Quam-Nichols BB2/B Beam Mount Speaker Assembly - Black - USED (NOTE: Item has been sitting in storage and has some paint chipped off as well as dust build-up that could not be cleaned out of some of the crevasses. See photos for reference.) The BB2/B Beam Mount Speaker Assembly from Quam-Nichols features an 8" O.D. full range speaker, 25/70.7V transformer with wire leads, perforated 22 gauge steel baffle, 16 gauge steel back box, and 2 beam clamps. The 8C10PAX is an 8" O.D. dual cone loudspeaker with a 10 oz magnet and an 8? nominal impedance. The BR8WS is a 22 gauge steel, round speaker baffle with 4 welded 8-32 x 1? studs on the back surface. The ERD-8U is a round, steel loudspeaker back box with 2 snap-in straps. A circular, molded expanded polystyrene damping pad is fitted to the inside top of the enclosure. Black baked epoxy hybrid finish Mounted to a steel I beam of 5.25" maximum width, downward firing in an indoor environment Used when program materials include signal tones, voice, and music RoHS compliant LU IBEW 1031 listed Made in USA SHELF: 58 C.M