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

  1. #41
    FLAC sdashiki's Avatar
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    mounted to MDF, the sub box.

    just made the mute plug by twisting all 3 of the wires into one, and connecting the 2 RCAs to the rear input on the amp, no change at all.

    moved the remoteon, no change.

    car off, HU on...no RCAs plugged into amp, speakers "hiss" (no the gain isnt too high)

    car on, HU on...no RCAs plugged into amp, speakers "static" + "engine whine"


    maybe another test would be to connect the wire outputs of one speaker from the HU (currently unused) and connect that to one of the crossovers, bypassing the amp....no noise means its the amp...noise means its the crossovers...?
    (All done)
    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

  2. #42
    FLAC
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    Quote Originally Posted by sdashiki
    mounted to MDF, the sub box.

    just made the mute plug by twisting all 3 of the wires into one, and connecting the 2 RCAs to the rear input on the amp, no change at all.

    moved the remoteon, no change.

    car off, HU on...no RCAs plugged into amp, speakers "hiss" (no the gain isnt too high)

    car on, HU on...no RCAs plugged into amp, speakers "static" + "engine whine"

    Does the amp have a button that allows the whole thing to work off of one set of RCAs? So all you have to do is plug the RCAs into the front channel inputs and the whole thing works? If so, lets keep that enabled.

    The plugs tell me that its not RFI through the amp, yet it could still be a burned ground on the input section. Do the test with a spare speaker like i listed above. If the noise is still there, its the amp.

    From a repair perspective, this is common with RF. Take it to a repair shop. If you are near Buffalo NY or want to ship, HiFi Hospital is a good place. Just let them now i sent you. 716 633 1088

  3. #43
    Constant Bitrate Specimen's Avatar
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    Quote Originally Posted by Will Albers
    I wonder if he is getting RFI through the passive crossovers? Just a thought...

    Do you have the amp mounted to metal using metal screws?
    I had the same thought about the crossovers also.

    I don't think he has it mounted to metal. If I recal he said it was mounted on the sub box.
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

  4. #44
    FLAC sdashiki's Avatar
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    naw, 6 inputs, 6 outputs.

    I think ill try to test the crossovers tonite.

    but 4 crossovers, in two seperate locations...would be a long shot.


    Quote Originally Posted by Will Albers
    From a repair perspective, this is common with RF. Take it to a repair shop. If you are near Buffalo NY or want to ship, HiFi Hospital is a good place. Just let them now i sent you. 716 633 1088
    if it does turn out to be the amp, its repairable in the right hands?
    (All done)
    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

  5. #45
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    Quote Originally Posted by sdashiki
    naw, 6 inputs, 6 outputs.

    I think ill try to test the crossovers tonite.

    but 4 crossovers, in two seperate locations...would be a long shot.




    if it does turn out to be the amp, its repairable in the right hands?
    Absolutely

  6. #46
    FLAC sdashiki's Avatar
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    Alright, did some experimentation.

    Connected HU to right rear crossover. Noise still present....

    Connected HU to right front crossover. No noise...but....

    ...but what is weird, is that I have the amp off (remote on cable disconnected) and the left rear tweeter HAS NOISE!? How can this be I say? There is NO signal going to it period, the crossover is passive so it has NO power!

    So I disconnect the left rear crossover from the amp (which is off) and the sound disappears. SO i left the + wire from the crossover connected to the amp and moved the - wire around the different - connections on the amps output, and each produced some noise thru this crossover.

    So what the hell is going on? Is it the crossover? Is it the amp?

    I still need to connect a speaker thru the amp, with RCAs disconnected and see if the noise is present. But as it is, could be a single crossover, or the amp?

    I mean the tweeter made the noise, with no signal that was active. It was connected to the woofer, tweeter and amp. The amp still had the RCAs connected, but it was not powered on because the remote switch was disconnected. I am stumped.
    (All done)
    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

  7. #47
    Constant Bitrate Specimen's Avatar
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    That's the problem with ground loops. It isn't always 1 component, but rather it could be the combination of the two components connected together. Not connected they might individually work fine but connected you might have a loop problem.

    I would do what Will said and connect a speaker (just the speaker no crossovers in between) to each of the amp's out lines and see if you hear the buzzing/whine.

    As for that phantom noise, even though the 'amp on' is not connected, the power is still connected to the amp so the amp is probably sending a faint signal to all the speakers. And if your crossovers are causing the problem the noise will be induced into this faint signal and you will hear the noise even though you think the amp is off.
    PROGRESS [==========-] 99.9% <- Are we ever really actually done with our carPCs?

  8. #48
    Maximum Bitrate SAScooby's Avatar
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    check my earlier post about a speaker grounding, you may have a speaker terminal touching the car body, thereby introducing a different ground or you may have a pinched wire doing the same thing somewhere.

    Speakers must not be grounded in any way and wires must not be pinched / damaged etc
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  9. #49
    FLAC
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    Factory amp?

    Did you say you ran new speaker wires to all speakers? Or did you tap into the factory wiring?

  10. #50
    FLAC sdashiki's Avatar
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    factory wiring was used for the woofers. since they are in the door.

    I have the crossovers woofer out going to the wiring harness in the dash.

    just tested the AMP outputs by removing a tweeter from a crossover and connecting it directly to the amp (no sound was playing, I was just listening for noise, so the fact it got full range doesnt matter).

    I touched the tweeters -/+ wires to the outputs on the amp, everyone produced noise.

    What was truly weird was that I only need to put one of the wires on one contact (either + or -) to get the noise.

    I still would like to take a speaker thats NOT instaleld in my car and test the amp, but its 98% positively the amp, right?
    (All done)
    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

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