Cadence PXW12X4 12" Pro Audio Woofer 400 W RMS 4Ω | eBay
CADENCE S2W15D4.V2 15″ SINGLE 1600 WATTS DUAL 4 OHM CAR AUDIO SUBWOOFER 760488896051 | eBay
Cadence PRO 15X | Sub Woofer Speakers | Croooober
Amazon.com: Cadence 8 Inch Car Subwoofer, High Performance 500 Watts Dual 2 Ohm 2 Inch Black Aluminium 4 Layer Voice Coil, Ultra Drive Series Car Audio Woofer UD8D2, Single : Everything Else