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larryagross, Sounds like you blew the speaker! The amp is sensing the voice coil is connecting to the speakers magnet or iron core and is going into a safe mode. It is possible to blow the coil even when the sub has a built in amp.
First make sure that you have the gains properly set ans not all set to their maximums. Second, disconnect signal to the sub then unplug the power for a few minutes. Third, plug the sub into a source of power on a different circuit using a surge protector.
Does the speaker make any popping at the time it powers up? If so you have a amp problem. If there is no sound produced, connect it back the the system using a different signal cable. Does the speaker now pop again when sound is produced. If so the speaker has failed. Contact a Velodyne repair facility.
Woofers are subjected to relatively high degrees of acceleration which can cause a poorly built voice coil or spider (an additional support located at the junction of voice coil and cone) to break away from the cone or the surround at the edges of the cone may have dissolved.
Cigarette smoke is death to the common foam-type suround and once it is no longer intact, the cone can slap on the frame edges.
Only the very expensive band/concert-type speakers are worth repairing.
Check on eBay for the right size replacement; they atart below $20 US.
High quality speakers actually come with a warranty but then, the Chinese company that built them may not outlast the warranty.