Jafant, yes I have seen both the 2.4's and 3.7's.
I think this might be a matter of perception rather than reality, or perhaps a visual aesthetic concern.
All of Jim Thiel's CS designs have basically the same dispersion characteristics.. Though the footprint varies a small amount, all the Jim Thiel CS models have the same basic placement guidelines. In my conversations with Thiel regarding placement, they said that the recommended distances should be measured from the back of the woofers. As the Thiels are time aligned that would be nearly identical to the more obvious tweeters. Even if we were to get especially persnickety; though the 3.7's have larger woofers, with perhaps a larger magnet and motor assembly, those woofer faces are also by design shallower in depth. The distance from the back of the woofer, back wall, side wall, and listener should be nearly identical with either 2.4's or 3.7's. The only other concern regarding room capability would be bass output; again they are nearly identical. The difference in weight has no bearing on room compatibility, unless of course the floors are can't bear the extra weight, which to my thinking would be cause for a different and much more important concern.
