The QS surrounds are very forgiving on placement, based on the way the in-phase drivers fire up/down/left/right. Your room is not the ideal setup for home theater, however, I've seen a lot worse. You will be able to adjust the levels of the surrounds so your left one compensates for the further distance. On the other hand, putting them on the wall behind the bed, as far apart as possible, and maybe slightly pointing downwards would work also. A Powered sub, drives it self with its onboard amp, it will not suck power from the receiver. Depending on your house layout, any sub will be heard throughout your house, low bass likes to travel. Think about when your sitting in your car, and you hear that annoying thump, thump, thump, dang that drives me nuts
