The Thiel 3.7 is very a interesting speaker, though I think the use of 1st-order crossovers is an old-fashioned marketing gimmick, and their use results in some rather difficult to resolve design compromises.
The fit and finish of the Thiels are equal to the best on the market, and significantly better than the Revels, IMO. Like the Revel they use purpose-built drivers. I like that; it's a sign of more complete engineering, especially with that crossover strategy.
When I listened to the 3.7s I came away with two impressions relative to the Revels: the highs weren't as good, as in not as realistic, and the bass lacked dynamic range. If you listen to vinyl or at relatively low levels the 3.7 is probably just fine in the bass, but for digital like I listen to I found them wanting, compared to several other speakers. Some people would say these aren't speakers for rock or organ, or perhaps even for contemporary jazz.
Since I listened to the 3.7s at a dealer (I've heard the Studio 2 in a home) it's difficult to compare exactly, but I thought the Revels threw a better image.
Of course, if memory serves, the 3.7s are 20% less expensive than the Revels.
