I've posted this under Subwoofer/Enclosures section over on SMD but I figured I'd post it here as well since this is another DC sub forum. Any thoughts on what this could be?

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sounds like a slightly loose dustcap.

have you only just got it? i had one with a similar issue recently?

when i bought my pair, i got a similar noise from one.. it sounded like something was rubbing inside the sub..

i had broke in my subs using 20 - 25Hz tones played in free air.. when i 1st started to break them in, the noise was very audible.. but about an hour of breakin time later, the majority of noise went away.. now i hardly hear anything at all..

are your subs new? or is it something that just developed?

Subs are about 11 months old although I've only had them playing for about 7 of those months. So the subs are seasoned sort of speak. I've notice this sound since I've had them but I always thought that it was the Autotek amp that I had on them. When I changed that out for the pair of kicker I have on them now and it was still doing the same thing that lead me to believe that the sub itself might be messed up.

press lightly against the cone and see if anything is rubbing.. check the both subs..

Could be an airleak in your box somewhere.