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Ok, i calculate my box to be 1.3876139 ft^3, - .07 for the sub = 1.31 ft^3.
JL recommends 1.00-1.50 ft^3. So I an almost right in the middle and I do not need to trick my sub into thinking that there is more space than there is. So do I need to add any polyfill?
Basically, the closer you get to 1.5 cu ft the deeper the subs will play, at the expense of some spl. If you have more than enough power, I would add some polyfill to deepen the sound. Likewise, the closer you get to 1 cu ft the louder it will get, at the expense of low bass extension.
I would add polyfill, because you can always turn the amp up a little more to compensate--and you get a smoother overall sound. :cheers: