The Blue Line Series 6.5 In-Ceiling stereo speaker is designed to be used in spaces where a pair wont fit or isnt necessary, such as in smaller rooms or rooms rarely used in the home. Left and right channels are both wired to this speaker eliminating the need to install two separate stereo speakers. Its optimized for whole house music distribution and is moisture resistant for areas such as the bathroom or porch. It features a dual voice coil poly woofer, two PEI mylar tweeters, and foam gaskets, which minimize vibration and provide an air tight seal. Installation is also made easy by the use of self-centering screw heads and compatibility with the On-Q Pre-Construction Speaker Brackets.