KEF T2 Subwoofer - Black The sleek T2 uses a 10 inch bass driver enclosed in a slimline, closed box design, making the subwoofer both easy to conceal and surprisingly powerful. The T2 Subwoofer operates in the same phase as the rest of the T305 and T205 Home Theater Systems, meaning you'll get a fast and completely undistorted bass presence every time you power it on. Given the T2's size, the subwoofer is easy to conceal.