Bryston 4B3 vs Mac MC462 vs Pass Labs X250.8, OR... GRYPHON Diablo 300?

I have a Pass 250.8 + SimAudio 740P preamp combo which I really like.  About a year ago I changed speakers (switched from Magico to Spendor) and the 250.8 was chosen as it mated very well with the Magicos (e.g. lots of power and a little warm sounding).   Over the last summer the heat the 250.8 puts out into my listening room (with no AC) was getting me down so I thought about swapping amps since the Spendor D9s I now own are easy to drive and not as lean sounding as the Magicos.   I figured I could maybe save some $$$ and not have to deal with the excessive heat the big Pass puts out.   The Bryston 4B3 was my first choice to try as it is very well reviewed, bulletproof, and I'm a previous Bryston owner of multiple pieces and a big fan.

I purchased a used 4B3 and dropped it into my home system after disconnecting the 250.8.   It was everything I read about, great bass, fast, smooth, very revealing.   Compared to the Pass I found it had a more forward and detailed sound, but it was still smooth and not bright.   Just a different perspective.   With my D9s I think it even had better bass then the 250.8.   Side to side soundstage was about the same. 

Where I found the 250.8 beat it to my ears and tastes was in the front to back soundstage and the feeling that the instruments and people were more real or 3D like in my listening room.   The 4B3 sounded like an amazing 2D ultra detailed recording, the 250.8 sounded like the real thing because of the extra space and depth in and around all of the sounds.    I ended up keeping the 250.8; in my system its output with good recordings just sound so much like live music (maybe a handful of rows back though).

Good luck with your search...

Thanks for sharing your experience, and you comparison of the Bryston vs Pass.  

Will be be very interesting to see how the Gryphon Diablo 300 compares....

I just want to hear some Gryphon gear.  Looks cool, is very expensive apparently, and is considered ultra high end.

Gryphon is not dark sounding. It is deep dense articulate and powerful. No brightness and low distortion. This is top solid state level, and it should last for decades. I don't even consider any other transistor amps, makes little sense to me. I would probably be after older Gryphon separates, though, but very expensive and hard to find. Gryphon separates is an answer to audiophile's prayer.
Some Pass are very good, so what ? Bryston is not high end.

Keep in mind the MC462 makes 450watts into 2,4,8ohm, the Gryphon can output 950watts into 2ohm so with your more 4ohm ish speaker the Gryphon might have more control plus their Class A/AB biasing delivers tons of current. Because in my experience in the past with Wilson and Rockports which drop to 1.73 ohm for certain sections of the bass region that Mcintosh solid state doesn't sound as dynamic till you start looking at 601 monoblocks.  I am considering the Gryphon also since they are one of the manufactures that is used when voicing my Rockport Speakers, plus adding Phono and/or Dac saves the cost of 2 expensive cable per device and less potential for ground hums and issues if you are into vinyl.  I am considering Devialet 220 Expert Pro, 440 Expert Pro or higher also.   I can't speak on the latest pass or Bryston. Look forward to hearing your results and next steps.