Replace all subs or just one-- 4-RE8's

[RFmustang 10+ year member]

I currently have four RE8's in a big sealed box on a rockford type rf x6. I don't have the subs turned up that high because when i get to a certain port you hear a violent clapping. i think it's only one of the subs thats doing it. I bought them a couple years ago used off here. I'm not sure if it's a bad sub or they are maxxing???

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[Atimm693 10+ year member]

Probably bottoming out, maybe you could make your box smaller? Maybe one of the subs has a loose dustcap or something.