I once owned 3.6s and loved them. I made a huge mistake in selling them. The main requirement is a fairly powerful high current amplifier that will comfortably handle a 2 to 3 ohm load. Thiel often recommends Classe, though I personally have never heard the conbination. Krell would also be an excellent choice as noted above. Before making a final decision, you should speak directly with the amplifier manufacturer and obtain definite information about the ability of their product to drive such a difficult load.
Thiel 3.6 s and amplifier choices
I recently purchased Thiel 3.6's. Currently driving them with an Aragon 4004 Mark II. Other equip is Arcam FMJ23 Cd, VPI TNT, and Krell KRSII preamp, FMS Grey cables and old Audioquest Interconnects. Looking for suggestions on amplifier as I think there is a lot more to be had out of these speakers. Balance is slightly tipped up due to mid bass leanness but they do so many things right. Any thoughts.