The sock is just the fabric covering the panel. You must be discribing the panel when you are mentioning the sock. What you discribed may or may not be the problem. These are relatively new speakers. Send them back to Magnapan for repair.
Magnepan 3.5R buzzing
I have a 2 year old pair of Maggie 3.5R's and recently when playing some music which contains low bass the one speaker's top mid-bass panel plays the music but there is a buzzing along with the music. Has anyone had this problem, is there a quick fix thatI can perform w/o having to send back to Magnepan?