Amazon.com: Lanzar Low Profile Marine Subwoofer System - 1000 Watt 8 Inch Slim Active Waterproof Amplified Bass Speaker - Underseat Mount Audio Sound Amplifier Box, Marine Vehicles - Lanzar AQTB8 (White) :
S80 Low Profile Powered Subwoofer
STLF-18120DR | 18" 500W Cast Aluminum Frame Woofer (Low Frequency Driver) – Sound Town
Amazon.com: PyleUsa 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 :
STLF-10VS | 10" 200W Steel Frame Raw Woofer (Low Frequency Driver), 2" Voice Coil – Sound Town
10" Wireless Low-Profile Subwoofer Package with Dayton Audio SUB-1000L