i currently own the hegel h590 as well as the pass int60, have many hours with each into my modded maggie 1.7i’s and stock 3.7i’s
i have heard the gryphon 300 at some length driving maggies but not in my own system
when i recommend the hegel h590 to buyers wanting a higher power integrated amp, i am doing so on absolute performance and performance for $ spent (call it value)
at $12-13k the hegel competes favorably with $30k dagostino’s, $20k gryphons and so on based on performance (sound quality, ability to drive touch loads effortlessly and so on), but of course, there are sonic differences among these amps and there are ’pride of ownership’ differences too -- exclusivity, bling factor, made in xyz and so on
there is no free lunch in this world, much less in a competitive marketplace, you give up a few things to get the performance with hegel compared to more exclusive competing products -- hegel comes in a plain wrapper, assembled in china
pass is made in auburn california, has a cool meter, dag has bling aplenty, gryphon looks like a piece of industrial art, made in scandivania -- folks with money to buy any of these can choose what they want, what makes them feel good about owning a certain piece of expensive high priced stereo gear
the pass int60 has a warmer sound than the hegel, which is steadfastedly neutral and resolving (not lean, not shrill, but neutral), papa nelson adds something to the sound of his class a units... driven hard, the pass will clip earlier and show some strain earlier than the 590
my observations from actually owning these units, take from these comments what you will
at 12-13K the hegel h590 (and its replacement) is fully competitive in performance to the other names mentioned, at $6-7k used, it is a steal... performance and value wise -- you want other stuff, the others are readily available too