I’m not sure if something like this would work for you:
http://www.redhotcarpetcleaning.com/en-us/ez-moves-permanent-slides.htmlNot sure if you have carpet. which they work well on. Never tried them on anything else and not sure I would trust them not to scratch hardwood floors.
This could give you the option of leaving the couch against the wall for normal use and pulling it out to a better listening position for movies.
As has already been said the QS speakers work well just about anywhere but I can’t help but think having a little room behind your couch would help things sound better by allowing more room for the rear soundstage to develop whether you use 7.1 or 5.1.
If you follow sirquack’s suggestion to use brackets the “Full Metal Bracket” and the “Full Metal Ceiling Bracket” both count toward the 5 items needed for the %5 home theater discount. As was already said these bracket allow you the flexibility to angle the speakers for better sound.
