Use JBL DSC 500 Active Subwoofer with Yamaha RXV-673 | Home Theater Forum
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8 Inch Car PA Woofer - 500 Watt High Powered Car Audio Sound Component Speaker System w/ 1.5" Kapton Voice Coil, 55-6 kHz Frequency, 89.2 dB, 8 Ohm, 40 oz Magnet - PylePro PPA8 , Black
JBL SUB300 Sub-500 Subwoofer with JBL SCS500 4 pc speaker set NO REMOTE | eBay