Best Class A amp with SLAM

Probably true.

Amp + speakers both matter. Biggest baddest amp + biggest baddest most efficient full range speakers with slam to match probably wins in the end. COuld be a commercial system geared towards a large venue or arena most likely and overkill for most any home.

In most peoples homes, even with larger rooms and higher volumes, it might be impossible to determine the best amp or combo in that many could test one's slam tolerance in practice. It's just a much smaller scale problem there.

I have to say that with Audyssey pro I can play so much louder than without would be possible. It is a way of freedom what is priceless.

I will agree-the Pass Labs are more musical, but I don't think they're as quick as the Krells. I may seek out another set of the KMA series and have them re-built. When you open up the KMA amps, they're built like a tank. I think you could literally throw them off a cliff, brush 'em off and they wouldn't miss a beat. For all you Krell experts, is there any other model you think is as good as the KMA series?

Well, it's not a bad idea to stick with what you know. If you're more comfortable with the Krells, so be it.

Agree,
If Krell suits you best, that's the choice to make.