So, a while ago the dust cap on my JBL GTO804 popped off... don't know how, I never really crank it. Can I just JB Weld or super glue this back on as a temp fix? I know if any debris got in there it might damage the sub.

Until I figure out what I want to replace it with?

 

as a temp, you can just super glue it. otherwise just get some hobby glue and that should hold, make sure you clean off any glue that was on there before.

 

As in hobby clue do you mean like model glue?

 

Yes