The bass on the Zeus, when being fed to the Von Schwiekirt VR4 was stunning. Large Chineese drums will make you wet yourself if you are not expecting it (then again, maybe its an age thing....). I know the sound of skin drums (my wife used to drag me to the Indian drumming sessions) and the Zeus captured it perfectly; the sound of the mallet striking the skin, the pressure wave building up, the explosion outward of the bass, and the decay into the room. Bass is a great mix of taut and resonant. Lots of presence in the mid-bass, giving excitement to music at a slight loss of transparency compared to things like ARC.
Soundstaging is very very good though it is short of that achieved by OTL amps (but...almost nothing matches OTL amps there).
This amp can convey the sheer MASS of an orchestra which, IMHO, ARC doesn't do as well.
Listening to Patricia Barber on this amp makes you want to order a brandy, like up a smoke and just kick back! (And I neither smoke nor drink!)