in my first post, i said the port needs to be ~35" to achieve ~32 hz frequency. keep that in mind, cuz i think you're thinking it does not have to be as long as it needs to be. for the box to see a 35" long port, assuming the front is a single 3/4" baffle, one piece needs to be 21.5" long, and the second piece needs to be 6.75" long.