I don't recall which speakers I had at the time of the intruder, but I did own Accoustat 2 + 2s, sans sox (I loved the look) with 4! servo amps, which I slightly modified with the help of a fellow Accoustat lover+ the medallion interfaces. Although I tried a number of SS amps, I much preferred the servos, but they were very unstable. Long after I sold them I heard of a guy who was able to resolve that. I built adjustable outriggers which got them off the ground some 5" with fore and aft adjustment