Channel Vision In-Wall Rough-In Bracket

Pre-Construction brackets are nailed or screwed to the studs or rafters before the sheetrock is installed. Their primary purpose is to indicate to the sheet-rock installers where (and what size) to cut holes for the speakers.

They are optional. If not used, you must secure the speaker wire in place between the studs or rafters, measure the exact location, then cut the speaker hole and retrieve the wire after the sheet-rock is installed.