Zero feedback and class A,which is better?

That's a good question, and I'm hoping some of the amp manufacturers that lurk hereabouts will post a response.

Many SET amp manufacturers and at least one OTL amp manufacturer combine zero feedback and Class A operation in the same package (three of the six amplifier lines I carry have both characteristics, so obviously I voted in favor with my wallet). I think that Nelson Pass's "First Watt" solid state amps do as well.

I'm under the impression that the Aerius has a fairly nasty impedance curve, which can work against such amps. Can you tell us anything about the impedance?

Duke

You need some power with those speakers and VAC made some pretty high powered class A 300B push-pull amps that you can run with no feedback. There are probably others.

Ayre claims their SS amps are zero feedback designs but they mean no global feedback. Any SS amp has to use at least local feedback.

First Watt amps are current sourse amps and only work with high efficiency single driver speakers.

My Aerius speakers, are 6 ohms' but can dip down to 1.6 ohms.