I recently added a "real" powered subwoofer to my Judge Dredd which was pretty much plug and play and it sounds awesome!! The Sub as a "high level" input so i simple ran a wire into the cabinet and plugged it into the spare tabs on the bass speaker. No brainer. Im not sure if anyone else as tried this but, wow, what a difference! The game as a great sound to begin with and now its just fantastic. I would highly recommend this mod for any newer machine with a modern sound.