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Amazon.com: Customer reviews: Alpine SWT-12S4 1500W Max (300W RMS) Single 12" Sealed Subwoofer Tube Enclosure
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Alpine SWT-12S4 KTA-30MW RUX-KNOB.2, Alpine SWT-12S4 12" Bass System with Alpine KTA-30MW Mono Weather Resistant Tough Power Pack Amplifier and ...
Alpine SWT-12S4 12" Single Voice Coil 4 OHM Loaded Car Subwoofer Enclosure Black 793276242525 | eBay
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Amazon.com: Alpine SWT-12S4 1000w 12" Subwoofer in Bass Tube 4-Ohm Sub+Bluetooth Speaker : Electronics
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