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 :
Set 6 Coffers FOCAL - MTX Mini One Cooper R50-R52-R53 & Cabrio Brkt Front Car | eBay
MTX T812-44 Thunder 8000 Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield