That huge 60" subwoofer is NOT an MTX. It was built by Richard Clark, the man in the picture. MTX paid him to put their name on it. They had nothing to very little to do with its design (other than helping pay for it by putting their name on it). It (the sub) is in a bread truck with about 10,000 to 20,000 watts rms on it. It did manage to hit about 160 db (could be 150 ish, I cannot remember for sure), at around 20 hz.