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Squealing noise from speakers when 12v port is in use.

Discussion in 'Gen 2 Prius Audio and Electronics' started by Garethh, Aug 10, 2015.

  1. Garethh

    Garethh Junior Member

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    Hi everybody!

    I bought this today. It has to be plugged into the 12v port in order to work; it has no battery in it. BUT when I plug it into the 12v ports (i tried both), this annoying squealing noise comes from the speakers. How can I get rid of this noise completely?

    Any help is much appreciated. Thank you!
     
    #1 Garethh, Aug 10, 2015
  2. ChapmanF

    ChapmanF Senior Member

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    Any gadget that connects both to car power and to audio aux in is likely to couple switching-power-supply noise into the audio. A ground loop isolator (something like this) often helps a lot.

    -Chap
     
    #2 ChapmanF, Aug 11, 2015
  3. SunDevilDrake

    SunDevilDrake Junior Member

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    I used a ferrite choke on my aux cable. It's cheap at $2 and installs in two minutes. Placed it with double sided tape on the inside of my center console so it doesn't rattle around or get in the way. Circuit city use to carry these. Can be bought at local electronic store, but not best buy

    [​IMG]
     
    #3 SunDevilDrake, Aug 11, 2015
  4. Garethh

    Garethh Junior Member

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    Five
    Thank you both for your inputs. I have a question. Both of those are plugged into the audio cable. The noise in my car only comes when power is plugged in. So shouldn't i do something about the power port instead of the audio input or cable? I am really just asking. I have no experience in these things.

    Thanks!
     
    #4 Garethh, Aug 11, 2015
  5. 69shovlhed

    69shovlhed Surly tree hugger

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    the ground loop isolator will remove the noise going into the aux port. it works.
     
    #5 69shovlhed, Aug 11, 2015
  6. Garethh

    Garethh Junior Member

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    I will try it. Thank you all!
     
    #6 Garethh, Aug 11, 2015
  7. SunDevilDrake

    SunDevilDrake Junior Member

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    It's the aux picking ground loops from the phone charger. Would be logical to attack what could be the source of those ground loops but it's found to be most effective to reduce the "squealing" is the two methods above applied to the aux.

    I chose the ferrite choke because I heard some people complain about reduce noise quality when using the ground loop isolator. Plus the choke was cheaper and took up less room in the glove box.
     
    #7 SunDevilDrake, Aug 11, 2015
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