Okay I Bought the Magnepan 3.6's

I think the Pass 150.5 could definitely do it in your room. Depends on how loud you play your system. The difference might come down to the fact that the 150.5 would be out of class A into class AB, while the 250.5 might stay in class A, though if you play loud the 250.5 would also be out of class A.

Hard to say more than that, unless you had both amps and did a direct comparison.

thanks for the recommendations. I noticed that all three of the X150.5's listed have been sold!

Take another look at Bryston,both companies use each others products when on the show circuit.There is just a natural synergy when these amps and speakers are paired.
A 4BSST,14,and or mono 7's are ideal candidates.

Wait!!! Did you buy the Maggies new or used? If they are new you really need to let them break in for a couple of hundred hours in order to be ale to evaluate amps. The sound of Maggies changes significantly over the first couple of hundred hours and what you describe with the Mac could be attributed to them not yet being run in.

If you go Pass, I would go to the 250.5 or 350.5. I know with my 2.7's they didn't start to sound right until I had 600w/ch per side (4 ohm) going through them. Others have mentioned the big Brystons as they work well with Maggies, and I agree they are worth checking out. Despite what you get, I would make sure you are at least at 500 w/ch.

They are dealer demos, well broken-in... So, you don't think that a Pass X150.5 will do the job?

Yes, I will look at the Brystons too...