Not trying to toss a grenade into this thread but I used Chord amps with my Graham, LS5/9 - there was nothing better. Didn't try Luxman or Accuphase (both excellent choices though) and no Pass. Tried Hegel, Electrocompaniet, Audiomat (integrated) & Mac and the Chord was just a fabulous fit for me paired with an Aesthetix tube preamp. Just my experience. Hard to go wrong w/BAT or any of the above mentioned brands even with the bigger Harbeths.