Quam's SYSTEM 18/B/MP 1' x 2' 70V Rotary Select, Ceiling Tile Speaker (Micro-Perf Black) is a complete shallow depth, lightweight loudspeaker kit with a 4" O.D. woofer and 1" HF dome tweeter, multi-tap transformer, perforated steel baffle and integral molded 711 CID fiber enclosure. Cable clamp is included; four (4) seismic tie-off points. No assembly required. Includes one 24""T" bar to finish edge.