Alpine S-A60M S-Series mono subwoofer amplifier — 600 watts RMS x 1 at 2 ohms at Crutchfield
Amazon.com: BOSS Audio Systems CXX8 8 Inch Car Subwoofer - 600 Watts Maximum Power, Single 4 Ohm Voice Coil, Easy Mounting, Sold Individually : Everything Else
12'' Marine Subwoofer, 600 Watt PLMRW12 – Pyle USA