Thiel cs2.3

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    

250 w > 8 ohm
500 w > 4 ohm
1000 w > 2 ohm 

Thanks for all the help. I appreciate everything. 

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.

Matt M

^^^^what Matt said.  I’ve used 501’s with Thiels for years.

When a manufacturer claims that their amp is “stable” into a given impedance; all they are saying is that the amp won’t go into oscillation into that impedance, it doesn’t suggest how much power, distortion, or quality will be delivered into that impedance. Don’t assume the amp is truly capable of performing appropriately into a given impedance, unless they spec it as such. If the amp can deliver the goods; the manufacturer will brag about it.