M6-10IB-S-GmTi-4 10" Marine Subwoofer Driver, Gunmetal and Titanium Sport Grille | West Marine
Amazon.com: 10-Inch Low-Profile Amplified Subwoofer System - 900 Watt Compact Enclosed Active Marine Underseat Car Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs - PLMRSBA10 : Electronics
JBL MPS1000 10" marine powered subwoofer at Crutchfield