I'm not sure, really. Sound quality seems fine, not distorted or anything. But the woofer on one side has developed a vibration that has become apparent even at lower volumes. It's sort of frequency specific and if I lightly touch the dust cap, the vibration goes away and it sounds pretty good.
So if the driver isn't blown and it's just a loose dust cap, any ideas on how to secure it or should I just take it back to the dealer and let him work it out?