Originally Posted by fourthmeal View Post
I really wish I had the Polk Audio whitepaper on their special port design. I lost it long ago and it was supposed to be a free release but now it is gone. Its the one that has the spike in the middle of it, going into the port. Supposed to be for floor-stander subs inside their main towers. There's a pair in the basement, I might have to go get some pics. Anyway, that port makes zero noise and uses the space very nicely.
Interesting... I'd love to see pictures.

However, I wonder about vent compression. It is my understanding that with ordinary vents (particularly flared ones), by the time you're hearing vent noise, vent compression will be significantly limiting output potential/vent efficiency.