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XM Noise

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  • XM Noise

    This may be the wrong place for this,so dont beat me up please. I just know that one of you will see this and quickly get me going in the right direction. I have looked and looked and all the solutions I am trying are not working.

    My PROBLEM is noise after connecting my XM commander to my carpc.

    First let me describe the noise. It IS a sort of alternator whine but not crazy bad. During talk radio it is annoying and at high volumes listening to music it also can be heard.

    My Setup:
    The xm's audio out, goes into a rca to 1.8 male connector into the input on the carpc.
    When the car is in the ACC position, there is no noise, so I think I can rule out the internal fans and such in the pc?

    When the car is on and running you get the noise of course.

    While the car was running, pulled the the input from the XM out attached a coupler and stuck in some headphones and listened for the noise and it was as clear as it should be.

    Next I ran a portable mp3 player through the linein as the car is running and no noise either.

    However I connect it all back and there is noise.

    SO, I went to ratshack, and my freind there let me test the monster cable rca to 1.8 male and its sheilded all sorts of ways.
    I put that in place and there was no differance what so ever.

    My grounds are all in the same place, under the backseat, scratched paint till I saw metal and used a sheetmetal screw and eyelets that are crimped and bolted to the floor.

    Im out of ideas on what to do other than get a GL and I hear that will reduce audio quality so I have not done that yet.

    This is what I had | Then sold it all | | | |

  • #2
    upgrade your grounds under the hood and then recheck your other grounds. also, have you put any after market plug wires in or high output coils? they will create noise to no end.


    • #3
      Nothing after market installed.

      So what exactly do you mean upgrade the grounds under the hood? Do you mean relocate my ground to somewhere under the hood?
      This is what I had | Then sold it all | | | |


      • #4
        No - the ground wires from battery to chassis, and alternator to chassis.


        • #5
          Originally posted by digeratix View Post
          Nothing after market installed.

          So what exactly do you mean upgrade the grounds under the hood? Do you mean relocate my ground to somewhere under the hood?
          Do an internet search on "Big Three" in the audio forums. the big three are batt to alt, batt to chassis, chassis to engine. I had to do it on my mustang cause the original wiring just wasn't enough and it cleared up the last little noise out of the XM Commander for me.

          Also, on my Caddy, I found out placement makes a big difference with the Commander. I first had it in my center console under the radio and when I moved it to the passenger kick panel the sound was clean. Another thing the folks here told me to do was run an additional ground from the XM board and box to the same place the other audio/computer grounds are connected to the chassis.

          Hope that help.


          P.S. A a side note, the Commander has been known to overmodulate its audio out. I use the Commander headunit to turn down its preamp all the way to help eliminate as much as possible. Its also is handy for insuring the FM modulator is off.
          HARDWARE: Fujitsu Stylistic ST5111w/WiFi and dock, internal Hitachi 500G HD, external 1TB HD, Sierra Wireless Aircard 550, DVD-RW, BoomzBox HD radio, XM Commander, Delorme GPS, Saitek X-52 Pro joystick, BluSoleil Bluetooth, TPMS, FB, Elm327