a smaller and more affordable version of the famous f113. The most impressively built subwoofer in the price range by far with double-stacked extreme duty magnets. Quality you can feel. Right out of the box, you know it is something special. A truly exciting subwoofer. No other subwoofer brand can deliver this level of excitement, not just the amount of bass, but the quality and the tremendous spatial cues that it can deliver. It is like driving a Ferrari. You know that when you push the button and ask for it, it will give it to you.