JL Audio 12W3v3-4 | 500W Peak Single 4-Ohm Subwoofer
Amazon.com: 10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs - SBA10A : Electronics
JL Audio 12W0v3-4 W0v3 Series 12" 4-ohm subwoofer at Crutchfield