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Thread: 2012 D4 TDV6 Harmon Kardon sound issues

  1. #21
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    Thanks Jeff

    I am Meridian- so the Amp is in the back

    I am in the same mind that it may not be the speakers

    But I have already replaced both head unit and Amp
    With no change

    So unless there is something else in between AMP and speakers it can only be the wire or the speakers- right ??

  2. #22
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    oooh - fancy, Meridian

    I still thought there was an amp under drivers seat though? There certainly is in the earlier models...

    Looking at the wiring diagram, the amp cable connector for all the high range speakers is separate from the sub and low range - C0491 for bass, C0492 for the high/mids. High and mid speakers run off the same cable from the amp, and split at the speaker using the crossover mentioned earlier. Is it possible there is corrosion in the amp plug?

    I'm not full bottle on the setup you have - are there also headphone jacks in the doors? Could one of these have gotten wet or something else in it, and shorted out, to send the car into a state where it thinks it needs to cut speaker sound in favour of headphones? Maybe plug a headphone into each port if they exist, and free them up?

    You don't have an IID tool or similar do you, that could read fault codes from the car?
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), BFG KO2 for play

  3. #23
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    Thanks Veeb
    I don’t think there is “another” amp under the drivers seat but will check

    This is driving me mad!!

  4. #24
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    Update

    Pulled the panels off the doors
    No surprise all speakers working

    Just NO BASS or Mid tones

    Circling back to the AMP or head unit
    Sigh

    This is doing my head in

    As I understand it

    1. Head unit processes the audio
    2. Sends audio digitally via fibre optic to the AMP
    3. AMP then de-encodes the data - splits it per channel and pumps it out

    So either the AMP is busted or the head unit - BUT as I have replaced both (albeit with 2nd hand gear)

    WTF!!! What else could it be?

  5. #25
    BradC is offline Super Moderator
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    Have you got the RSE and DVD player? Only ask because that supplies audio to the AMP using SPDIF and not the MOST loop so it'd be a separate source to test with.

    I guess the next question is do you have sound coming from each individual speaker? You can use a bit of hose as a stethoscope to listen to each one as you move around the car.

    Wish you were in Perth, this would be a fun diagnostic.

  6. #26
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    2012 D4 TDV6 Harmon Kardon sound issues

    Thanks BradC
    So do I

    No only the head unit
    And I put my ear to every speaker- all working
    (But no bass or mid tones coming from the big speakers)

    Question - I did notice that the MOST (Fibre) is a daisy chain - but I did notice yesterday that …. When I unplugged the MOST connector from the AMP only ONE of the lines was lit

    I also remember that when I was replacing the head unit - there was only one lit there as well??

    Could the cable be stuffed and that’s why this is all happening ?

    Cheers
    Foz

  7. #27
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    Strike that

    It’s a loop - and have checked by shining lights down cable

    Argh!

  8. #28
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    Quote Originally Posted by Fozzie View Post
    Thanks BradC
    So do I

    No only the head unit
    And I put my ear to every speaker- all working
    (But no bass or mid tones coming from the big speakers)

    Question - I did notice that the MOS (Fibre) is a daisy chain - but I did notice yesterday that …. When I unplugged the MOS connector from the AMP only ONE of the lines was lit

    I also remember that when I was replacing the head unit - there was only one lit there as well??

    Could the cable be stuffed and that’s why this is all happening ?

    Cheers
    Foz
    One line is in aka receive and one line is out aka transmit. The device it’s connecting to will retransmit on the unlit line.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  9. #29
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    Continuity of speaker outputs?

  10. #30
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    Quote Originally Posted by Tombie View Post
    Continuity of speaker outputs?
    Hi Tombie

    Could do with your help - thanks

    I have tried to test them but tricky with the plug

    I have “listened” to each speaker and each is putting out sound
    - but -
    the low frequency speakers in each door SEEM to not receiving or putting out the low frequency sound(only the higher frequencies)

    I am starting to think that there is a gain issue in the Amp?

    And As I have replaced the amp with a wrecker one - it is I suppose possible that the same had happened to THAT amp

    Argh this is a pain

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