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JL Audio System Noise --- Help!!!

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  • JL Audio System Noise --- Help!!!

    So I have a JL 12w7, 1000/1 amp, 300/4 amp, mids, lows, tweets, JL and stinger RCAs, and a HC600 2nd battery, with a pioneer 5900 HU.

    It is all installed into a 98 Honda Civic Hatchback EK.

    The sub, 2nd battery, and amps are all in the trunk. I have a separate ground for each amp and 2nd battery. My HU is still using the OEM ground.

    I have tried moving the ground for my 4 channel amp to different locations but no matter where i place it, I get ground loop noise. (It's not the whining noise).
    I have sanded thru the paint to the metal then grounded and even tried oem screwed locations such as the spare tire screw and the rear seat screw. All no-go.
    I bought a multi-meter to help but I am now more confused with what to do with it.

    If any of you has any suggestions at all, please share. Thanks!!!

    (If you have a similar car - where did you mount your ground?)

  • #2
    Are your amps touching metal anywhere? that could do it
    Aron
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    • #3
      Originally posted by boomintrac View Post
      Are your amps touching metal anywhere? that could do it
      Aron
      not that i can see.... i thought that too, but there is carpet behind the back seats so they are not in direct contact

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      • #4
        First, what does the noise sound like?

        Does it change with engine speed?

        Is it there when the engine is off?

        Does it change with components turned on and off? (ie:fan, etc)

        Do you have power wires running parallel with signal wires? Or bundled together?

        try unplugging the RCA's to each component (seperately) and see what happens.

        Try disconnecting power to each amp seperately and the 'puter.

        Ground loops are a real PITA sometimes, you just have to keep chasing it..........

        Good luck
        For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
        Leonardo Da Vinci

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        • #5
          ground all your components in the same location with the correct wire gauge size.
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          • #6
            Originally posted by greatwhite View Post
            First, what does the noise sound like?

            Does it change with engine speed?

            Is it there when the engine is off?

            Does it change with components turned on and off? (ie:fan, etc)

            Do you have power wires running parallel with signal wires? Or bundled together?

            try unplugging the RCA's to each component (seperately) and see what happens.

            Try disconnecting power to each amp seperately and the 'puter.

            Ground loops are a real PITA sometimes, you just have to keep chasing it..........

            Good luck
            -Doesn't change with engine speed. It is not there when engine is off. Does not matter if components are off/on. RCA wires are parallel w/ power cables except the Rem cable. Thanks so far man!

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            • #7
              r u sure?

              Originally posted by dMand View Post
              ground all your components in the same location with the correct wire gauge size.
              I have heard different things - to ground in different locations and then at the same location.....

              which is better? just tired of sanding and adding another hole to my car

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              • #8
                Originally posted by saounyang View Post
                -Doesn't change with engine speed. It is not there when engine is off. Does not matter if components are off/on. RCA wires are parallel w/ power cables except the Rem cable. Thanks so far man!
                Well, that's some progress.

                If it doesn't change with engine speed, it's not alternator whine. Same with fan, AC, etc.

                Not there when the engine is off indicates it's something grounding out through your audio equipment or there might be some noise induced into your rca's from the power wires.

                Try seperating your power and signal wires and see what happens.

                Something that a lot of people forget is that modern cars all have electric fuel pumps and they've got to me some of the "noisy-est" motors I've even dealt with. Installing your equipment, running wires parrallel to the power path or grounding near it usually produces mind numbing noise you can't seem to find no matter what tricks you use. If you've grounded your system under the rear seat this could also be a problem as that's where most modern cars have thier fuel tank and thus, the fuel pump and harness.

                Grounding your components to the same point is usually good advice, it's makes all the gound paths equal in resistance, but it's not always the cure.

                I've moved a ground point 6 inche before and cured a ground noise, sometimes it's just that simple.

                The quality of your components might also be an issue if you have lower end stuff (amps, connections etc). There's a noise "floor" in every piece of audio equipment. Cheaper stuf fis usually noiser.......

                Cheers
                For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
                Leonardo Da Vinci

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                • #9
                  are you running component speakers? if so... where are your crossovers mounted? i had this problem once b4 in a vette. if the crossovers are too close to a power wire or just a random accessory wire... they pick up whine. kinda the same effect as if you were to put a neon light too close to an amplifier.

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                  • #10
                    Sounds like your did all your homework for this one, so leaves me to believe it's either a bad amp? Or if you are using your oem head unit with a line converter (line to RCA), those are really pretty common to cause noise!

                    Rule of thumb always start by replacing your stock head unit first. Then upgrade from there. Even if you just go with a $200.00 Kenwood HU with RCA outputs your going to have a much better sound. Even from stock speakers. This is because the HU is the brains of your system!

                    Just my 2 cents.

                    Good luck!

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                    • #11
                      Normally i run a ground back to the 4ch amp from the radio to diffuse the "loop noise". The only thing that makes me scratch my head is that its NOT there when the engine is off. There for it has to b somthin thats makin the RCA's pick up noise some where along the lines. When the engine is on. AKA a blower motor, fuel pump, ETC........

                      How are the RCA's routed from your HU to the amp? Are the near the AC blower? Cig lighter plug?

                      Also your RCA's should not be run down the same side as your power wire. Just somthin i try to avoid at ALL costs. Try the ground from HU to 4ch amp first. That should solve it. LMK and well go from there

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