Page 3 of 6 FirstFirst 123456 LastLast
Results 21 to 30 of 56

Thread: Ewww, ground noise finally isolated, now wut!?

  1. #21
    Constant Bitrate Specimen's Avatar
    Join Date
    Jul 2005
    Location
    Los Angeles, CA
    Posts
    153
    Nice sketch, it actually helps a lot. So do you get the static/whine on ALL the speackers, including subs or only a select few?
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

  2. #22
    FLAC sdashiki's Avatar
    Join Date
    Aug 2004
    Location
    Floreeda
    Posts
    1,084
    cant tell with the subs of course, their freq. response isnt high enough.

    but yes all of the speakers (though I only put my ear to the tweets) have the same noise.
    (0.0%-) starting over
    iPad 3G 64GB, RF 600.5 amp, JL10W0V2, 8 Infinity Components

  3. #23
    FLAC TheLlama's Avatar
    Join Date
    Jul 2004
    Location
    All over the world
    Posts
    970
    What happens when you play from an audio source that is not power by or grounded to the car? Try unplugging the head unit and instead use a handheld cd-player, laptop, gameboy, or even home stereo equipment hooked up to your A/C line of your residence. Let us know if this fixes (or reduces) the problem.

  4. #24
    Constant Bitrate Specimen's Avatar
    Join Date
    Jul 2005
    Location
    Los Angeles, CA
    Posts
    153
    funny I was going to suggest the same thing I just didn't want to overwelm him with suggestions.
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

  5. #25
    FLAC sdashiki's Avatar
    Join Date
    Aug 2004
    Location
    Floreeda
    Posts
    1,084
    Alright, so we are all on the same page:

    the noise is there EVEN when there is NO RCAs connected to the amp.

    which means somewhere between the amp to the crossovers to the speakers there is noise.

    The HU, and any other source, is out of the picture, we are solely looking at the AMP as the source of the problem.

    Though I did connect my iPod to the rear speaker input on the AMP, no difference.

    In case you didnt notice, this is a very hard to find amp and I am not in the mood to part with it, to replace it with a similar powered amp is hundreds and hundreds of dollars.
    (0.0%-) starting over
    iPad 3G 64GB, RF 600.5 amp, JL10W0V2, 8 Infinity Components

  6. #26
    Variable Bitrate
    Join Date
    Aug 2004
    Posts
    316
    Will's post is spot on. Follow his directions, if you dont understand them, read them slower.

    He's trying to help you figure out if your amp is buggered. get a Multimeter, do the tests. It's the only way to find out!

    Just by practice, I always tie the power and ground of the amp to the power and ground of the deck. Some say it's not necessary, but since doing so I have never encountered a system with noise. In your case, it may not help, as it appears you may have an amp issue.

    Even on your second ground that you re-did, it doesnt seem like the paint is scratched off in the pic. make sure you're sanding it down to the point where the metal is shiny underneath.

    Maybe your grounding location is just not good. take a good look at the floorpan and make sure you are grounding to the chassis, not a bracket or brace that is spot-riveted to the chassis.

    If all still appears to be well, check your battery and engine ground to the chassis. So this is the wire from the battery ground to the chassis, and the one from the engine to the chassis. Both these should be 4g or bigger, both should be in good condition, and should also be on grinded-down bare metal (often they are just small and bolted onto painted metal from the factory).

    if you still cant find the problem then just try another amp.

  7. #27
    Constant Bitrate Specimen's Avatar
    Join Date
    Jul 2005
    Location
    Los Angeles, CA
    Posts
    153
    I would try bypassing the crossover and see if it gets better/worst. That is if it isn't too hard to get to the crossovers. That way we can eliminate the crossovers in the equation and truly pin the amp as the problem. You run a risk of ground loop problems anytime time two components are passing audio to one another and each component is grounded differently (ie different gauge wires, GND locations, or anything that might affect a difference in ground potential).
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

  8. #28
    Variable Bitrate proph's Avatar
    Join Date
    Aug 2005
    Location
    Little Elm, Texas
    Posts
    422
    Man everyones thought process, and plans of action can really vary. No muting plugs/relocating the deck? The reciever was never discussed yet. Pioneers are know for having the resistor blow on the pcb which connects the ground to rca ground. Take a piece of wire of 18 gauge or better, and jumper from the outter shell of the rca to the ground. I'd bet that fixes it.

  9. #29
    FLAC sdashiki's Avatar
    Join Date
    Aug 2004
    Location
    Floreeda
    Posts
    1,084
    Quote Originally Posted by proph
    Man everyones thought process, and plans of action can really vary. No muting plugs/relocating the deck? The reciever was never discussed yet. Pioneers are know for having the resistor blow on the pcb which connects the ground to rca ground. Take a piece of wire of 18 gauge or better, and jumper from the outter shell of the rca to the ground. I'd bet that fixes it.
    if you would read the thread, its narrowed to down the AMP, with no HU connected to the AMP, there is still noise.

    Anyway, I just got done with a MM, check from the gold connector on the AMP to the bare metal spot I chose, 0.00 resistance. Is this sounding more and more like the AMP is ****ed?

    I have yet to take a long probe wire and go from the neg terminal on the battery to the bare spot I chose.....
    (0.0%-) starting over
    iPad 3G 64GB, RF 600.5 amp, JL10W0V2, 8 Infinity Components

  10. #30
    Constant Bitrate Specimen's Avatar
    Join Date
    Jul 2005
    Location
    Los Angeles, CA
    Posts
    153
    All things are pointing to the amp, but you can't say for sure if that’s the complete cause yet since you still have other components your passing audio to (the crossovers). I would agree with Vinister to follow Wills advice by creating ground plugs. Since nothing is plugged into the input of the amp, the audio out positive wire will be at some voltage potential (floating maybe) while the ground is fluctuating causing the whine, creating those plugs will bring the positive audio out to the same voltage potential as the ground audio out. This should create no noise out of the speakers. From there, we can probe a little more on what might be causing it. (bad amp, bad ground, etc).
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

Page 3 of 6 FirstFirst 123456 LastLast

Similar Threads

  1. The quest for no noise
    By mp31500 in forum General Hardware Discussion
    Replies: 26
    Last Post: 04-02-2007, 10:12 PM
  2. Noise!! AARGH!
    By sq_geek in forum General Hardware Discussion
    Replies: 23
    Last Post: 09-21-2004, 01:33 PM
  3. Learn and fix ground loop noise
    By 14.4vTech in forum Car Audio
    Replies: 3
    Last Post: 07-03-2004, 08:55 PM
  4. stupid ground noise!
    By EvilInside944 in forum General Hardware Discussion
    Replies: 2
    Last Post: 08-14-2002, 10:29 PM
  5. Alpine / PC Challenges all around...
    By acitrano in forum General Hardware Discussion
    Replies: 5
    Last Post: 11-10-2000, 07:45 AM

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
  •