Going bigger on box size creates box gain at the tuning frequency and a concurrent increase in excursion as well. Gives you a "one note wonder" at the tuning frequency and if coupled to cabin gain is the normal practice for SPL burps for maximum SPL at one frequency at the expense of all others.I did some quick calculations and at 5.52 cf net tuned to 32 hz I could go up to 72 square inches of port that would be 50 percent more port area. Will that meet our goals? My usable dimensions are 29.5 wide internal 14.5 high internal 28.5 deep internal.
With all that being said - what you want is to shoot for about 2.5 cuft airspace and use the rest of space for a folded or labyrinth port tuned in the 28-32Hz range. You don't need more than 50-60 in² port area even at 2kW per driver.
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