I just purchased a pair of 2.3's and I am powering it with a 3.2 amp. My room is 16' x 18' and the amp drives the speakers just fine imo. Actually this seems to be a great combination so far.
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I had the A3CR and Thiel 3.6's. I had upgraded from a McCormack DNA-1 amp- it was definitely a step up in terms of high end extension, delicacy, detail, etc. On the other hand, it was listed as 150w by Audio Advisor but was really closer to 120W into 8 ohms (a step down from the 175w of the DNA-1).
I have since upgraded to Classe CAM200 monoblocks, and there is no comparison- great improvements in bass extension, control, pitch, and ability to go much louder without strain or compression. I think part of the secret is that the Classe doubles its output into 4 ohms, while many other amps don't come near to doubling.
Admittedly there is a fair price difference between the two amps, but I finally found a way to make the 3.6's 'sing' with a bigger amp. The A3CR is a bargain for what it costs, but just won't be near the ultimate for Thiels' demanding load.
Best of luck in your search.
I have 2.3's that I power with the MF A308cr separates, an upgrade of 450W>4 ohms from the MF A308 Integrated I had for about 5 months, rated at 300W>4 ohms. I had to do the upgrade; no matter what I listened to, classical to jazz to rock to electronica to whatever, the ease and fluidity of this combination made me constantly want a little more volume. By the time it'd get where I wanted it, peaks would cause the A308 Integrated to break up with a very loud TICK sound from one or both channels. I have to have music loud enough to cause a physical reaction from me to really submerse myself in it, and it took more than the Integrated's 300 watts to do it. But I have to tell you -- the combo of the MF A308cr separates and the 2.3's (with my Velodyne HGS-II 12" sub) is a remarkable experience to listen to, no matter the genre. If you get enough juice to your 2.3's, they can and will improve the quality of your life!