BOSS Audio Systems 600-Watt 8-Inch Car Subwoofer Audio Speaker, Single (2 Pack) - Walmart.com
Pyle 6 in. 600-Watt Max Dual Voice Coil 4-Ohm Car Stereo Audio Power Subwoofer PLPW6D
Audio Systems Amplified Car Subwoofer - 600 Watts Max Power, Low Profile, 10 Inch Subwoofer, Remote Subwoofer Control, Great for Vehicles That Need Bass But Have Limited Space - Walmart.com