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Amazon.com: Pioneer TS-A301D4 - Powerful 12-inch Subwoofer, 1600 Watts Peak Power, Dual 4 Ohm Voice Coil for Powerful Bass : Electronics
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Amazon.com: Pioneer TS-A301S4 - Powerful 12-inch Subwoofer, 1600 Watts Peak Power, Single 4 Ohm Voice Coil for a Powerful Bass : Electronics
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