XTC 12" Speaker Baffles
Crutchfield Customer Review (What's this?)
I actually used these behind my recessed ceiling speakers for my home theater system. It works great for keeping the loose insulation from falling in the living room if you have to remove them after they've been installed. I also installed the smaller size baffles in my truck doors and love them. They keep the speakers so clean and sheltered from moisture.
Pros: weight, price