Subwoofer popping at medium-high volume

[theibros]

I have a 10w7 wired at 3 ohms to a jl 1000/1 amp. It's receiving 750 watts currently in a ported box made to spec for this sub. At medium-high volume the sub just starts making popping noises (still plays well). How can I prevent this?

Thanks,

Alex

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[Hertz Mafia]

Bottoming out? Rocking the coil? Gotta see what's going on. Does it do it on all songs? Or just lower bass songs? Are you playing to far below tuneing? Is the dust cap attached all the way? Is the spider glued down all the way around?