Alpine S-Series 12" Dual 4-Ohm Mobile Subwoofer - S-W12D4
Alpine 12 inch 1800W Active Car Subwoofer for sale online | eBay
Alpine R-W10D4 Type R 10" Dual 4 OHM Subwoofer with GTR-601 Mono Subwoofer Amplifier 600 watts RMS x 1 at 2 ohms - Creative Audio
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Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer
Alpine® Type R 10" Black Car Subwoofer | Hi-Fi Systems