BOSS Audio Systems BE8D Elite Series 8 Inch Car Audio Subwoofer - 600 Watts Max, Dual 4 Ohm Voice Coil, For Truck Boxes and Enclosures, Hook Up To Amplifier
Amazon.com: Sundown Audio SA-15 D2 15" 600W Dual 2-Ohm SA Series Subwoofer : Electronics
STLF-15AS | 15" 600W Cast Aluminum Frame Woofer (Low Frequency Driver) – Sound Town