QUAM's SYSTEM 5/8/MP/B is Ceiling Tile Speaker (Micro-Perf Black) with an 8" O.D., full range loudspeaker, perforated steel baffle, and integral molded fiber enclosure; one 24" white "T" bar supplied to finish edge designed for Signal tones, voice and music. Nominal impedance is 8-Ohms. The SYSTEM 5/8 Series is a complete shallow depth, lightweight loudspeaker assembly with an concentric mount hard fiber HF cone, perforated steel grill and integral molded 617 CID fiber enclosure. Cable clamp is included; three seismic tie-off points. No assembly required.