Alpine
Alpine (ALPINE) powered subwoofer 20cm under the seat-mounted SWE-1080
Polk Audio
Polk Audio PSW10 Powered Subwoofer | Black
Pyle
Pyle 8-Inch Low-Profile Amplified Subwoofer System - 600 Watt Compact Enclosed Active Underseat Car Audio Subwoofer with Built in Amp, Powered Car Subwoofer w/Low & High Level Inputs - PLBX8A
H YANKA
H YANKA SODA-10ASW 480W 10 Inch Compact Underseat Car Subwoofer with Built-in Amp, Slim Powered Subwoofer for Car/Truck/Jeep Audio