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Thread: PLEASE HELP: noise (hiss, buzz) problem

  1. #1
    Newbie
    Join Date
    Oct 2003
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    2

    PLEASE HELP: noise (hiss, buzz) problem

    Hi,

    I've recently finished installing a computer stereo system in the 2000 GS400 but couldn't get rid of the hissing/buzzing noise from the front & rear speakers. For almost a month, I've searched/read from many forums and tried all the tips/suggestions but still couldn't solve the problem. Here's my system setup:

    Battery: Optima Yellow 34/78
    Power Supply: Opus 150W DC PSU (a flip-switch and a relay were used between the ACC and PSU)
    Computer: EPIA M 1000 (installed in glove compartment)
    Monitor: DSCustoms TouchScreen (powered by Opus)
    Soundcard: SB Extigy USB (powered by Opus)
    Amplifiers: Kicker 600.4 and Kicker 1200.1 (installed in trunk)
    Speakers: front: Focal 130V components, rear: CDT 61 components
    Subwoofers: two Infinity Kappa Perfect 12.1 DVC in a bandpass enclosure
    Wirings: Stinger power and speaker cables, Monster Cable 20-ft "mini 1/8" to RCA" cables

    From reading from various posts and tutorials, I thought the noise is caused by a ground loop. But the noise was still there even when I connected the power & ground of the Kicker 600.4 amp directly to the pos. & neg. battery posts, all the settings were set to minimum and the signal input was muted by this method (http://akamaipix.crutchfield.com/gra...p-diagnose.gif).

    Can I assume there should be NO noise if the amp is grounded directly to the battery instead of car metal chassis? Will installing a capacitor help? Is running a long GROUND cable from battery to trunk recommended?

    I would really appreciate your replies with any hints, tips, suggestions, etc. Please help ending my nightmare !!! Sorry for the long post.

  2. #2
    Maximum Bitrate
    Join Date
    Jun 2003
    Location
    Atlanta/Augusta, GA
    Posts
    505
    try a different amp with the same muting and power setup to narrow down the cause of the problem.

    It looks like the prob could be a defect in your amp.

  3. #3
    Maximum Bitrate Naamanf's Avatar
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    Sep 2003
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    Colorado
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    508
    Couple quick suggestions.

    You want the ground cable to be as short as possible. If you don't think the stock ground from the battery is any good, ad another of your own. Make it as short as possible from the negitive battery terminal to a good solid grounding point in the engine compartment.

    Have you tried any other signal sources? Is the noise with the engine on? Off? Both? Knowing that would be a good start. Its possible that your noise is coming from the computer or the long RCA cables to the trunk. Is the noise there with the RCAs removed from the amp? If we can figure where and under what situations the noise is there we should be able to get rid of it.
    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

  4. #4
    Newbie
    Join Date
    Oct 2003
    Posts
    2
    tejesh83, the amp I was testing is an old JBL. I'll try again with the Kicker and probably also use the stock battery laying around.

    Naamanf, I DID add an extra 0-gauge ground cable to the battery and I sanded and cleaned all of the ground points. The noise can be heard with both the engine on and off. I haven't tried other signal sources because even w/o any input signals I still can hear the noise.

    Thank you both for your quick replies.

  5. #5
    Maximum Bitrate Naamanf's Avatar
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    Sep 2003
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    Colorado
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    508
    [QUOTE=knn444]tejesh83, the amp I was testing is an old JBL. QUOTE]

    With another amp it still makes the same noise? You don't be any chance have a Bose system in there do you?
    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

  6. #6
    Variable Bitrate Sh0cker's Avatar
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    Aug 2003
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    LI, NY
    Posts
    406
    Simplest thing to figure out a source of problem would be putting HU and trying out. Excluding amp, computer etc. just basic system.
    Danny.

    "If today was perfect, there would be no need for tomorrow."
    My Car Project® ‹== !10.4" Allbrite, touchscreen, epia, 150opus, gps, wireless, sony remote [old] 128x64 Crystalfontz +double din [new]

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