Polk Audio PB-450 Pre-construction brackets for Polk 50-RT and 500-LS in-ceiling speakers

These pre-construction brackets are designed to hold Polk’s 50-RT and 500-LS in-ceiling speakers. Use the included wings to attach the bracket to ceiling joists before the drywall goes up. Polk provides brackets, gaskets, and all the hardware you’ll need to complete a quick and easy installation.