LT background music / paging speakers 4" 15W (Lay-in Speakers)The LT speaker system is available with driver No. JR410 (4 in. 15W high compliance) for paging and background music. System includes the factory wired driver with transformer (choice of two), 1x2 ft. frame with fine perforation grille, and 0. 147 cu. ft. acoustic backbox. Ships ready to install. Click each Model for Data Sheet Model No. Assembly Size Driver Transformer Backbox LT 410 72 BB 1 x 2 ft. JR410 TLM 572 0. 147 LT 410 870 BB 1 x 2 ft. JR410