Alright, I have about a year old Klipsch KSW-12 sub. I am not using it right now, but would like to keep it as a back-up or to possibly integrate it into a bedroom system some day. Anyway, there is a problem with the sub. I don't know how to explain this well, but I'll give it a shot. On the back of the sub is the port. When looking inside the port, there is a tube that is about the same size diameter as the port opening and about 6-7" long ...... rattling around loose inside the enclosure. What the heck is that tube? I assume that it was connected to the port opening from the inside at one time, but honestly, I don't know for sure. I don't think I ever really looked into the port opening before. I guess what I am wondering is where this tube is supposed to start and where it is supposed to end. I could take the woofer or amp off to try figure it out, but I figured some of the speaker-o-files here may be able to guide me a little bit. I am not sure how it got loose to begin with, but I assume it must have rattled loose sometime. Honestly, I never noticed the difference in sound quality when I was using it as my primary, but after testing again, I can definitely hear it rattling in there. I guess I am wondering why this tube is there to begin with. Maybe to decrease port noise? Thanks guys.