ALPINE R2-W8D4 8" SUB 1000W SUBWOOFER DUAL 4-OHM BASS CAR AUDIO SPEAKER NEW | eBay
Alpine SWE-1242 Type-E 12" 4-ohm subwoofer at Crutchfield
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Alpine SWT-10S4 1000W 10" SWT Series Single 4-ohm Shallow Mount Subwoo – absoluteusa
2 Alpine SWT-10S2 Car Subwoofer 1000W 10" Single 2-ohm Shallow Mount S – absoluteusa
Customer Reviews: Alpine SWR-12D4 Type-R 12" subwoofer with dual 4-ohm voice coils at Crutchfield
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Amazon.com: Alpine SWT-10S2 10" 1000W Peak/350W RMS Shallow Slim Truck Car Subwoofer Bundle with Rockville Rock Everywhere Portable Bluetooth Speaker/Waterproof/Wireless Link : Electronics