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Amazon.com: BOSS Audio Systems CXX12 Car Subwoofer - 1000 Watts Maximum Power, 12 Inch , Single 4 Ohm Voice Coil, Sold Individually,Black : Electronics
Amazon.com: Dayton Audio DAEX30HESF-4 High Efficiency Steered Flux Exciter with Shielding 30mm 40W 4 Ohm : Electronics
Amazon.com: Skar Audio IX-12 D4 12" 500 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: GRS 3FR-4 Full Range 3" Speaker Driver 4 Ohm : Electronics
Amazon.com: Skar Audio SDR-12 D4 12" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: Skar Audio FSX10-4 10" 300 Watt 4 Ohm Pro Audio Midrange Loudspeaker, Each : Everything Else
5pcs 4 ohm 4RΩJ 10 watt Axial Ceramic Cement Power Resistor 10W: Amazon.com: Industrial & Scientific
Amazon.com: Alpine X-W10D4 Car Audio Type X Dual 4 Ohm 1800 Watt 10" Subwoofers with Sub Install Kit Package : Electronics
Amazon.com: Rockford Fosgate P3D4-12 Punch P3 DVC 4-Ohm 12-Inch 600-Watt RMS 1200-Watt Peak Subwoofer : Electronics
Amazon.com: Pyle Car Subwoofer Audio Speaker - 8in Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 800 Watt Power and Foam Surround for Vehicle Stereo Sound System -
Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 4-ohm (STLF-1504-4) : Everything Else
Amazon.com: AudioPipe TXX-BDC4-12 Dual 4 Ohm 12 inch 2,200 W Car Speaker Subwoofer, Black (4 Pack) : Electronics
Amazon.com: 1.5” Audio Car Tweeter Speaker - Aluminum Die-Cast Frame, 500 Watt Peak, 2 kHz - 25 kHz Frequency Response, 4 Ohm, Heavy Duty 30 oz. Magnet Structure - Pyle PDBT31 SILVER : Electronics
Amazon.com: Dayton Audio DCS165-4 6-1/2" Classic Subwoofer 4 Ohm : Electronics
Amazon.com: Rockford Fosgate PPS4-6 6.5" 800W 4-Ohm Impedance Mid-Range Car Speakers 4 Pack with Fiber Reinforced Paper Cone and Stamp Cast Aluminum Frame : Electronics
Amazon.com: uxcell 3W 4 Ohm Metal Housing Round Magnet Speaker Loudspeaker 2Pcs : Electronics
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Amazon.com: Fielect 4Pcs 5W 4 Ohm DIY Magnetic Speaker Audio Speakers 77mm Diameter Round Shape Replacement Loudspeaker : Electronics
Amazon.com: Dayton Audio ND105-4 4" Aluminum Cone Midbass Neo Driver 4 Ohm : Electronics
Amazon.com: CT Sounds STRATO-10-D4 2500 Watts Max 10 Inch Car Subwoofer Dual 4 Ohm : Everything Else
Amazon.com: GRS 3FR-4 Full Range 3" Speaker Driver 4 Ohm : Electronics
