Celtic66 is dead on accurate. I owned CLSiiz's and used a vast variety of SS amps, namely Plinius SA250, BAT VK500, Pass Aleph 2 monos, but the best overall performance I experienced was after mating the CLS's to a pair of Manley Ref 450 mono's, that I of course acquired used. Those speakers came alive and sang with joy from power o' plenty!

