FWIW, I contacted Thiel on this question exactly (comparing the 3.7 with the 7.2). Their answer was that the 3.7 was an improvement in all areas over the 7.2 except in bass depth and large dynamics. In frequency response, clarity, spatial fidelity and efficiciency they believe the 3.7 is the winner. OK, that's their view.....they still don't expect to ship for a few weeks but Crutchfield are now taking orders :)