Marvel, no problem! Here's a link to the thread on the Oris forum: http://www.bd-design.info/forum/reply.php?id=6640,6640
Homemade, the EQ is done by a hipass filter with Q=2 at 31Hz. This is the same as 6dB EQ at 31Hz. I have a spreadsheet simulating this but unfortunately I don't no how to post a graph from it. With no room effects the ported/EQ'ed box is almost flat from 30Hz, and the sealed stock box is almost 14dB down compared to this. Above ~100Hz there isn't much effect from the porting/EQ'ing, but here the horn loading starts. So the combination of the horn and the port/EQ makes the response quite flate.
Frode