I have the Innersound Kayas, which were designed by Roger, and in many ways are very similar to his current speakers. For the panels I am using a tube amp that was designed for these speakers, but barely made it to market before Innersound closed. I had tried several different solid state amps, but never was captivated like I am with this combination of tubes and electrostats. I believe there are a few tube amps out there that can deal with the extreme impedance dips. One that I thought was fantastic was David Bernings OTL. Not sure of the model, but it was a 70 watt stereo amp, and had no trouble driving the Kayas. I've also heard that the CAT
Amps can handle them. Good luck in your search
Carl
Amps can handle them. Good luck in your search
Carl