I went through a merry-go-rough of power amps a few years ago (ATI1502, Bryston 3B ST, and class D amps from PS Audio, W4S, Crown, and Class D Audio), but I kept coming back to a 20+ year old Harman Kardon PA2200. It cost $100, drives my Shahinian Arcs as well as anything I've tried, and has a...