from my experience i find with a larger box u get a deeper sounding bass but i never tried making a box too much larger than manufacturer recommendations
well 2day i tried out that same calculator site & build a box - could tell u tomorrow when i put the subs in it .....
yeah, ive found that a bigger box is deeper, ill be able to tell you in about 3 days for sure, im getting the exact same setup as a friend of mine and putting it in a bigger box tuned to the same hz so well see the differance