As is the case with many things, it's hard to describe.
Let's start with the obvious:
It's very pleasant...and that's not a 'damning with faint praise' comment.
Pleasant is good.
The bass is a bit, 'rubbery' if that makes any sense...a bit lose with the overall impression that it's not plumbing the depths...a little heavy in the midbass...not as tight as it should be tonally.
Background, very black...midrange very nice...if not a bit 'forward'...remember the 'absence of one, is the prominence of another'.
The highs...softish, not articulated, in my experience...but NEVER fatiguing.
Forgiving but not syrupy...sounds about right.
Actually, with some of the THIEL'S, interestingly, the Mac sounds nice...good offsets for one another.
If we could agree that Spectral is a bit dry sounding, clean but dry, we have some common ground.
Classe...more musical and very Threshold/Pass Labs sounding.
Krell, thunderous bass, a bit grainy (my main objection) in the mids and upper frequencies.
What's fundamentally right about the Gryphon...I notice NOTHING as it relates to these regions...I'm only hearing what passes for music 'for ME'.
I've heard Gryphon with THIEL, Logan, B&W, Nearfield Acoustics Pipedreams, PSB, Rega, LSA...almost too many to mention...and it's character or musicality always outshines any perceived color for me...just musical, without the pejorative connotation one normally associates.
Without those niggling little problems or issues, the rest just falls in place for me.
Gryphon is in a league almost by itself for my taste...MBL offers a very, very similar sound...with a slight, and I do mean slight...did I say slight? lack of that final ounce of resolution?
Having said that...they're as close as you'll hear, as if the same guy and suppliers are at work here.
If this does NOT make sense, I apologize...subjective analyses, are always hard.
Hope this helps a bit.
Larry
Good listening