From: weird sound? HALP!

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I've had my fi Q12 for about 7 months now. I woke up one day, started driving turned up the volume and all of a sudden a horrible rattling noise started playing. It's like a car rattling noise but coming directly from the speaker. I dont think the sub is blown. the cone pushes down just fine but I hate to play it loud cause it sounds so bad for the sub. I just took it out in case i need to send it in to get reconed. do you think ill need to do that? what do you think the problem is? thanks