Results 1 to 7 of 7

Thread: ground loop question

  1. #1
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515

    ground loop question

    ok question about groundloops my issue is this with the pc bolted into the car it i turn it on with it hooked up to the battery it sounds like someone running there fingers over a mic if i touch any metal on the car you hear that as well, now it i leave it mounted and plug it into my bench supply it sounds perfect no noise or anything. All my grounds are tight i have the power run straight from the battery using a 8ga wire. I have yet to pickup a groundloop isolator i figured i would pickup one this evening but thought I would ask first to see if anyone had an idea first.

    Thanks,
    yonu

  2. #2
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515
    well I have been unable to find a Groundloop isolator so I will have to wait on that. just to see what happend I connected mt bench supply to my 200watt inverter and there is noise but not as bad as straight from the battery but I am a bit confused as I was thinking it may have been my m2 causing the noise but i have feeding it 12v whether it is from the battery the bench supply or the inverter so i don't think the m2 is the problem I have tryed 3 sets of rca cables and that doesn't help so any advice would be great

  3. #3
    Constant Bitrate thewizard's Avatar
    Join Date
    Dec 2008
    Posts
    141
    The symptoms that you describe are pretty much unmistakable and I don't think that a ground loop isolator will help you, in fact more than likely if you hook a set up you will loose all audio all together because they will shield the RCA's from being able to loop the ground back. The reason is that you are clearly pulling your RCA ground from your power ground rather than from the RCA's ground. What are you using for a sound card? You could try grounding your RCA's and see if that helps, but sometimes in doing so can cause you pick up some alternator whine in the process. If you are using an external sound card then try using the onboard sound to see if the external unit is the source of the problem.
    Data911 M5 system
    RR and iGo8PC
    Pioneer head unit
    Pioneer DEQ-9200 digital processor
    Phoenix gold line drivers
    Ultimate and Visonik amplifiers
    SMT 3 way active front stage
    Digital Design sub woofers
    3 runs of 0 gauge wire

  4. #4
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515
    I am using onboard sound I have tried grounding the rcas and it has no effect is there anyway this could be caused by the m2-atx?

  5. #5
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515
    i just thought of something that may help my case is a metal box the rcas, power in and power out for monitor are all metal connectors panel mounted into the side of the box so with no power if you take a volt meter all the shells read as connected could this be causing this problem? and also I tryed a separate 3.5mm to rca adapter that plugged straight to the HU and motherboard and it is still there. if it helps the HU aux in is a homemade pioneer cd changer adapter

  6. #6
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515
    well I may have found the problem I think it may have been the motherboard as the board died about 20min after my last post so I am back to square one as I have to go motherboard shopping

    Thanks,
    yonu

  7. #7
    Maximum Bitrate
    Join Date
    Jan 2005
    Posts
    515
    question i figure while I am dealing with getting a new MB and PSU I want to find out do I need to find a way to insulate the connectors from the metal case or is it ok like that?

Similar Threads

  1. Good read on ground loops
    By coffeejolts in forum Car Audio
    Replies: 6
    Last Post: 04-28-2008, 02:30 PM
  2. Help me with my Ground Loop?
    By easy in forum Car Audio
    Replies: 4
    Last Post: 04-25-2008, 05:37 AM
  3. Eliminating Ground Loop
    By norbie in forum Car Audio
    Replies: 32
    Last Post: 08-11-2006, 01:56 AM
  4. ground loop problem... cant fix it
    By okeydokey in forum Car Audio
    Replies: 9
    Last Post: 06-23-2006, 09:27 AM
  5. Strange ground loop problem.
    By norbie in forum Car Audio
    Replies: 5
    Last Post: 06-18-2006, 03:25 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •