I think they would work great. Less diffuse rear soundstage than the SR3s, but better IMO for multi-channel music. Optimum would be 5 CC3's, with only the center in a horizontal configuration, crossed to a quality sub. That would be choice.
If your desire if a more pointed surround, they would be great. They would send a signal a bit more wide than a conventional bookshelf, just because it is a center channel and the dispersion is different. I have been thinking the same thing and am using SR-3s now.
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