I have the itch to upgrade my QS4's to QS8's, but I've been concerned about placement. Right now, my right surround is mounted above the door, giving 6" clearance for the top woofer to bounce off the ceiling. Both surrounds are even with my listening position - 90 degrees - and I'm really satisfied with how they perform in that position. If I upgrade to QS8's, there will be only about 4.25" clearance from the ceiling. Does anyone think that I have any cause for concern?