Help with Stealth Stereo install - ground loop issue?

[E Coded]

So, do you have noise with the amplifier inputs disconnected?

FWIW, my preferred head unit bypass approach these days is Bluetooth into a Dayton DSP-408. Avoiding a bunch of extra DA/AD conversions and head unit variability seems to produce better results. Also, since bluetooth generally streams in AAC, you (probably) even avoid transcoding/downsampling this way when you’re playing standard iTunes files.

Thanks for the suggestion, but Im trying to avoid bluetooth.

[E Coded]

A capacitor before the amplifier will help eliminate unwanted alternator noise. It doesn't have to be a large one. A 0.5 or 1.0 farad capacitor would work just fine.

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I dont have any experience with capacitors in car auto. I was always under the impression that their intended use for high voltage draw. My alternator is 150amp and this is a pretty basic amp -- do you think this would help?

[Luke Girard]

I dont have any experience with capacitors in car auto. I was always under the impression that their intended use for high voltage draw. My alternator is 150amp and this is a pretty basic amp -- do you think this would help?

I've used them in larger audio systems to help with dimming lights when a subwoofer is installed but it also eliminated my alternator whine. Capacitors store energy and are used to filter or buffer any sudden changes in a circuit's voltage, smoothing the ensuing signal. You can get a cheep one on ebay for less then $30. Most people install them in line on the power cable to your amp but I've heard people put it in line from the alternator to the battery. There's a ton of info on how to build your own capacitor to fix alternator noise or even a ground loop isolator.

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[Luke Girard]

Also try running your rca cables seperatly from your remote turn on cable. I ran mine down the center of the car under the center console and carpet to keep them separate from all the amp wiring.

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[Victell]

I am having issues with engine noise coming through the speakers, so it likely a ground loop problem.

Did you ever get this problem sorted? If so, what fixed it?

[E Coded]

Did you ever get this problem sorted? If so, what fixed it?

Unfortunately no. I tried pretty much everything mentioned here and by others. I replaced all the wiring multiple times, ran cables in different configurations, tried different ground locations, tested another amp, and the finally I bought a cheap single din blaupunkt deck. No matter what there was still engine noise coming through the speakers. The factory remote/antenna wire is being used here so maybe there is a problem with how that circuit is grounded?