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Discussion Starter · #1 ·
I had some extra 14ga speaker wires running from the trunk to the HU (used to use speaker-level), I grounded both ends creating a more closely matched ground between the amps and the HU. Now there's absolutely no engine noise, and almost NO humming when turned all the way up with nothing playing. I'm surprised it's not done on a regular basis in high-end car stereo, only as a last ditch resort.
 

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I was just reading a "how to install an amp" thing online, and that's what they said to do too. I'll try and find the link.

edit: found it: Here

For those that know more about installing amps than me, is this good instructions? I decided I am probably going to install my own stuff, so I am trying to learn all about it.
 
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