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Pyle Power Series Dual-voice-coil 4-ohm Subwoofer (6.5", 600-Watt) in the Mobile Audio department at Lowes.com
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Top Palace TP-HO6.2 - 6.5inch 2way Component Set for Honda — The Audio Co.
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Pyle 6.5 in. 600-Watt Car Audio Subwoofers Subs Power Woofers 4 Ohm 2 x WX65X - The Home Depot
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Amazon.com: Pyle Car Vehicle Subwoofer Audio Speaker - 6.5 Non-Pressed Paper Cone, Black Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 600 Watt Power, Foam Surround for Vehicle Stereo Sound System -PLPW6D : Electronics