ok i got a call today from the guy w/ the loudest system in town... he was talkin sh*t and it pissed me off so now i gotta get louder than him... he has 2 15in mtx 7500's in sealed boxes... i dont know how many watts but im sure its not more than 1500. he told me he hit 154.3. i dont believe him but i got to make sure im louder than him so im makin an spl box for my 15in re sx. any suggestions? im thinkin 4 cubes after displacement, resined, braced, and tuned high. what should i tune it to? im thinkin 40 or 45hz maybe?