Amazon.com: MTX TN8MS Terminator 8 Inch Micro Compact Amplified Subwoofer Enclosure for Small Vehicles with Class A/B Amplifier, Variable Bass Boost, External Bass Control, and Smart Engage Auto Turn On Circuitry :
Dual 8" Loaded Amplified High End Aluminium Subwoofer Enclosure 300 Wa
MTX 12 in. 1200-Watt Dual Loaded Car Subwoofer Audio Sub plus Box plus Amplifier plus Amp Kit TNP212D2 + AKS8 - The Home Depot
8" Active Amplified sub built in Amp Under Seat Subwoofer Enclosed Bass Box | eBay
Home Theater Design - The Passive Subwoofer Amplifier - Our Project Ideas
BOSS Audio Systems BASS10K 10 Inch Powered Under Seat Car Subwoofer and Amp Wiring Kit Package - 1000 Watts Max, 8 Gauge Wiring Kit, Remote Subwoofer Control, Sold Individually
Amazon.com: 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,Black : Electronics