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Amazon.com: Powerbass 2XL-1240D Compact Dual 4-Ohm 12" Subwoofer : Electronics
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Loudspeaker Impedance 4-Ohm vs 8-Ohm: Which is Better? - YouTube
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Amazon.com: Sound Storm Laboratories SSL EX365 6.5"" 150W 3-Way Car Coaxial Audio Black Speaker Pair with Poly Injection Woofer Cone and 4 Ohm Impedance : 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 -
