krell FPB300 or jeff rowland model 7

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.

The Pass is too resolute for my system. The BAT sound matches my speakers much better and my speakers (Tyler Acoustics) are not bright at all. I consider them fairly neutral.

I understand excess of resolution but it can be fatiguing in some systems. I feel the Pass X250 would match warmer or darker sounding speakers.

One more time.

There is no such thing as excessive resolution.

You have either system or personal preference issues.