The Bogen HFCS1 ceiling loudspeaker delivers superior sound and clear intelligibility in a variety of ceiling environments. The system can be easily installed in hard-surfaced ceilings, suspended ceilings, and new constructions. The HFCS1 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 high intelligibility and exceptional low-frequency response for both music and speech reinforcement. The loudspeakers consists of one 6-1/2" (nominal) low-frequency transducer, one 3/4" (nominal) high-frequency transducer, and a filter network for dividing frequencies between the transducers.