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Alpine SWE-1242 Type-E 12" 4-ohm subwoofer at Crutchfield
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Universal Car Stereo Vented Enclosure Single 12" Alpine R2-W12D4 Type – absoluteusa
Alpine SWS-1023D Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield
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Alpine R-Series R2-W10D4 10 Inch Dual 4-Ohm Voice Coils Subwoofer with 750W RMS
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Customer Reviews: Alpine S-W10D4 S-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine Halo R2-Series Dual 10" Voice Coil 4-Ohm Loaded Subwoofer Enclosure Black R2-SB10V - Best Buy
Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
Alpine S-W10D4 S-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Rockville Audio