Re: 2.75" x 16.5" enough for a port??
the port area will work well. i recommend 45deg. off all of the port corners since you have a few of them. this will help the air flow a lot smoother. i assume your using 3/4" mdf. in that case, cut a 3/4" strip the height of your port and rip it down the center at a 45deg. angle. place these in the corners. shave down the opposite corners to match. the end port board can be rounded on both sides.
2006 Jeep Liberty
Adire Audio, Cadence, Clarion, MB Quart
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)