I own Thiel 3.6s, not even in the same leage as the big 7s but I'd caution you about using a McCormack amp with Thiels. They are current limiting and might make the Thiels sould very bright. Compare the impedence curves of the two speakers. Thiels generally dip to about 3.6 ohms and unless your amp can deliver exactly twice the power at 4 ohms rating as it does at 8 ohms you are likely to be unhappy. If you are looking for a tie breaker between speakers this might be it. I love my Thiels but these $4600 (new) speakers and being driven by a Krell KSA200s ($8500 new) amp.
