Do Thiel Audio CS3.7 Rock?

I think you can do better for that kind of money.

Thiel 3.7's, which I own, are speakers for those who prize transparency over other qualities. They are most definitely not bright and I think that using them with less than 200-250 wc high current amps will not allow them to sound their best. If you are asking whether they rock, it seems to be you are asking a question that indicates these speakers are not for you. In the same used price bracket I would look at Wilson sophia IIs for bass dynamics.

In Europe I can get the B&W 802 Diamond for about the same price as Theil and know these do rock. I have never heard GamuT speakers but they are a bit more expensive. Has anyone else heard them. I'm trying to get a short list before going to audition as it would probably be in the UK as prices are lower there.US speaker like Wilson and Vandersteen are stupid money here

I also toyed with the idea of adding a couple of subs, possiblly Velodyne DD-10, as the Esoterics do sound good on simpler music.

I finally heard a pair of 3.7s at RMAF last month, driven by Rowland electronics. They sounded excellent to me. Although I recognize the pitfalls of hearing an unfamiliar speaker driven by unfamilair electronics in a hotel room, I would rate them among the better speakers I've heard. They should sound excellent driven by Ayre electronics. Regarding the "lack of bass", I think that is merely relative to other, more expensive speakers (some of which exaggerate bass, eg, Wilsons). If you look at Stereophile's in-room measurements of the 3.7, there is useful energy (-6 db) down to about 25 Hz. That's plenty good enough for all music types other than pipe organ.