Yamaha HS8S 8" powered studio subwoofer at Crutchfield
SubDude-II™ Subwoofer Isolation Pad | Auralex Acoustics
Amazon.com: Mackie CR-X Series, 8-Inch Multimedia 200w Subwoofer with Professional Studio-Quality Sound, Bluetooth and Desktop Volume Control (CR8S-XBT) : Musical Instruments
Yamaha HS8S Active Studio Subwoofer | zZounds
Yamaha HS8S 8 inch Powered Studio Subwoofer | Sweetwater