Hi Andrew,I tried win isd I entered the new driver specs,but It doesn't import the data to the new project box.I get an error, floating point zero.I found a pdf with a vented box specs on it but it doesn't look like a 3 cu ft box.If I do a folded shelf port is it as simple as changing the 4"x 19 " port size to a rectangular folded port,that is same internal area.Should I use 3/4 mdf to construct it.I have the pdf if you care to look at it.It lists hv= 2.5 in. wv=9 in. lv = 36.89 vb 4.946 cu ft.It's called a slotted port design.Thanks Terry
