Alpine SWA-12S4 BassLine Series 12" 4-ohm subwoofer at Crutchfield
Alpine 8" Quad-Voice-Coil 4-Ohm Loaded Subwoofer Enclosure with Integrated 120W Class D Amplifier Black PSS-23WRA - Best Buy
Alpine
Customer Reviews: Alpine S-W12D4 S-Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
ALPINE SWT-12S4 Bass Test 20Hz (4k60fps) - YouTube
ALPINE SWT-12S4 1000w 12" Car Audio Subwoofer in Bass Tube Enclosure+7-Band EQ - Rockville Audio
Amazon.com: Alpine SWT-S10 1200W Max (250W RMS) Single 10" Sealed Subwoofer. : Electronics
Alpine KTA-200M SWT-12S4 Alpine KTA-200M Mono Power Pack Amp with Alpine SWT-12S4 12" Loaded Tube Subwoofer and Absolute TW500 Dome Tweeter and Electrical Tape and Mobile Bracket | Reverb
Subwoofer Alpine - YouTube
Alpine SWT-S10-R7EQ Swt-S10 1200W 10" Car Subwoofer In Bass Tube Enclosure+7-Band Equalizer
Amazon.com: Alpine SWT-12S4 1000 Watt 12" Car Audio Bass Tube Subwoofer Bundle with Amplifier and Amp Kit : Electronics
Alpine KTA-200M Mono Power Pack Amp with SWT-12S4 12" Loaded Tube Subw – absoluteusa