I have two Diamond Audio M6 10D4 10" subs in a sealed enclosure, and I'm having a problem with one of the subs. No matter what volume level, the right sub makes a sound as if the cone is hitting something (more like a vibration). When a bass drum hits, the noise becomes more apparent. It's very annoying. I removed the sub from the enclosure and inspected it, but there doesn't appear to be any visible damage. One other thing I noticed is, if I lightly press on the cone of the sub with my palm while music is playing, the noise will disappear. This noise is so annoying that I had to change the sub from facing the front of the car to facing the rear. The other sub is fine.What could be the problem?
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