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Message: <blockquote data-quote="derek1030" data-source="post: 62273" data-attributes="member: 544631">Just bought a kappa perfect 12.1 about a month ago. I was happy with it at first then yesterday it started making a clanging noise whenever the sub excurses. It does this all the time now at half volume it never did it before?? I am runing the sub with a jbl 600.1 amp in a 1 cubic foot sealed box. i tried turning the gain down on the amp but it still makes the noise and i never had the gain up more than half to start with.Thands guys.</blockquote>

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