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Alternator whine, only on rear speakers

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49
Hi everyone!

When I bought my EP3, it only had front speakers, so I went ahead and bought a pair for the back as well, but after I installed them I noticed significant alternator whine.
The problem is definitely not with the amp or the head unit, since the whining doesn't go away when I disconnect the speakers. When I installed the new pair, I just screwed it in metal-to-metal, could that be the problem?
 
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