I wish I had some hard info to pass along, Doug. The Energy C3s were one of the speakers I'd shortlisted when I was looking for budget bookshelves (another was the PSB Image B25), but I never got around to auditioning them. They're also a bit larger than the Classic Threes; it doesn't sound like you have any space issues like we do, though. I can't say enough about these NHTs, but what you have will probably be fine.

P.S. Just have to throw in that I'm listening to a live Ray Charles thing right now, Berlin, 1962. Boy, was his band a precision organization…