Tonight at practice I had a horrible rattling noise in one of my db112s. I briefly looked inside the ports to see if I could see any see anything off, but couldn't get a good look. I went to check the speaker from the front which brings me to my first question: what's the best way to get the grill off without damaging the piping? And #2: If it turns out to be the speaker, what's the best replacement out there?