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Amazon.com: AudioPipe TXX-BDC4-12 12 Inch 2,200 Watt High Performance Powerful 4 Ohm DVC Vehicle Car Audio Subwoofer Speaker System, Black (2 Pack) : Electronics
Amazon.com: KICKER 44CWCS104 CompC 10" 500W Single 4-Ohm Car Subwoofer Bundle with Rockville RSV10 Single Vented Subwoofer Enclosure Box and Single Sub Box Enclosure Installation Kit : Electronics
Amazon.com: Rockville VS8K54 8" K5 800w Car Subwoofer in Vented Sub Enclosure Box-4 Ohm : Everything Else
Amazon.com: Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver and Box X1 MM Phono Preamplifier : Electronics
Amazon.com: KICKER 43VC124 Comp 12" Subwoofer in Vented Sub Box Enclosure, 4 -Ohm Bundle with Rockville RWK81 8 Gauge Amp Installation Kit and RXA-T1 Car Stereo Amp : Electronics
Amazon.com: Skar Audio SDR-10 D4 10" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: Rockville K5 W15K5S4 15" 2000w 4 Ohm Car Audio Subwoofer Sub 500w RMS CEA Rated! Bundle with Rockville RGS15 Single 15" Sealed Car Sub Enclosure Box & Enclosure Installation Kit (3
Amazon.com: KICKER 43C124 12-Inch 600W 4-Ohm COMP Car Audio Subwoofers (2 Pack) and Q-Power QBOMB12V Dual Vented Subwoofer Box Enclosure with Black Bedliner Spray : Electronics
Amazon.com: ORION Cobalt CO525C 5.25” 4 OHM 2-Way System 50 Watts RM Coaxials Series CO Speakers Car Audio Stereo Set of 2 Speakers : Electronics
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Amazon.com: Kicker 44CWCD104 Dual 4-Ohm Car Subwoofer Sub Bundle with dB11 RMS Car Amp and Remote, Single Box Kit: Wire,Screws,Spades, RSV10 Single Vented Subwoofer Box and RWK81 Amp Wire Kit with RCA (
Amazon.com: Black Diamond Car Audio 15" Bass Subwoofer 4-Ohm Dvc 600 Watts DIA-15D4 : Electronics
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Amazon.com: Harmony Audio HA-F104 Car Stereo Flatline Series 10" Sub 700W Single 4 Ohm Subwoofer : Electronics
Amazon.com: KICKER 2 43C124 12" 600W Car Audio Subwoofers Subs 4 Ohm + Dual Sealed Sub Box : Electronics