Trance_Gott
Headphoneus Supremus
I think I read you had v280 before?
Your (solid state) headphone amp and headphone search has just come to its natural ending. No need to spend any more energy or money towards those any further.
Having said that, maybe the other parts of the chain may evolve further as time goes on as you may (or may not) see fit
ps: and that is mainly why my hekse is up for sale - it has no faults and is a superb headphone….but the susvara is better….and a few grand more
Does the Susvara has much more Slam with the us4 vs v280?