Thiel 3.6, what will drive them best?

What qualities made you prefer the M200's over the HCA2200?

It was multiple factors. Sonically, both are excellent, but I thought the M200s were a little more neutral and warmer. The HCA2200 runs hot, indeed generates a good deal of heat which in the summer was an issue in my room. The M200s can put out heat too, but not as much. Finally, I prefer mono blocks for placement purposes, in most situations.

Thank you, the M200s are in the running. Heat is bad.

Ron

Regarding your question about bridging: if I'm not mistaken, most amps bridged require an 8 ohm load. With the 3.6s rated at 4 ohms (and averaging just under 3) that would be a very tough task.

One thought,
The McCormack DNA 1 is a fine amplifier that has stood the test of time.
It's WAY better than a number of the recommended amps with the Thiels and can be found on Audiogon for 900-1100.
A good choice that has been a proven match for the 3.6's

I agree with Jdolgin suggestion: I had a pair of dna-1 monoblocks that drove my merlin 4b+'s and ohm f's quite well; I highly recommend the dna-1.