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Bluetooth interference/background noise

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Jimmy mac, Jan 13, 2013.

  1. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    Hi All

    New to the forum, this is my first post so hope it's in the correct place. I have recently retrofitted RNSE, MFSW and bluetooth (genuine audi parts) to my 2007 2.0 sline dsg A3. Everything working fine however background noise for telephone call recipients at speeds of even 30mph is terrible (got the wife to drive the car and call me). Everything was brand new and no cables were damaged when installing. Not sure what to try now, is this noise to be expected. I have never had this level of background noise on any of my aftermarket handsfree kits.

    Thanks in advance.
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  3. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    Genuine vw/audi mic in the light cluster? What loom did you use - kufatec?
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  4. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    Hi Phil used genuine vw/audi mic with genuine harness, installed in light cluster. Could it be incorrect coding, if you mute the mic through the rnse the noise stops as stupid as that may sound does that rule out interference?
    Last edited: Jan 13, 2013
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  5. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    If its definitely not background hiss but rather car / wind noise I would double check the placement of the mic - maybe do a test with the mic dangling out of the cluster to see what the difference is?

    Everyone I've fitted has just worked apart from one where the mic was faulty ( but it didn't work at all)
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  6. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    Thanks, if its background hiss is there something in particular you would change, ammend or replace? I will take a drive today with the mic dangling as suggested.
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  7. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    Depending on where the mic came from might be a light chance the wires are the wrong way round from the mic? Probably not though..,
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  8. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    Make that 'slight chance' :)
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  9. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    Worth checking part numbers too - can you list them here of all the bits?
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  10. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Jan 13, 2013]
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  11. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    Here is the eBay item I purchased, I placed unit behind/under glovebox, it would appear harness is not genuine audi then. At standstill no noise at all, it appears then that mic is too sensitive. The wire was routed behind dash up pillar to light cluster. I have tried swapping wires with no success, when you do this you can not be heard at all.

    Audi A2/A3/A4/A6/TT Genuine Bluetooth | eBay
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  12. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    I purchased Ebay item:

    Audi A2/A3/A4/A6/TT Genuine Bluetooth | eBay

    i have tried swapping mic wires it does nothing it all. There is no interference noise at standstill, just awful at 30 -70 mph. I can be heard clearly but the background noise is shocking, could the mic be over sensitive? Can this be adjusted. I had a drive with mic hanging down no improvement.
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  13. Jonse
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    Jonse Active Member

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    [Jan 13, 2013]
    I there mate, I had this aswell but i have the kuftec one. People had said they i had background interference but then i adjusted the volume of the mic, which has no solved that. I adjusted it by calling a number through the RNSE. I dont know if this is just to adjust for the kuftec kit all off kits.
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  14. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Jan 13, 2013]
    The module & microphone are genuine but the wiring harness is not, also the BT antenna looks rubbish and could be causing problems this is the genuine item
    1872_0.jpg
    You may want to check the adaptation setting as the sensitivity my have been turned up.

    A131,0,Microphone Sensitivity
    A131,5,Microphone Sensitivity
    A131,6,Microphone Sensitivity Adjustment
    A131,7,Range: -6...+6 dB
    A131,8,
    A131,9,0 = ±0 dB / 1 = +1 dB / 2 = +2 dB
    A131,10,3 = +3 dB / 4 = +4 dB / 5 = +5 dB / 6 = +6 dB
    A131,11,128 = -1 dB / 129 = -2 dB / 130 = -3 dB
    A131,12,131 = -4 dB / 132 = -5 dB / 133 = -6 dB
    Last edited: Jan 13, 2013
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  15. Jimmy mac
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    Jimmy mac New Member

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    [Jan 13, 2013]
    Ok I have checked the setting the microphone sensitivity is set at 0. Changing it to 5 seems to reduce road noise are there optimum settings for this?
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  16. phil_w
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    phil_w Member VCDS Map User

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    [Jan 13, 2013]
    Sorry bit late replying - but yes everything looks ok but he bluetooth antenna definitely not oem. Hopefully the sensitivity tweaks will cure....
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