Class A multi-channel amp?

Why? Do you need to heat your house? Or maybe build up your biceps.

Seriously, putting even two Class A amps on a single chassis doesn't make sense.

Sean...Digital amps (like the Carvers I just bought) are often described as having Class A, and Tube amp sonic characteristics. What is the basis for this? Perhaps the characteristic spectrum of harmonic distortion is similar.

I am at the boundry of electric service by two utilities: Mass Electric, and Western Mass Electric. Would my channel separation be improved if I plugged one amp into each grid?

sean...I have heard it said that conventional testing techniques get screwed up in ways that I don't recall, when used on digital amps. Who knows?

"Less control of the drivers" means higher output impedance. That I can understand. But what does "slower response time" mean. Surely response time is defined by slew rate which is indirectly specd in terms of frequency response. HF response of tube amps is limited by transformer performance, and PWM digital amps do use filters to remove the switching artifacts, whereas conventional SS amps have to have a small inductor at the output to avoid becoming radio stations. So the digital amp may indeed roll off above 20Kc like a tube amp.

It is the stated intent of the zr1600 designers to emulate tube class A sonics, and several reviewers have suggested that the goal was achieved. I don't have a set of 600 watt class A tube amps handy for comparison, so I suggest that you lay hands on one of these digital amps and see for yourself. The cost will be less than the wires to hook it up!

sean...The Carver amps, and some others, but not the Spectron, reportedly use variable ("spread spectrum") pulse width up to more that a megacycle, and this somehow means that the supersonic filter can be less abrupt. Do you have any further clarification on this?