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Ground loop isolator, isolated half my audio?

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  • Ground loop isolator, isolated half my audio?

    So I get a whine, it's not terribly loud, and with my music at a decent level I can't hear it.

    However, if I'm not listening to music, but say navigation directions, or a road trip and someone isn't blasting a DVD, then you hear it.

    So I had the install shop throw on a ground loop isolator. No more whine! Half the sound gone =(

    So we had to remove it. Do you think it was a bad isolator? Are some isolators better? Any other solution, other than trying different locations for the ground?

    It's not terrible, but it's annoying if I'm wanting to use the navigation

  • #2
    some are DEFINITELY better than others.. i bought a scosche one from walmart a couple days ago and it made the sound twice as loud as it was before the isolator was installed so i took that crap back lol Senior Tech Blogger (Want a product reviewed? Contact me.)
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    • #3
      Well if anyone has one that works well, please post so myself (and maybe others) can try it out.



      • #4
        I read somewhere very recently that the one that the Best Buy install shop sells is very good and is the most transparent one they know of.
        My Grandma & Her Friends on Their Spring Vacation


        • #5
          I bought that one from BestBuy and it really didn't help out much on my setup.


          • #6
            I had 2 laying around from RadioShack from when I worked there, and they worked pretty well. When I moved my PC I was more careful with the wiring and didnt need them anymore...
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            • #7
              I, too, purchased the Radio Shack GLI (about$17) and noize went bye-bye.

              I have a discriminating ear and the GLI did not degrade sound quality one bit.

              Best of luck and blessings.
              Happy CarPC'ing!


              • #8
                The RadioShack GLI I bought made my sound HORRIBLE. Low frequencies were muddy/non-existent, vocals were lost in the jumbles of high frequencies... horrible. I thought it was my BlitzSafe adaptor the whole time, even had it replaced under warranty and the same result. I took out the GLI today and it's back to perfect sound quality - looks like I don't even need the GLI anyways, I have no background noise from the car/alternator.


                • #9
                  Has anyone considered the output impedance of the circuit driving the GLI? Consider the high pass RL filter on this page :

                  Personally I use a unity gain opamp "buffer" to reduce the output impedance to drive my GLI, I get no issues.
                  Old Systems retired due to new car
                  New system at design/prototype stage on BeagleBoard.