Box desing For Pioneer TS-W256DVC Help-Advise?!!

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I have bought a pioneer TS-W256DVC sub. And I have a few questions, in order to make a good desing.
In the manual, there are a diferent examples, ported, sealed, and bandpass, ich one with 3 different sizes, recomended, small, and big.
I think that the recomended sealed, that is the desing I want is to small, 22,6 lt. (.8cu.ft.).
I would like to know wich is the difference between a QTC of 0.577 (Bessel) and 0.707 (Butterworth).
I also would like some advise on bracing and building tips.

Thanks.

Lautaro.
 
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