Bad Recone

Can a bad recone cause a sub to almost snaking a slapping sound. I got a sundown zv3 18 and at around 1/4th gain it smacks or slaps. Motors good. I need help! I should get it a new kit but I scared of f'in it up. I'm confused. I've tried it on two different setups. Got a different headunit and wiring. Box isn't leaking. Everything's fine. I think it's sub only at this point....?

 
If the coil is not correctly shimmed when adhering the spider and surround the coil can hit the pole making a slapping noise. Dustcap could be loose, spider may have a spot missing glue. Lot of variables

 
If the coil is not correctly shimmed when adhering the spider and surround the coil can hit the pole making a slapping noise. Dustcap could be loose, spider may have a spot missing glue. Lot of variables

So all in all - I need a recone?

 
I have a Zv3 18, another that i got from a trade on facebook today. AND a Zv4 that i got for 100 bucks that has the same problem. No one seems to be answering me. So i reposted it.

Did i sin?

 
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CrownVicTM

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