Believe it or not, the 15 watt 300se SET drives the studios nicely. Bass is surprisingly rich and saturated sounding (hard to describe but sounds different than solid state bass). In my small room at small listening levels, the sound was excellent. The 805C, 50 watt SET, also worked well, and is obviously a better match. I didn't test much for loudness, so they may be not enough for some purposes, but for presenting the speakers at their best at moderate listening levels, the Cary SETS were just superb.