I noticed last week when I first got my wall playing that I had some annoying port noise on the lows. The port is a middle port 4.5" wide 24" tall and 17.5" deep. 2 Fi BTL 15's tuned to 33hz. I'm not sure how to fix this or reduce the noise. Where the baffle meets the port there is a slight lip in spots I need to make it all smooth but I cant figure out how to shave the baffle flush with the port opening without damaging the port walls?