I have a pair of QS4s on home audition. So far they seem pretty good. I understand from this formum that there is little if any difference between the QS4 and 8s, the main factor being size of room. My room is 17 x 13 x 8. Anyone with experience with both of these surrounds? Which did you prefer and why? Is it sonically worthwhile to upgrade to the QS 8s in my situation? Compare performance with SACD/DVD-A? Thanks.