Pass X-250.5 or McIntosh MC402?

I have a long (35 year) history of using McIntosh amplifiers. Of course I have bought and borrowed a number of others in an effort to find something "better". I recently sold my McIntosh MC 300 and bought a used Pass Labs 250.0. I read so much about its full , natural organic sound etc. Between professional and consumer reviews, it really sounded like what I wanted. All that I can tell you is that in my system, the Mac was smoother, fuller, and simply sounded more like music to me. It is undoubtedly a superior amp, but I guess that it just proves once more that you need to listen before you buy. It isn't possible to know what sound a person is referencing in their mind when they describe a components sound in a relative way to another component. I also believe that part of my reaction is based on the fact that I have used McIntosh amps for so many years that they sound more correct to me. In any case, I plan on buying a MC 402. I know that I will love it. As a sidebar, I discovered that the Pass amp had an amazing synergy with the Nestorovic speakers in my second system.

Actualy, I tried X250.5 in my listening room but with N801D. Beck then I was really satisfied. B&W diamonds have more natural overal presentation and I dont know what sinergy I can expect with aluminum tweeter?

This could be a tough call Srdan as it could come down to preference, both are fine amps. I would suggest that if you heard a particular combination that you liked, Pass and B&W, I would suggest that you pursue that as you know that you liked it and that is what matters most.

Good advice. I think I'll try side by side demo...

I don't think X250.5 will be optimal for your N802s.
I drive N803 with an X250.5 and it is just wright.
You'll need at least an X350.5 or if you go with McIntosh, then go for the MC501 monoblocks. Don't bother with the MC402 because it won't provide the proper drive for the N802s and they may end up sounding lean in the bass and with tilted up highs actually with both the X250.5 and the MC402. You need more power for these speakers.
Pass X350.5, MAC MC501, McCormack DNA-500, or may be one of the bigger Classe amps.