KEF Kube 8b Powered Subwoofer8 inch active subwoofer Don't let its compact size fool you, the Kube 8b may not take up much space but the bass it delivers is anything but small. With an 8 inch driver the Kube8b is perfect for smaller living rooms. It shares the 300 Watts Class D amp as the larger Kubes, as well as iBX technology to extend the bass depth dynamically. Hear new dimensions in sound with Kube subwoofers The Kube 8b effortlessly unleashes explosive power. iBX technology