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Monacor SPX-200WP 8 inch 20.32 cm Wideband speaker 100 W 8 Ω | Conrad.com
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Wavecor SW215WA01 20 cm bass paper 4 ohm
Audison AP8 at Onlinecarstereo.com
Amazon.com: 5 Core 2 Pack 8 inch Car Subwoofer Woofer Audio Speaker 500 Watt PMPO, Voice Coil, 4 Ohm, 50 Watt RMS,90mm DBL Magnet and Foam Surround for Vehicle Stereo Sound System
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Amazon.com: 2X Harmony Audio HA-C104 Car Competition 10" Sub 2000W Dual 4 Ohm Subwoofer New : Electronics