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Not Engine Noise but static

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  • Not Engine Noise but static

    I've had my pc in my car about 6 months now. I have a HP slim line pc being powered with an inverter I just added a kicker 3504 4ch amp and a kicker 7501 sub amp Im using the onboard sound card right now using 3.5 mm to rca adapters to the amps using front rear and sub outputs. I am not encountering any engine noise or whine but I'm getting a low level static through all speakers. when i remove rcas from amps there is no noise its only while playing music from computer. Any ideas??

  • #2
    Chances are your soundcard isn't outputing a high enough voltage for your amps, forcing you to set the gains on the amp to high. But just in case...
    If you unplug the RCA's from the soundcard is there still noise?

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    • #3
      forcing you to set the gains on the amp to high
      REBUILDING!!

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      • #4
        I have another thing to check! This happens a lot with power inverters. Where did you get your power from? If you are using the cigared lighter jack then the power may just be "dirty"! I've seen this quite a bit. Try moving to a more reliable area. I suggest you tag power at an Ignition or Accessory wire in the ignition column (please do not use fuse splices at the fuse box). And get a fresh ground in the kick panel. This is always the best route for getting power to major, sensitive components. I almost guarantee this will solve the issue. If not then try getting a higher quality inverter with better filters, but not until you move your power and ground!

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        • #5
          ^^^^ Although this is true and could help the issue, the signal level output of a standard sound car is about 0.1-1v. So even with a cleaner power supply to the computer your still going to need some kind of pre-amp so as to not max out the gains on the amp. You can check the voltage output of the soundcard with a multimeter.

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          • #6
            I'll turn my inverter off and try using regular ac power from a outside source and see if the noise is still there. If it is what external sound card could you suggest? My pc has 1 free pci but it is so small that I can't install anything internal

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            • #7
              Any suggestions on the preamp?
              2004 Ford Mustang

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              • #8
                I believe there is a thread on this topic.. no wait theres two.. I think you should search.
                REBUILDING!!

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                • #9
                  turned out one of my ss component woofers were blown and causing the static replaced it today and sounds awesome

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                  • #10
                    the hiss was coming purely from the subwoofer?
                    REBUILDING!!

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                    • #11
                      Originally posted by Dragonknell911 View Post
                      the hiss was coming purely from the subwoofer?
                      Yeah, that would have been good diagnostic info to have.

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                      • #12
                        no the sound was comming from tweeters the woofer was shorting internally casuing all the problems

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                        • #13
                          so your front components and subwoofers are powered by the same amp?
                          REBUILDING!!

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                          • #14
                            no nothing was wrong with subwoofers. the 6.5" component woofer was bad and causing all speakers on 4ch amp to generate static

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                            • #15
                              So you never got static out of the sub and no sound was coming out of the tweeter even though you said the static was coming from "all speakers".

                              Anyway, glad you figured it out.

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