If you think even QS4's are "too big", then I think almost any conventional box speaker is going to be too big. Just get some in-ceiling speakers and be done with it. Emotiva was having a sale I think, but I have no experience with their products. There is a school of thought that in-ceiling speakers are not of sufficiently high fidelity to warrant much fuss, and the Dayton ones at Parts Express seem to get good reviews. Good luck and have fun.

bibere usque ad hilaritatem