tryin to figure out the volume after port and sub displacement and tryin to figure out what its tuned to. the box is 12" deep..40" long..16" high/tall.... the port is 4" wide..14.5" tall / high ..it goes back 11" deep then turns right and goes 17" long after the 11" deep so i guess the port is 11 wide plus the 17" long after the bend to equal 28" not sure though can some1 help me figure out the volume and the tunning, thanx in advance