Comp 15-inch (38cm) Subwoofer, 4-Ohm, RoHS CompliantDeep bass. The 2016 Comp Subwoofers give you deep bass and a great value. 15 Comp 4 Ohm DVC The 2016 Comp 15-Inch Subwoofer is a 4-Ohm speaker, built to deliver the bass you need. This sub offers a thick polypropylene woofer cone with 360-degree back bracing, and signature white stitching on a UV-treated surround. A large magnet, high-temp voice coil and bumped back plate allows the deep bass your music demands.