Help with noise

[SubNit 10+ year member]

So I noticed a very irregular noise coming from the sub as of about 2 hours ago. It only happens on the lower spectrum of tones (low 30's) and it has to be jammin moderatley loud for it to sound off aswell.

It sounds like a very loud rattling or clapping/slapping of some sort. Anyone have the same problem or could maybe try and diagnose this situation?

Sub is in a ported box tuned to the mid 30's

Thanks

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[slim2fattycake 10+ year member]

bottoming out maybe or tensil slap?

what do you have your ssf set at?

 

[SubNit 10+ year member]

I want to say something like 20hz or so

I don't think it's bottoming out though, as I've heard that and it's not as agressive sounding.

 

[SubNit 10+ year member]

Anyone else have any suggestions or tips?

I don't have any of my tools with me at the moment so all I've been able to do is visually inspect the cone. I did however press down on the cone and all seemed fine, no irregularties in feel or sound. Dustcap looked fine aswell