Ok i built my slotted port box and it all was sounding good untill i started to add more gain. Does anybody know how to reduce port noice. The port is in an L shape becuase it's too long to just be built straight( non bent ). I have not had this problem with any of my other slot ported boxes but this one wants to be an arse. I mean once i hit 30 hz you can just barely hear the bass over the sound of rushing air... well u can hear the rushing air and i don't like that.