Hello,
I had the CLS2Z for about four years. Most of that time I drove them with an ARC VT130. I also tried the Pass Alpha 100 watt mono-block and thought that worked extremely well with the CLS2Z. One thing to remember regarding usage of tube amps, because of the difficult load they put on the partnering amp, they eat through output tubes real quick.
I find it funny (odd) that the bass is an area of performance that the CLS got criticized for by most people, and in a certain aspect of bass performance I believe rightly so, but at the same time, I always felt that the bass that was there was some of the most detailed, quickest, transparent bass I've yet to hear. I think that revealing nature of the CLS bass performance was the hardest thing for me to get past when moving on to other speakers.
best,
Tom
