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doh! its alive, its alive!!! ITS ALIVE!!!!! (evil genius scientist voice)
not really. your amp doesn't have a warm up cycle... which means. when you turn the key on or off it thumps cause its immediately on letting any little distortion put through to the subs to be played.
you really don't have anything to worry about, unless... its doing it while playing regularly (not turning the key). then you've got some weird stuff going on!
the thumps won't damage your speakers, usually so you'll just hafta endure getting thumped on a regular basis... if its just insanely loud thumps that might damage so have it looked at if thats the case.
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