build a different box for an already made sub. i'm sure it all depends on finding t/s paramaters. asking because i have a klipsch rw 12d, i like the sub but get excessive port noise at moderate levels on low freq. bass. been thinking of building different sub(or buying pj) and wonder if its poss to just build a different box, bigger and tuned lower? or should i just sell it and build a new sub?