Im building an angled box to fit behing my seat in my truck and was wondering the best way to port it. Could you even do a rectangle port? Or just get an areo port and be done with it?
if you have the room for a rectangle port you can go with that or a square port, if you're really out of room then a circular port may be the only route.
not quite triangular but, you can get an idea of a square port on an angled enclosure i designed.