Triple-10\
Amazon.com: Audioengine S8 250W Powered Subwoofer, Built-in Amplifier (Black) : Electronics
Dynaudio Sub 6 12\
Yamaha DXS12mkII Powered Subwoofer (Black) DXS12MKII B\u0026H Photo
CANTON SUB 12.3 12\
TSW12 12\
Dayton Audio SUB-1000 10\