helo guys i really need help with a box for 2 jbl power 12s for a 1995 mustang i am running them with an earthquake powerhouse 2000d amp righ now i am using a seald box 12x32.5x15.5 it sounds clean but low output and i really want to be as loud as possible please guys help

 

Do you have the specs of the sub?
IE:
Qts, Vas, Qes, Fs,
What is the exact model number of the subs?

 

qts0.55/vas1.53f3/43.30/qes0.58/fs28.60