Amazon.com: 4) Rockville RM104PRO 10" 2400 Watt 4-Ohm SPL Car Midrange Mid-Bass Pro Speakers : Electronics
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Amazon.com: Gikfun 2" 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino (Pack of 2pcs) EK1725 : Electronics
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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 -
Loudspeaker Impedance 4-Ohm vs 8-Ohm: Which is Better? - YouTube
6" Car Audio Speaker Subwoofer - 300 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System w/ Molded P.P. Cone, 86 dB, 4Ohm, 40 oz Magnet,1 inch KAPTON Voice Coil - Pyramid PW677X : Electronics - Amazon.com
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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
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Amazon.com: Timpano TPT-M6-4 6.5 Inch Midrange Loudspeaker, 4 Ohm, 200 Watts Max Power, 70 Watts RMS, OEM Replacement Car Speaker, Easy to Install Without Amplification (Pair) : Electronics
Amazon.com: DS18 SLC-MD10 Car Subwoofer Audio Speaker - 10" in. Polypropylene Cone, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance, 800W MAX Power and 200W RMS Power, for Vehicle Stereo Sound (