Alpine SWA-12S4 BassLine Series 12" 4-ohm Subwoofer | Auction 192 TV's, Small Appliances, Name Brand Electronics, Car Audio, and Misc. Products | K-BID
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Alpine KTA-200M Mono Power Pack Amp with Alpine W12S4 12" Subwoofer and Bass Knob - Creative Audio
2) ALPINE 750W 10" BassLine Series Single 4 ohm Car Subwoofers (Pair) | W10S4 | eBay
Alpine Bassline Dual 12″ Sub Box + Mono Amplifier | ACS - Online Store
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Alpine W12S4 BassLine Series 12" 4-ohm Car Subwoofer - Pair