a friend of mine just put 2 xtant m412's in serperat sealed boxes. they are just under 1 cubic foot each. hes pushing them with a punch 360. it sounds decent the way it is but i want to build him a ported box hoping it will be louder.
the spec sheet for the speaker recomends a 2.50cf box with a 4"x8.75" port and it says that would be tuned to 37hz.
for 2 subs, i would make the box 5 cubic feet but what do i do with the port dimension? does the length double? does the diameter double?
i probably was going to use a rectangular port, which would be 1.5"x8.38" if that matters.
there are also specs for a bigger box (3cu each) with a lower tuning frequency (35hz). would i be better off using the biggest box they say?