If you can fit them I don't see why not. your AVR's room correction will level match.Im setting up my HT in a single story garage with a picthed roof. The roof area is empty so I can do anything. I was initially going to put up 4 MTX 8inch circular speakers. But im thinking i have some large 1 foot bookshelf speakers Mission 701. I was thinking of fitting them in the loftspace facing downwards. They would be much louder and bassier but less diffused that regular ciecular speakers. For looks i would make a thin grill frame over the ceiling area where the speakers are facing down. In term of performance is this a good idea or shall i stick with the MTX's ??? I have 4 701's already that I can use. The rest of my speakers are very large Mission 70 series.