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Thread: Is the amp at fault?

  1. #1
    Variable Bitrate Tim Lake's Avatar
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    Is the amp at fault?

    I have had no end of trouble with alternator whine feedback on my audio.
    I have checked the grounding and redone them all at least twice. I have ground loop isolators on everything and those little magnetic clip jobbies that go round the wires.
    I have NEVER been able to shift the feedback completely. Now I have fitted my new computer touchscreen and everything it's back with a vengeance!

    I have a lot of earthed stuff (two amps, active crossover, computer startup controller, screen) and they are all solid earths!

    If I remove the fuse from the 2-way amp (which goes to the components) then it stops. Is it possible/likely that the amp is at fault and is there a way to find out without replacing the amp?
    VIA M10000
    512Mb RAM
    30Gb 2.5" HDD
    Bluetooth, 802.11g, GPS
    Silverstone USB DAC
    Consult (ODB)
    CarTFT K500
    Carnetix P1290
    NLited XP with Road Runner and MapMonkey

  2. #2
    Variable Bitrate Tim Lake's Avatar
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    bump
    VIA M10000
    512Mb RAM
    30Gb 2.5" HDD
    Bluetooth, 802.11g, GPS
    Silverstone USB DAC
    Consult (ODB)
    CarTFT K500
    Carnetix P1290
    NLited XP with Road Runner and MapMonkey

  3. #3
    FLAC
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    Did you isolate and follow the steps i posted in the stickies at the top? You need to start pulling out components.

  4. #4
    FLAC
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    Did you by any chance upgrade your battery and engine grounds?

  5. #5
    Variable Bitrate Tim Lake's Avatar
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    @Will : I have disconnected things in turn and it does seem to be the amp. If I pull the fuse from that amp then run the car there is no feedback at all.

    @Shadow: No I didn't do either of those.
    VIA M10000
    512Mb RAM
    30Gb 2.5" HDD
    Bluetooth, 802.11g, GPS
    Silverstone USB DAC
    Consult (ODB)
    CarTFT K500
    Carnetix P1290
    NLited XP with Road Runner and MapMonkey

  6. #6
    FLAC
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    if you pull the fuse from the amp, there is no sound at all, therefore no feedback.

    If you plug a pair of headphones into the compuetr sound card, do you hear the noise?

    What happens if you go directly from the carouter to the amp?

  7. #7
    FLAC
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    In a PC case the power supply and motherboard share a common ground. If you're using a non-standard PC case then you should check into this.

  8. #8
    Variable Bitrate Tim Lake's Avatar
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    I have two amps and the other one is still on but doesn't cause the feedback.

    I already go direct from the carputer to the amp (thanks to your prior advice).

    I haven't tried the headphone thing yet but I will do and let you know.
    VIA M10000
    512Mb RAM
    30Gb 2.5" HDD
    Bluetooth, 802.11g, GPS
    Silverstone USB DAC
    Consult (ODB)
    CarTFT K500
    Carnetix P1290
    NLited XP with Road Runner and MapMonkey

  9. #9
    FLAC
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    ahhh, ok, so one causes feedback and the other does not? VERY interesting. Are both amps grounded to the same spot? Have you tried using a test speaker? same thing?

  10. #10
    Variable Bitrate Tim Lake's Avatar
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    They aren't grounded to the same spot cos the mono amps grounding spot is now VERY difficult to get to. The component amp does have a good solid ground.
    How do you mean, use a test speaker?
    VIA M10000
    512Mb RAM
    30Gb 2.5" HDD
    Bluetooth, 802.11g, GPS
    Silverstone USB DAC
    Consult (ODB)
    CarTFT K500
    Carnetix P1290
    NLited XP with Road Runner and MapMonkey

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