Amazon.com: Pyle 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2
JBL CS1214 1000-watt, 12" Car Audio Subwoofer, Black - Walmart.com
RI Audio 10" Subwoofer Dual 4 Ohm Energy Series 800 Watts RMS Single C – Robidoux Inc