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Memphis Audio MB1224 12" MB 500W Subwoofer 2 Or 4 Ohm Direct Vent Voice Coil | MEM21-MB1224
Alpine W10S4, Bass Series Single 4 Ohm Voice Coil 10" Subwoofer - 750W – AVLeaderz
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Dayton Audio Epique E180HE-44 7" DVC MMAG Extended Range Subwoofer 4 Ohm per Coil - Yahoo Shopping