I had four pairs of CLS's and a number of different amps. They love tubes like any of the ARC amps and they really love Pass Aleph 2's. The key with CLS's is to get the bass off of the panels by using a subwoofer below 90Hz so that there will be less IM distortion.
A friend of mine drives his with a Mark Levinson no. 27, and they sound fabulous. If you go solid state, it needs lots of power, those MLs go down to 1 ohm.
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