JBL P1024 Power Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
5 Core 10 Inch Subwoofer 85W RMS Full Range Pro Audio Speaker 4 Ohm Car Subwoofers 1 CCAW Voice Coil Sub Woofer w 23 oz Magnet for Car RV DJs Home Theater - FR-10-120 WP - Newegg.com
JBL 10" Inch 900w Car Audio Subwoofer Driver Bass STAGE SPL Sub Woofer New | eBay
Best Buy: JBL 10" 250-Watt Powered Subwoofer SUB 10