CSUB Ceiling Subwoofer delivers superior bass reproduction in both suspended ceiling and drywall installations. The CSUB can provide deep, rich bass response to any speaker system. Perfect companions to the CSUB are Bogen?s HFSF1 and HFCS1/LP ceiling speakers. The CSUB offers several levels of power output controlled via a front-mounted rotary tap selector switch (under grille). The low-distortion speaker design, coupled with a computer-matched venting system, delivers exceptional low-frequency response for music. The CSUB design also features four integral swing-out mounting clamps that function as a tile bridge in suspended ceiling applications.