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Thread: audio noise and ground loop isolator

  1. 06-30-2005, 03:10 PM #1
    jdogg1583
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    audio noise and ground loop isolator

    ok well just like many other people i have a noise coming through my speakers when im at high rpms. i went to radio shack and bought a ground loop isolator and installed. it totally gets rid of the noise, but it also completely takes out the bass. any ideas of how to fix either problem?

    also, i have a mustang with the mach 460 stereo. does anyone know where the amps in the trunk are grounded? i looked all over and searched the web and i can't find anything.

    any help would be awsome. thanks.
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  2. 06-30-2005, 06:36 PM #2
    Drdee
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    Trouble with the isolator is its AC coupling your head-unit to the amp. Its possible before you used the isolator you were DC coupled. In any case even if you were not, your lowest cut-off frequency would have let the wanted low-frequencies pass through. Now in effect you have a high-pass filter. I'm surprised though that is removes all the bass. Perhaps try a different better quality isolator. Also it might be worth looking at the frequency responses of these devices before choosing a suitable one. They will have some roll-off at the lower end but should be below the audible hearing range, 30Hz or so.

    Drdee
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  3. 06-30-2005, 07:28 PM #3
    neon_eddy
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    I made a good isolater from 2 mono channel isolators, and it was only about $7 to make and works great .. keep in mind they just lay a inverse of the noise over the original sou nd to remove noise, so if your bass gets cut out, you're getting bass freqency noise I would suspect.. or it's a sucky isolator.. I got my parts from RS too.. don't ever lsiten to the bone heads who work there and sell phones to people all day...
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  4. 06-30-2005, 08:13 PM #4
    pancit175
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    did the ground loop isolator come equipt with a wire that you could ground to the chasis. With the ones that i've worked with, they say if less sound or no sound at all comes through there after using the gli, then you shoud ground those wires and it should work properly. If it doesnt come with that option i would suggest that you pick up one that you can ground.
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  5. 06-30-2005, 10:48 PM #5
    jdogg1583
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    still lost

    this is what i have:
    http://www.radioshack.com/product.as...t%5Fid=270-054

    no, it doesn't allow me to ground it anywhere. i really don't understand anything you are telling me. i don't understand audio at all. and someone explain it more to me? please. thanks.
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  6. 07-01-2005, 12:45 PM #6
    pancit175
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    http://www.installedge.com/products/...roductID=14672
    you can pick this up at bestbuy. GROUND LOOP ISOLATOR W/ "1.3 DB GAIN ON LOW END" so you dont get bass drain.
    "In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
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  7. 07-01-2005, 11:34 PM #7
    Cheekz185
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    Quote Originally Posted by jdogg1583
    ok well just like many other people i have a noise coming through my speakers when im at high rpms. i went to radio shack and bought a ground loop isolator and installed. it totally gets rid of the noise, but it also completely takes out the bass. any ideas of how to fix either problem?

    also, i have a mustang with the mach 460 stereo. does anyone know where the amps in the trunk are grounded? i looked all over and searched the web and i can't find anything.

    any help would be awsome. thanks.
    Hey did you fix the problem? IF you did let me know what it was
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  8. 07-02-2005, 02:16 AM #8
    jdogg1583
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    no im still looking for a solution
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  9. 07-02-2005, 05:35 PM #9
    jdogg1583
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    still isn't working

    i picked up that gli from bestbuy that was recommended and it took the bass out too. anybody have any other suggestions? please let me know. thanks.
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  10. 07-02-2005, 09:04 PM #10
    pancit175
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    did you try grounding the brown wires attached to it?
    "In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
    "Do it right or don't do it at all"

    PROGRESS:
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