The SYSTEM 5/8 is a complete, UL Listed, shallow depth, lightweight, 1' x 2' ceiling tile replacement loudspeaker system consisting of an 8C5PAX - 8" O.D. dual cone loudspeaker with a 5 oz. magnet and an 8 Ohm impedance. Molded fiber enclosure is 617 CID. Steel baffle with standard perforation and four (4) seismic tie-off points. Cable clamp and one (1) 24" "T" rail for finishing the edge are included. No assembly required.