I have QS8s with floor stands in a room that is about 20' by 24'. Actually the room is wider than 20', probably closer to 32' but we don't watch TV from over there.

The QS8s work great.

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV