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Thread: Complicated Audio Quality Problem

  1. #1
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    Complicated Audio Quality Problem

    Ok Here is the Problem

    I have a ground loop, so I use a ground loop isolator to silence the horrible buzzing.

    I have four stock speakers, two tweeters and two Subs.
    With the ground loop isolator in place the subs sound like crap, the bass is not as deep and if I turn the sound up to compensate they get distorted, if I take the the ground loop isolator out everything sounds great except for the buzzing which is really annoying especially with the tweeters.

    It doesn't sound like that big of an issue but it has been bugging me for like 2 weeks, to the point where I don't even want to use my computer anymore.

  2. #2
    Maximum Bitrate Naamanf's Avatar
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    Quote Originally Posted by StangBoyCIC
    Ok Here is the Problem

    I have a ground loop, so I use a ground loop isolator to silence the horrible buzzing.

    I have four stock speakers, two tweeters and two Subs.
    With the ground loop isolator in place the subs sound like crap, the bass is not as deep and if I turn the sound up to compensate they get distorted, if I take the the ground loop isolator out everything sounds great except for the buzzing which is really annoying especially with the tweeters.

    It doesn't sound like that big of an issue but it has been bugging me for like 2 weeks, to the point where I don't even want to use my computer anymore.
    Check and make sure all your grounds are really good. Make sure your battery is grounded good. If you are sure all your grounds are good you might try an isolator for the DC power side. Best bet is to still make sure everything is grounded properly.
    2007 Tahoe
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  3. #3
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    I had a ground loop as well. I just went to radio shack, bought two audio isolation transformers, (one for left and one for right channel), and made a small audio isolation box. I used RCA jacks on the box, but you can use any type of connector you want. I think the important thing with audio transformers is to get the impedeance right. These seem to be ok. Hope this helps.

  4. #4
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    Everything is grounded properly, and two audio isolation transformers would have the same problem I have with the ground loop isolator, the subs would sound like crap. Thanks for you help but those are not the answers I am looking for.

  5. #5
    Maximum Bitrate Naamanf's Avatar
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    Quote Originally Posted by StangBoyCIC
    Everything is grounded properly, and two audio isolation transformers would have the same problem I have with the ground loop isolator, the subs would sound like crap. Thanks for you help but those are not the answers I am looking for.
    Is the sound there when the amps are not connected? Have you tried diffrent RCAs? Are they running by the dc power lines for the amp/computer? Have you tried a diffrent audio source other that the computer?
    2007 Tahoe
    Opus with iBase 896 and Pentium M 735 Transflective Xenarc Alpine DVA-9861, PXA-H900, Sinfoni 45X2 (2) 90x2, Genesis Dual Mono, JL 1000/1 (2), Focal Be tweeters, ScanSpeak Revelator Mids, Dynaudio MW170, Dayton 12" Ref.

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  6. #6
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    Yes, i've tried most all of that, I also wired the inverter to a separate battery, this fixed the buzzing but I can't leave it like that permanently.

    What I'm looking for at this point is a way to filter the buzzing from going into the tweets and factory speakers but let it pass to the subs, I think in taking the buzzing out the isolator is also taking out a part of the low frequencies the subs need to sound good. I have two RCA's coming out of the computer into the aux of my head unit, so how would I go about doing this

  7. #7
    Maximum Bitrate Naamanf's Avatar
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    Quote Originally Posted by StangBoyCIC
    Yes, i've tried most all of that, I also wired the inverter to a separate battery, this fixed the buzzing but I can't leave it like that permanently.

    What I'm looking for at this point is a way to filter the buzzing from going into the tweets and factory speakers but let it pass to the subs, I think in taking the buzzing out the isolator is also taking out a part of the low frequencies the subs need to sound good. I have two RCA's coming out of the computer into the aux of my head unit, so how would I go about doing this
    I suggest that your try to get rid of the noise problem before it enters your audio path. So the computer is powered by and inverter and the noise is not there when it is hooked up to a seperate battery? Then may be you might want to fillter the DC power that is going into the inverter. The more you leave your audio signal alone the better things will sound.
    2007 Tahoe
    Opus with iBase 896 and Pentium M 735 Transflective Xenarc Alpine DVA-9861, PXA-H900, Sinfoni 45X2 (2) 90x2, Genesis Dual Mono, JL 1000/1 (2), Focal Be tweeters, ScanSpeak Revelator Mids, Dynaudio MW170, Dayton 12" Ref.

    My Install

  8. #8
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    Thats sounds like its worth trying, how would I go about doing that though?

  9. #9
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    If you get no noise from an outside battery we know its not a hardware problem. I had to resolder the RCA's to the PCB on my old Kenwood last week to get rid of some buzzing.

    You may want to look at how your battery is grounded to your car chassis/engine. Adding another ground wire from your car battery will sometimes help.

    Is there noise when the car is off too? Or just alternator whine?

    Search rec.audio.car in Google groups and there are thousands of good posts about ground loops. I'll see if I can dig up a website with a well written checklist too.

  10. #10
    Variable Bitrate inniss777's Avatar
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    Hay StangBoyCIC, what type of case is your car pc (plasic or meatal)? If it is metal you have to ground the case with at the same size wire or bigger than the wire for the inverter. also the ground wire from the computer case needs to be as short as possible to the chassie of the car. make shur as well the connection point to the car's chassie has no paint or rust.
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