I have run Response 2.5s with an 11a and it is a fine combination. The 11a is also terrific with the Thiel CS 1.6, but not with the 2.4.
Before getting new speakers, though, see how well your current system performs in the larger room. Sounds like the current combination is giving you plenty of magic, and you'd hate to throw the baby out with the bathwater. I don't know the 1SC; it's possible that it does some things you like much better than the 2.5 would.
Before getting new speakers, though, see how well your current system performs in the larger room. Sounds like the current combination is giving you plenty of magic, and you'd hate to throw the baby out with the bathwater. I don't know the 1SC; it's possible that it does some things you like much better than the 2.5 would.