Quote Originally Posted by biju
...Good point. I've thought about it, but doesn't adding the in-line isolator reduce signal strength (voltage), etc.? I'm asking because I honestly have no idea - and want to make sure I maintain the sound quality, etc.

Thanks.

-biju.
Agreed. Those are a worthy fix, its effectively a tank circuit, which takes the excess "noise" and grounds it. While I havent had experience with this adversely effecting the sound quality, it is more of a band-aid type fix rather than a permanent solution.

Just seems odd to me, that by adding a couple amps, you induced whine. This as I reference earlier is probably because you are slightly undersized in your main cables to the battery (exceed ampacity rating of the conductor).

Like I say, I like to run both ground and return to the battery.
If, for ease of attempting, you want to try to ground near the amps, then that should be acceptable, but you definitely want to disconnect the feed to the battery so as not to introduce a ground loop as I referenced previously. With your 1/0 local (to the amp) ground, then that would reduce the loop distance enough to be within the ampacity rating of the cable.

Whatever you do, ensure that both conductors (ground and return) are the same size on ALL circuits.

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