Hawk, welcome. You say "rear surround", but are you referring to side surrounds in a 5.1 setup or using the QS8s as back surrounds on the 6th channel of your 5560(or 6th and 7th channels of a new receiver)? For side surrounds they might possibly be mounted on the underside of the beam and widely separated, pointing downwards with the tweeters at the sides and midwoofers pointing front and back. For back surrounds you should find a position for them at least 5' behind the listening position so that there's room for the back surround effect to be experienced.
