General Car Audio Discussion & QuestionsAll general car audio discussion goes here. Need help installing speakers, headunits, amps or electrical? Having problems with equipment? Have questions about a product, post here.
Pull it out of the enclosure and listen some more. If it's coming from the sub (and not something rattling inside the box) check the terminals and spider around the spider landing. If it doesn't seem to be something external it could be a non-centered coil or something loose inside the motor. If it only does it when inside the enclosur eit could be the cone hitting the speaker wire if the wire is bunched up around the sub.
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