Picked up an IDMax 12 v.3 D2. Looking to build an enclosure for it. I emailed IDMax because I can't find the specs for v3 D2 so going by D4. Need 2.55 cu ft and tuned to 28Hz. I have 15"H x 12.5"D x 34"W for the enclosure. With 0.75" MDF this is 2.7927 gross cu ft less 0.12 for driver displacement. So, 2.6727. I think that is close to enough to end up with 2.55 after port volume. Can anyone help me design the port? The port/s have to be out of the front. So I am dealing with less than the 12.5"... is this doable?