I own a pair of Snell K-IIIs that I've had for about 5 or 6 years. Recently I took off the speaker grill and noticed the foam that covers the perimeter of the cone has begun to crack and come off so that you can stick your fingers inside the speaker cabinet. When I play music and turn up the bass I can feel air escaping from the sides where the foam has cracked and worn away. My question is: will this affect the sound quality of the speaker? and how can I fix this?