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Amazon.com: Orion HCCA121-SPLX HCCA 12 Inch 7500 Watts RMS / 30000 Burp Dual 1 Ohm Voice Coil SPL Competition DB Drag Subwoofer : Electronics
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Amazon.com: Orion Subwoofer Competition RMS Power Dual Voice Coil 4" high Temp Voice Coil - Single Speaker Car Stereo Bass Woofer (HCCA152, 15 Inch - Dual 2 Ohm) : Electronics
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