Source 12 inch active car audio powered subwoofer box system built in amplifier car speaker enclosure on m.alibaba.com
Amazon.com: DR DOUBLE ROCK 8 inch CB08 Underseat Subwoofer Car Audio 600 Watts 8 '' Slim Powered Subwoofer with Built in Amp Active Compact Subwoofer with Amplified+Bass Volume Control Knob : Electronics
Source 10 inch/ 12 inch Compact Car Active Subwoofer Enclosure Car Audio Powered Speaker Box with Built-in Amplifier on m.alibaba.com
Amazon.com: AUDIOTEK 10 Inches 1000 Watts Peak Power / 500 Watts RMS Slim Under-Seat Active Power Audio Car/Truck Angle Trunk Box Sub-woofer SUB/Supply Voltage: 11-15V DC : Electronics
BOSS Audio Systems BAB8 8 Inch Powered Under Seat Car Audio Subwoofer - 800 Watts Max, Low Profile, Remote Subwoofer Control, For Truck, Boxes and Enclosures - Walmart.com
Car Audio Slim Active Subwoofer SBA10A – Pyle USA
10" ACTIVE SERIES SUBWOOFER 500 WMAX /150 WRMS – GENIUS AUDIO USA
BassLink SM2 | ["Add high-performance bass with a low-profile woofer enclosure", "Powered, 8\" (200mm) compact car audio under seat woofer system"]
Recoil SW10P Car Audio 10 Inch Active Subwoofer with Passive Radiator, Built-in 600W Amplifier, Include Remote Subwoofer Control and 8AWG Complete Wiring Kits - Walmart.com
Discontinued Obsolete SKU | MTX Audio - Serious About Sound®