Hello all,\n \n I've had my ETY's (4S) since August and am beginning to think I'm hearing a degradation in sound quality. It may just all be in my head but I'm wondering if it's the filters.\n \n Can you visually tell that the filters need to be changed? \n \n They don't look clogged. They still seem green and I can still see the grid pattern on them. Any thoughts?\n \n Thanks.