There are several posts on the PS Audio forum stating how well the M700 monoblocks work with Thiel speakers, including the 3.7. If the M700s work well, then the more powerful M1200s should work even better. Both models are spec'd as solid down to 4 ohms and stable at 2 ohms, which still leaves a few questions about driving a 2.4 ohm speaker like the 3.7. However, one poster commented on how replacing a ML 533h amp with the M700s restored the powerful bass performance that had been present earlier when the 3.7 speakers were demo'd with mono Krell amps.
Just further food for thought.
Just further food for thought.