New construction brackets are typically used when the studs or joists are exposed before mounting the sheetrock or ceiling tiles. In addition to providing extra support for the speaker, the brackets let you determine the exact placement of the speaker while providing a template to cut the mounting hole. The aluminum bracket wings can be stapled, nailed or screwed to studs or joists. Sold as a single.
Each ceiling and in wall speaker uses different bracket and back box, please choose accordingly.