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Amazon.com: American Bass XO-1544 15-inch Subwoofer 500 Watt RMS / 1000 Watt Max Dual Voice Coil 4 Ohm Voice Coils 125 Oz Magnet : Musical Instruments
Amazon.com: H YANKA 12 Inch Subwoofer - 12 Inch Paper Cone Subwoofer Car Audio, Black Steel Basket, Dual Voice Coil 2 Ohm Impedance 12 subwoofer, 1800W MAX Power 12 inch Competition Subwoofer : Electronics
Amazon.com: Pyramid 10 Inch Car Subwoofer Speaker - 500 Watt High Powered Car Audio Sound Component Speaker System w/ 2 Inch High-Temperature Kapton Voice Coil, 85.6 dB, 8 Ohm, 60 oz Magnet - Pyramid PW1048USX : Electronics
Amazon.com: PYLE-PRO 15 Inch Car Midbass Woofer -800 Watt High Powered Car Audio Sound Component Speaker System w/High-Temperature Kapton Voice Coil, 30Hz-3kHz Frequency,90.2 dB, 8 Ohm, 70 oz Magnet PPA15 , BLACK :