I have an A/B amp that is biased pretty high into Class A, and my speakers are a real easy load. With this setup, I’m in Class A much of the time, and when I’m not, I honestly can’t hear it.
From my perspective, it all depends on the amp implementation, listener preferences, and choice of speakers. I’ve had pure Class A amps cycle through the system, and I haven’t heard anything that would convince me to give up a *well-designed* A/B amplifier. BUT that’s on MY system. If the speakers were a lot harder to drive, and I listened a lot louder, then I probably would have gone with a Class A behemoth like a big Pass or Boulder.
To answer Don’s original question: Though I think he need an amp with some serious cajones to drive his Eminents, I would probably stay away from that Krell. Only problem is, most pure Class A designs are gonna cost a good deal more than 2k, even used.