i'm thinking of making a ported box 2 cu. @ 31 hz here are the dimensions i'm thinking.
without a port i figured the cu. is 2.348
what i can't figure out is the dimensions i would need a round 4" port to be in order to tune it to 30-32 hz. i'm thinking side port, maybe... and the sub facing rear. i tried it calculating a square port, no dice. can't get it to tune low enough.