I was thinking of using a down firing slotted port for my sub and I wondered if anyone had ever done this. The sub would also be down firing. I was also thinking of putting a 45 degree angle to flare the slot and cut down on turbulence. The port itself would be about 16"x1.5" and the flare would be 3" total. I haven't seen too many slotted port designs in the HT area and was wondering if its just because of a build/bracing issue or if it was something else. This would alow me to have a high flow port cheap and it wouldn't be pointing right at my upstairs living room. I can draw a picture of what I am talking about if I am not making sense.