'Dark'...would generally mean, 'lacking air' and a sense of unlimited upper bandwidth...not so, with regard to any description that I would apply to Gryphon.
When I hear live music...me, nobody else, as my experience is unique to me...I am not aware of highs and lows...or any bandwidth...just the music.
For my rather extensive experience with Gryphon...it captures this better than any other electronics I've heard...(solid state).
It simply makes what sounds to me, like music, without any of the fancy nomenclature we tend to apply to those uniquely satisfying moments of real music. It passes the information through the electronics, seemingly unchanged texturally...musically. Nothing is highlighted, nothing is front and center, EXCEPT the musical experience, if I may be so bold as to suggest that something like this is possible.
There are only a handful of pieces of gear that can do something like this...my preferential list...
Gryphon...Five Stars...wonderful
MBL...when set up right the full MBL system is magic...the electronics 'in the same league with' if not the same pew as Gryphon...but I still defer to the Gryphon.
Tubes...for my humble impressions, only VAC makes the cut here...and my praise for them is again uniquely mine...and does not diminish the value of ANY other product...to me, it is the Tube Alternative to Gryphon...as, after all, this IS all about the music.
Good listening,
Larry