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a3 sound help

Discussion in 'In-Car Entertainment' started by zeeeebo, Aug 4, 2009.

  1. zeeeebo
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    zeeeebo Lifes one big laugh

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    [Aug 4, 2009]
    ok so i have wired up the sub in my car but have noticed the back speakers and rear audi sub are conected together on a audio cable which is taking up my suboutput at the moment. into this audio cable there are 3 coloured blocks a blue yellow and green running into an iec block with the output of an audio cable, but as far as i can see the blue and green blocks arent actually being used??

    any help would be awsome=)
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  3. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Aug 4, 2009]
    The yellow is the front & rear preouts
    The blue is the CD changer bus (if fitted)
    The green is CANBUS which is unused on pre 99 A3's
    Unfortunately the rear pre-out is used for both the tupperware sub and the rear speakers. They all run off the puny amp inside the tupperware box. The stock HU has no rear amp inside so if you want to run a proper sub off the rear pre-outs you need either a 4ch amp (2ch's for the rears and one bridged for the new sub) or you need to keep the stock amp in the circuit. You can buy the BLAU RCA adapter which replaces the yellow section of the multicoloured plug. You can the run proper RCA's & remote on to the boot, however without a 4ch amp you will then lose the rears.
    Easiest solution is to just unplug the red sub connector and pick up all the feeds you need from that plug (saves running all new cables), I can supply an adapter loom which plugs into the Red block without needing to cut any wires.
    But you still have the issue of the rears. The other option is to leave the rear amp plugged in and use piggyback's to tap the 4 wires you need for the new sub amp. The pin out looks like this below, and you only need left, right, screen and remote on. If you go this route I would disconnect the tupperware sub speaker as it will interfere with the sound, but ensure you tape off the wires as they will be live.
    [​IMG]
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  4. zeeeebo
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    zeeeebo Lifes one big laugh

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    [Aug 4, 2009]
    this has to be one of the most helpful feedback i have ever had! i will have a look when i get back from work! i think i may just split the rear audio cable so it does both!
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  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Aug 4, 2009]
    No probblem. Yes that's probably the easiest option. Good Luck, let me know if you need any further help.
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