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Thread: Alternate sound

  1. #11
    Maximum Bitrate pepsibobby's Avatar
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    i had really bad noise as well and i put in a loop and it took 98% of the noise away. I would suggest it, its 20 bucks woth a shot.
    Cant code cause I dont know how, but give me the paint bucket and my eraser and have at you!

  2. #12
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by GoHybrid
    I believe I've confirmed my theory. With the mac plugged into the AUX input, and the power connectors from the p1900, the P1900 will run without a ground. As soon as I remove the headphone plug, the power supply shuts off. Before I start dropping money, does anybody agree that a ground loop isolator would solve this by eliminating the ground path through the RCA plugs?
    Wow. Talk to Mike about that.
    You might also check the ground on the rest of your system. (the definition of a ground loop is two or more ground points causing different frequencies).

    [further testing included running off wall AC which yielded zero noise, inverter AC which was almost as good. the P1900 is the only part that seems to want to ground anywhere but where it should.]
    A ground loop is unquestionably the issue. Now it's just a matter of finding it.

    Do mean that you still have some noise using an AC inverter? If so then looking at your other points in the system is probably the best place to start.

    As far as an isolator, I got lucky and didn't have a problem so i've never used one. The Audio forum is the best place for this kind of info (not trying to run you off, just pointing you where I think you can get the best help).

    -dave

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  3. #13
    Maximum Bitrate GoHybrid's Avatar
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    It was absolutely a ground loop. The two grounding points being directly to the chassis from the P1900, and through the RCA shields between the mac and the head unit. I purchased a ground loop isolator and it fixed the problem 99.99999 (just because i'm picky) percent. But i'm glad to have it solved. I started the thread here because i had concluded (prematurely) that it was an issue with the mac itself. In any case, all's well that ends well. I'm still getting funky behavior from the P1900, but everything continues to boot and run fine otherwise.

    To all who responded, thanks again for your help. I'm always amazed at the collaboration and support that goes on here.

    I can't wait until all audio signals are digital/optical. light beams don't muck about like electrons do ;-)
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  4. #14
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by GoHybrid
    To all who responded, thanks again for your help. I'm always amazed at the collaboration and support that goes on here.
    That's what we're here for

    Glad it's fixed.

    -dave
    My pathetic worklog.
    CarFrontEnd (now it's own sub-forum!!!!)

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