Hi, Check out the Bryston 4BSt or SST. They were designed to drive the hardest speakers I can think of, the Dayton Wright gas filled electrostatics. I've heard these amps on Audiostatics { which I own} and Quad 63's and even Quad 57's and the amp just cruises and sounds great.
Class D Amp For 'Stats?
For a number of reasons, I am considering the purchase of a Class D amp (or amps) to drive my Sound Lab A-1s. Most uses of such amps detailed here and elsewhere seem to have been with 'conventional' speakers, which obviously present very different impedance loads than a full range electrostatic (approximately 40 ohms in the bass, dropping to 2 ohms at the highest frequencies). I would be most interested to hear of members' experiences.