Had CS 3.6 for many years and of all the amps used the best match that I came up with were the Krell KSA and MDA series amps, A Krell KSA-250 was a staple for quite a long time with the Thiel CS 3.6 Detail and absolute control of the 3.6 was high on the list and the KSA-250 did not disappoint. They dipped down into the 2 ohm range but that never phased the older Krells. Even a KSA-150 works well if your room is not too large or you don't push to a ridiculous dB level. My old room was rather large so the KSA-250 and MDA-300's had more reserves for large dynamic swings. Power output from the 150 and 250 was - 150 w > 8 ohm 300 w > 4 ohm 600 w > 2 ohm
If your looking for a great amp for the Thiel CS2.3's check out a McIntosh amp like the MC352 or MC452, these amps are stable down to 2ohms and don't run HOT, like some pure class A designs. Either of these two amps are of super high quality and are built like battleships and sound even better, probably the last amp you'll ever want or need.
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