I remember I had some rattling once on my old 500, I could press on the back amp plate near the bottom and it would stop, I think air was leaking around the seal. Checking the fasteners as the others have mentioned might be a good start. Also, I had one wire that was hanging to low and rattling on the bass port, had to adjust for that...or, make sure you are not running it to hot (to much gain)


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