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Amazon.com: Gikfun 2" 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino (Pack of 2pcs) EK1725 : Electronics
Amazon.com : Visaton FR 7-4 2-1/2" Full-Range Driver 4 Ohm : Electronics
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Amazon.com: Visaton Speaker, FR 10 Hm, 4 Ohms - 4898 : Electronics
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Amazon.com: Lanzar 12in Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Stamped Steel Basket, Dual 4 Ohm Impedance, 1000 Watt Power and Rubber Suspension for Vehicle Audio Stereo Sound System - MAX12D : Electronics
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Amazon.com: Pair of Gravity G3 12 Inch 4000 Watt Package Car Audio Subwoofer w/ 4 Ohm DVC Power (2 Woofers) : Electronics
