MB Quart Discus Subwoofer: Feel the thunderous impact of low-end audio as you crank up the bass with a 10" thermal-formed polypropylene cone that delivers quality sound at high volume levels. The vented aluminum former promotes cool performance. | Mb Quart | | Discus 10" Dual-Voice-Coil 4-Ohm Subwoofer | Black | Best Buy