Ray,
As you know, your Caravelles and my Summits are of similar size and configuration. My room dimensions are as follows: 20 ft 10 in x 15 ½ ft x 9 ft (ceiling height)
The single Rel Storm 3 placed in the room's corner sounds outstanding, and I've noted very minimal issues in terms of being able to localize it. I think I already emailed this to you, but if not, here it is again: the Rel Strata 3 review by Quadophile is absolutely EXCELLENT, and PACKED with solid information, in my opinion.
Bill