13W7AE - JL Audio 13.5" Dual 1.5-Ohm  10th Anniversary Edition W7 Series Subwoofer 13.5" subwoofer with dual 1.5-ohm voice coils Polypropylene W-Cone with polyester foam surround Top-mount depth: 10-1/2" Sealed box volume: 1.875 cubic feet Ported box volume: 2.375 cubic feet