I am surprised everyone is saying he should be finding studs for QS's? I mounted 4 QS4's in my room and 4 QS8's into my fathers room using drywall anchors. I used the kind of anchors that are threaded and designed to screw into the drywall themselves. They are the plastic white ones that come with the screws for hanging pictures etc... 3 anchors per speaker did the job and no trouble what so ever. Two years and hanging strong.
Dont think you need to find the studs. Place them where they will sound the best not where your studs tell you to place them.
