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 :
MTX RTP8A 8" 120w RMS Powered Subwoofer In Vented Sub Box Enclosure+Bass Remote | eBay
MTX RTP8A 8" 120w RMS Powered Subwoofer In Vented Sub Box Enclosure+Wire Kit - Rockville Audio
MTX T812-44 Thunder 8000 Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
MTX 12 Inches Subwoofer | Sub Woofer Speakers | Croooober