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I have recently done a full audio install, amp deck subs and speakers. It sound amazing but theres a really high pitch hiss coming from 2 of the tweeters, i mounted the tweeters in the vents above the deck. I hav checked all the grounds, none of the speaker wires or RCA are run beside power. And the hiss only happens when the engine is running, anyone have any ideas?
 

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Is the amp ground wire short as possible, same AWG as the amp power feed and grounded to a solid ground point?

That's all I got. You may choose to provide manufacturer information for others to help. Maybe you have components that aren't of high quality.

Alternator whine is pretty common with with an amp.
 

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