Amazon.com: Gravity Car Vehicle Subwoofer Audio Speaker - 15 Inch Competition Grade Pressed Paper Cone, 2 Ohm DVC, Advanced Air Flow, 3500W Power for Stereo Sound System Warzone GW15D2 (1 Subwoofer) : Electronics
PYLE PLW15RD 15" 1000W Car Audio Subwoofer Power Sub Woofer Red Single 4 Ohm - Walmart.com