Patent pending accessory kit that converts the DT12 and IDT12(-CK) into a 2'x2' lay in speaker. The DT12-2X2ADP includes two filler panels that allow the DT12 or IDT12(-CK) to be incorporated into the center of a 2' x 2' ceiling tile or in one half of a 4' x 2' ceiling tile. Necessary T-bars are also included for securing the panels and speaker to the ceiling grid.