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Amazon.com: Pyle Bandpass Enclosure Car Subwoofer Speaker - 500 Watt High Power Car Audio Sound Component Speaker System w/ 10-inch Subwoofer, 2" Aluminum Voice Coil, 4 Ohm, Ported Enclosure System - Pyle PLQB10 : Electronics
DS18 SQ82A Amplified 8" Car Audio Subwoofer with High End Aluminum Enclosure 1200 Watts
Amazon.com: Jovial 12-Inch Carpeted Subwoofer Tube Speaker - 500 Watt High Powered Car Audio Sound Component Speaker Enclosure System with 2” Aluminum Voice Coil, 4 Ohm, Rear Vented Design - PLTB121 : Electronics
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Carbon Series, Brushed Aluminum, Dual Vented – Atrend USA
Dual 8" Loaded High End Aluminium Subwoofer Enclosure 300 Watts Rms
Atrend 15SVR Single 15" Real Brushed Aluminum Vented Subwoofer Enclosure Box | eBay