box size

What for? That subs not going to perform too well, all around. Very high Qts, and hence a high Qtc will result. Very limited excursion, which means it's not going to get very loud at all. But, the Qts is too high to really make a good ported woofer for the increased output, so you are kinda stuck there aswell.

But....

Vb = Vas/(Qtc/Qts)^2-1

Vb = 2.19/(1.5/1.19)^2-1 = 3.72cuft

And that's for a Qtc of 1.5, which is very high. It'll be very peaky, exhibit poor transient response and have little to no low frequency extension. Beyond that, the peak output is going to be very limited due to it's very low linear displacement.

 
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