bro when i type in the dimensions of mtx specs in bass box pro im getting = a net vol of 3.944 cubic ft, box vol = 3.456 cubic ft, port tuned to 30.55hz. mtx recommend a 2'' port 15'' are 3'' port for d least, not so? with that specs im gettin 121db at 50hz peak.
i jus did a quick mod 2 the enclosure Net vol of 5.832, Box Vol of 5, Vent= H 16 x W 3 x D 17 (port it tuned to 35.5hz) and im getting 124db at 50hz peak.
i not to sure if u could get more out of it i dont hav time at this moment, but u can see thats an increase of 3db
its all up 2 u. but they say in a smaller enclosure u can put more power 2 the sub
personally i tink mtx specs is good i jus dont like d idea of a 2'' port
if i were u i wud use mtx specs, recalculate a 3'' port at 30.55hz an use it instead of d 2'' port
hope this help..oh yea i calculated for a T9515-44 at 2ohm