Slightly long read but worth it Last Night during Rehearsal my Avatar B210 Neo Cab started making the Dreaded "Fart" sound out of the left Speaker. I wasn't pushing it very hard at all and I had my 1X15 hooked up as well. I was running my BX500 at about 3 and yes My Eq was way too Bassy. Today My Son and I went to pull the speaker out and test it by itself. My son says "Dad, what's with that piece of paper in the left side port?" We fished it out and Sure as S%$t it was a set list from about 5 years ago that had "slipped" into the Port. It positioned itself perfectly in the port to sound just like a Blown Speaker. Hooked it all back up and she's perfect once again. During the whole time, I was emailing back and forth with Dave at Avatar and he was helping me diagnose it. He offered a nice discount on a replacement even though it's like 6 years old. Mind you it's Sunday and Dave was right there for me to try and help. I love my Avatar Cabinets and the Customer service is the very Best I've ever experienced.