Alpine SWT-12S4 1500W Max (300W RMS) Single 12" Sealed Subwoofer Tube Enclosure : Electronics - Amazon.com
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Alpine SWT-12S4 1500W Max Single 12" Sealed Car Subwoofer Tube Enclosure 793276242525 | eBay
Amazon.com: Alpine Bundle Compatible with Universal Car S-W10D4 10" Subwoofer Dual 4 Ohm with S-A60M Class D Subwoofer 1200W Amplifier, and HA-AK4 Amplifier Install Kit : Electronics
Amazon.com: Alpine SWT-12S4 1500W Max (300W RMS) Single 12" Sealed Subwoofer Tube Enclosure : Electronics