Product Overview The ERD-8 is a UL Listed, 262 CID, stackable, steel loudspeaker backbox with a molded polystyrene damping pad fitted to the inside top of the enclosure that has four (4) welded, tie-off straps. Main Features In-ceiling 12 5⁄16 (Diameter) x 4.25 (D) 262 cubic” (CI) Show More Show Less
