No studs(joists) in the ceiling? what's holding the floor and the drywall up? did you use a stud finder?
The room is in a basement, recessed ceiling. I have no idea what was done during construction (it was part of an addition), but I couldn't find a stud anywhere near where I was trying to ceiling mount the QS8's.
I originally didn't want to mount the QS8's on the back wall because I was worried that they wouldn't sound good. However, I decided to try it anyway when I wasn't having success with hanging them on the ceiling. They sound surprisingly good, even though they are against the back wall as opposed to facing the listening area.
Nick, thanks for the tip about the Toggle Bolts. I'll have to try hanging the QS8's from the ceiling again when I've got the time.
Here are some pictures of the final results. Sorry about the low quality, they are camera phone pictures (I didn't feel like taking out the Canon).
