What is the best solid state amplifier you have ever heard?

@stevea11757 
Are the  Pass 260.8 monos really good - i.e., tone, body, drive?  They are sort of on my short list of amps to consider but would be a downward move in power for me.  Are they warm, lean, neutral?  How about resolution?  Do they have a lot of drive for inefficient speakers....not crazy hard to drive but like 86dB efficiency, a minimum impedance of 3 ohms, and a fairly innocuous phase angle?  I would appreciate any feedback you care to share.

Spectral is a line I wanted to be impressed with, like Pass, and I just haven't. They do not bring me joy.

@dpac996 You are a lot smarter than me. I went to audition the 509x and liked it a lot. The c900+m900u were both sitting there unused and I gave into weakness and asked to switch the speaker cables onto the separates. Big mistake for my financial well being. I am buying the m900u but not sure about the c900u.

I have read online or heard back from users and dealers the following to use with the m900u:

* c900u it the best match for the m900u
* Mola Mola Makua + m900u is better than with c900u
* Linn preamp is a great match with m900u

They replaced a Levinson 333, and in my system they are about as good as it gets for me.My speakers are Shahinian Hawks, I believe 89db and they drive them with ease (4 ohms as I recall but don't quote me), ARC pre, PS DAC/Transport, Magnum Dynalab 809 Internet Tuner and PS P12. Minor tweaks to power cords and thats it. Blows away the Levinson, again, in my system

GamuT M250i Monoblock.