DUAL SUBWOOFER ENCLOSURE; .75" MEDIUM-DENSITY FIBER BOARD CONSTRUCTION ; RECESSED SIDE PANELS ; PRE-CUT SPEAKER OPENINGS ; NICKEL-PLATED, ;SPRING-LOADED SPEAKER TERMINALS ; AUX;POWER CONNECTOR ; PRE-WIRED FAST-ON TERMINALS ; POLY-FIBER LINING ; CHARCOAL CARPET; 15"