The Kube 12b is the largest of the Kube Subwoofers from KEF. It has been engineered to deliver the deepest bass for both music & movies so it works in both a hi-fi & home cinema setup. If you want to feel the earth move from the power of bass look no further. Kube 12b has a 300-watt Class D amplifier making it ideal for larger rooms. A large 12-inch driver & i BX technology dynamically extend bass depth. This sub makes a great accompaniment to systems with larger floorstanding or bookshelf speaker models for consistent levels of power & dispersion.