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Help with Stealth Stereo install - ground loop issue?

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  • Luke Girard
    replied
    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.

    Sent from my ONEPLUS A6013 using Tapatalk

    Leave a comment:


  • Luke Girard
    replied
    Originally posted by E Coded View Post
    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.

    Sent from my ONEPLUS A6013 using Tapatalk

    Leave a comment:


  • E Coded
    replied
    Originally posted by Luke Girard View Post
    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.

    Sent from my ONEPLUS A6013 using Tapatalk
    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?

    Leave a comment:


  • E Coded
    replied
    Originally posted by nrubenstein View Post
    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 youíre playing standard iTunes files.
    Thanks for the suggestion, but Im trying to avoid bluetooth.

    Leave a comment:


  • E Coded
    replied
    Originally posted by AndrewBird View Post
    He did that initially.

    How old is your alternator? Worn components could be causing excess electrical noise.
    Alternator is new and is ground to the engine block. All the other grounds have been replaced using bavrest grounding kit.

    Leave a comment:


  • E Coded
    replied
    Originally posted by pandaboo911 View Post
    Ground the device that charges your phone at the same point as the amp?
    I tried this. Same problem.

    Leave a comment:


  • george graves
    replied
    Originally posted by nrubenstein View Post
    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.
    Hmmmm. Looks like a MiniDSP with the Dayton brand?

    Leave a comment:


  • nrubenstein
    replied
    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.

    Leave a comment:


  • Luke Girard
    replied
    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.

    Sent from my ONEPLUS A6013 using Tapatalk

    Leave a comment:


  • AndrewBird
    replied
    Originally posted by pandaboo911 View Post
    Ground the device that charges your phone at the same point as the amp?
    He did that initially.

    How old is your alternator? Worn components could be causing excess electrical noise.

    Leave a comment:


  • pandaboo911
    replied
    Ground the device that charges your phone at the same point as the amp?

    Leave a comment:


  • E Coded
    replied
    Originally posted by george graves View Post
    Sorry - so this is a RPM based noise? Correct?


    It seems to be. Itís a subtle buzzing sound that increases in pitch as the motor is reved. At some point during all the troubleshooting it was louder and more noticeable.

    Leave a comment:


  • george graves
    replied
    Sorry - so this is a RPM based noise? Correct?

    Leave a comment:


  • E Coded
    replied
    Originally posted by bmwman91 View Post
    As far as RCA's, I just ended up building my own from quality cable and connectors.
    https://www.performanceaudio.com/can...-rca-plug.html
    https://www.performanceaudio.com/can...ble-black.html

    Honestly, I doubt that your issue is the cables though, based on the details you provided. Try running a dedicated ground wire from the signal source stuff up front (it looks like you did that based on your diagram, but it sounds like you were assuming the stock harness grounded there?), directly to the lug that the amp is grounded to, or maybe the battery itself. You can do it quick & dirty with the wire running outside the car to see if it works, and then do a more permanent install if it does. I would not trust anything on the original harness, particularly if it was hacked up at some point.
    Slight update: I tried a few more ground locations, but I am still getting a slight engine noise coming through the speakers. It's most noticeable when the stereo is on and no music is playing while the car is running.
    • Quick and dirty ground to the battery terminal
    • Stock grounding location behind the clutch pedal


    I also tested ground continuity with the stock deck and the clutch pedal ground location and it seems to be continuity.

    One thing I forgot to put in the diagram is the amp has a volume/gain pot that is also bundled with the RCA, remote wire, front speaker wires. I have attached a new diagram to how everything is currently wired.

    I am not really sure what else to try at this point. Any suggestions?

    Leave a comment:


  • george graves
    replied
    People seem to get speaker "-" and ground confused.

    Leave a comment:

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