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Thread: Laptop Audio To Factory Amp Audi J525 (TT MK2)

  1. #1
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    Laptop Audio To Factory Amp Audi J525 (TT MK2)

    Hi Guys,

    How would you connect a laptop audio card in this configuration:

    I want to use the factory amp of my Audi TT MK2 (Audi J525 5 channel amp) without the head unit ( Concert II with 9 speakers)

    I cannot use RCA cables as the J525 unit connector is Audi proprietary stuff. I'll have to hack the input wires and solder the cables coming out of the laptop audio on them. I just don't know how to split the sound on the four inputs, may be 1/8 to 4 rca cables and then cut the rca cables and solder to the j525 inputs wires !!!!!


    Sound System (Mine is the standard system):




    Digital Sound Package control unit -J525, standard (UDS)
    38-pin connector

    01 - Earth (terminal 31)
    02 - Battery + (terminal 30)
    03 - Vacant
    04 - Bass speaker front right -R23 and treble speaker front right -R22 (+)
    05 - Bass speaker front left -R21 and treble speaker front left -R20 (+)
    06 - Vacant
    07 - Mid-range/bass speaker rear right -R160 and treble speaker rear right -R16 (-)
    08 - Mid-range/bass speaker rear left -R159 and treble speaker rear left -R14 (+)
    09 - Vacant
    10 - Centre mid-range/treble speaker -R158 (-)
    11 - Vacant
    12 - Vacant
    13 - Vacant
    14 - Vacant
    15 - Vacant
    16 - Bass speaker front right -R23 and treble speaker front right -R22 (-)
    17 - Bass speaker front left -R21 and treble speaker front left -R20 (-)
    18 - Vacant
    19 - Mid-range/bass speaker rear right -R160 and treble speaker rear right -R16 (+)
    20 - Mid-range/bass speaker rear left -R159 and treble speaker rear left -R14 (-)
    21 - Vacant
    22 - Centre mid-range/treble speaker -R158 (+)
    23 - CAN wire Low
    24 - Vacant
    25 - Vacant
    26 - Vacant
    27 - Audio input rear left (-) *)
    28 - Audio input rear right (-) *)
    29 - Audio input front left (-) *)
    30 - Audio input front right (-) *)
    31 - CAN wire High
    32 - Vacant
    33 - Vacant
    34 - Switching wire of radio -R
    35 - Audio input rear left (+)
    36 - Audio input rear right (+)
    37 - Audio input front left (+)
    38 - Audio input front right (+)

    *) One earth wire from the radio for the 4 audio inputs of the amplifier

  2. #2
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    Well after some research I found out that the inputs on the J525 unit are coming from the Concert head Unit. this head unit outputs 4x20 Watt.
    The speakers are powered by the J525 which is sitting in the left side of the trunk, behind the left rear wheel.
    I think I need some sort of amp between the laptop audio output and the J525 unit. any ideas?

    Additional info: the output from the Concert Head Unit is Low Level !!

    Thanks

  3. #3
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    you might be able to search for 4 channel 'motorcycle' amps.. these are usually smaller, adn might work to power the factory amp. but if the cost rises abouve $200, it would be better to go over to a aftermarket amp.

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    I'm not sure wether this J525 is an amp or a crossover. Audi says it a controle module. My problem is not in piowering it up as I can tab into the pin 34 for switched power. the problem is will it accept input from my laptop sound card without the head unit connected. I'll try this weekend: remove the head unit, tab into the oem wiring without cutting it and see if there will be any sound out of the speakers.

    I think the OEM wiring is HU (low level) => J525 => Speakers (speakers powered by the J525 amp)

    My Install = laptop (low level I think) => J525 input pins (unit powered without head unit => Speakers (still powered by the J525 amp.

  5. #5
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    How would I go from the laptop audio 1.8 jack to the 4 inputs on the J525 unit:

    27 - Audio input rear left (-) *)
    28 - Audio input rear right (-) *)
    29 - Audio input front left (-) *)
    30 - Audio input front right (-) *)

    35 - Audio input rear left (+)
    36 - Audio input rear right (+)
    37 - Audio input front left (+)
    38 - Audio input front right (+)

    Any splitters out there ???

  6. #6
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    Any recommendations on an aftermarket amp (a small one) that will handle the standard 9 speakers system:


  7. #7
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    Guys I need your help here: Is it possible to use a switched line that's already in use by another electonic unit in the car ???
    Thank you.

  8. #8
    MySQL Error soundman98's Avatar
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    i am not aware of any 9 channel amps, you might need to use one 4 channel, and one 5 channel amp to get all the speakers to work-- which would be way more than $200---it would be way easier to go with the small amp, into the factory wiring before the factory amp, assuming that it needs speaker level inputs.

    you could try to hook the laptop directly up to the factory wire before the factory amp-- if it is speaker level, the audio will just be very quiet...

    if it is available, i ususally try to use a switched wire behind the radio(although CAN-BUS, and other computerized control systems might need a computer adapter )

    according to your first post, the amp uses pin 34, i beleive to tell if the radio is on, this should work, though you will need to check it with a volt meter before trying it. your car aso uses CAN-BUS, so it might also use that to turn on(it is hard to know)...

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    thank you for your help Soundman.
    In fact I managed to get good sound through the J525 Unit.
    I connected my laptop audio to one of the J525 input lins andkept it connected to the HeadUnit. I disconnected the headunit connector which goes into the j525 4 input lines. The J525 was then still powered by the HeadUnit trought another connector. the sound was good enough. I'm sure with some small amp before the amp would be helpful but right now I'm sticking with the factory stuff.
    Next step is to completely disconnect the HeadUnit and power the J525 from battery and a switched line and see if I still get sound. My fear is the J525 unit needs the headunit to function like alpine stuff. I hope it won't be the case.
    my previous question was not about 9 channels. What I wanted to know, I did some reading anyway, is how to go from my laptop to the 4 inputs of the amp. I only have 4 inputs. The J525 takes care of the 5 channel since it's a 5 channel amp according to the unit specs.

    With four inputs (and a fifth taken care of by the amp) my setup should be like this one :



    Let me know if it's not correct.

  10. #10
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    I figured out the audio wiring ftom the carpc soundcard to the audi J525 unit:

    I won't be using any RCA cables. Just a stereo 3.5mm jack and splitting the let and right channels into 4 cables (2 left and 2 right) then wiring the ground from the jack to the 4 gound pins. Accoring to Audi the four ground inputs can take common ground.



    Comments or corrections are welcome

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