building an enclosure for a subwoofer (1 Viewer)

[boss hawg]

they are tuned around 28 hertz. the ports are 1 5/8'' i.d. and around 2 1/2'' long. weird that inside the box the ports are square cut with a beveled edge on the i.d. then they are flared on the outside so its. hard to measure exactly. but that's pretty close. i think i'll tune them to 20 hertz when i build my new box.
thanks