If you're installing your Polk in-wall speakers in a new home under construction, use Polk's Performance Enclosures for the best possible sound. This "in-wall cabinet" is the ideal size for Polk's LC65i, TC65i, or LC65fx in-wall speakers. The engineers at Polk carefully designed the enclosure to enable the speakers to achieve optimum low-frequency response. The rigid MDF construction keeps the bass tight and clean. Polk provides brackets, gaskets, and the hardware needed for installation.