the high-efficiency side, making them useable with lower power tube amps, but Bill is partial to solid state and he's at the forefront of DSP with his Wavelet and speakers. Excellent workmanship with the speakers."