krell FPB300 or jeff rowland model 7

what about mark 332.5?

332.5 is another really good amp. I heard the 331.5 which is approx 80% the 334. Personally I would rather have the Levinson than all the ones you mention. I have owned the 27, 27.5, 29, had the 331.5 in my system, and a buddy has the 334. The 334 bests all of the other ML amps I have heard.

There are better amps you can get for the price of used FPB300 (~$2700). Pass X-250 is one of them. I had a chance to compare them side by side in my system - Pass is by far much more transparent, open on top, soundstaging is much better etc. They are just not in the same league.

Interestingly, the X-350, doesn't sound as good as X-250 IMO.

The other amp worth investigatong is Cary CAD-500MB. You can get one used below $3k if you are lucky. It is even better than the Pass X-250, and MUCH better than FPB-300 or X-350.

See I disagree with Elberoth2. I didn't care much for the Pass X250 in my system and like the Krell better. The Pass was too resolving and fatiquing for my taste. The .5 series is warmer from my understanding.

Please explain "too resolving".

I don't believe in an excess of resolution.

However, system incompatibilites are far more likely the issue.