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Thread: Car audio question - 2003 Audi A4 - how to power it?

  1. #21
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    Here is the reply from the maker of the SVEN4...

    Unfortunately it will not you will need some kind of boosting amplifier or run it into your vehicles headunit via AUX.

    So it does look like I will need an amp for the front stage, and connect the soundcard to an amp, then the amp to the LOC...
    ~Puff

    View my worklog... I dare you... http://www.mp3car.com/vbulletin/worklogs/77267-2003-audi-a4-worklog-puffs-ride.html

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  2. #22
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    I disagree. I say try it. If it doesnt work you can always purchase a line driver. Crutchfield has a great return policy

    It looks like the adpater has RCA inputs.

  3. #23
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    I've fixed the attachment in my previous post, sorry about that.

    As far as the SVEN4 adapter, I really don't think it is necessary. The factory amplifier in your car should be pretty simple to interface with. Besides the actual physical connections I would think that all of the audio and turn on signals are standard level - nothing crazy like the VW Monsoon system. Like I said just check the turn on signal with a multimeter. You could also check the audio signals with a small speaker too.

    Good Luck.

  4. #24
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    Would a good test be to buy the adapter, hook it up, and use an iPod to play some music through it? If an iPod sounds ok through it, then soundcard output sould be fine too, right? An iPod puts out about the same as a line out on a soundcard, yes?
    ~Puff

    View my worklog... I dare you... http://www.mp3car.com/vbulletin/showthread.php?t=77267

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  5. #25
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    Quote Originally Posted by Puffanug
    If an iPod sounds ok through it, then soundcard output sould be fine too, right?
    dmurray14 would disagree with you.
    But, like anything else with CarPCs: Your Mileage May Vary.
    For Sale: Carputer (CarPC) & RCA Y-Adapter
    Newsflash: Take a look at my unsold stuff above, thanks!
    Up Next: Make an OBD to Serial cable & Redo the "MMI buttons"

  6. #26
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    OK, I looked at the diagram that walky talky20 posted. It looks like all I need is an amp for the front and a signal processor of some kind provide two sets of RCA outputs to the amps. This seems very do able, and without the SVEN4. A few questions come to mind with this plan...

    What kind of signal processor? Is there one that will provide two sets of RCA outputs and connect to the computer via USB? Like a USB soundcard with two sets of RCA outs I guess.

    Could I get a DAC with one set of RCA outs and then split those with y-splitters and avoid the signal processor being seperate from the soundcard?

    What kind of amp? I know 2 channel if I don't use the front center speaker. How much of a difference would I hear without the center? I guess I could turn off the center with the factory HU and listen, lol...

    How many watts on the amp? Any brand recomendations? I can get good deals on Sony stuff via work, but I've seen some people **** on Sony car audio...

    I feel a solution is very near...
    ~Puff

    View my worklog... I dare you... http://www.mp3car.com/vbulletin/showthread.php?t=77267

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  7. #27
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    I don't think you'll need any kind of "signal processor". Just get 2 of these:

    Name:  mini-jack-rca.jpg
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    Connect one from the FRONT audio output of your computer to your new amplifier for the front stage.

    Take the second one and hack off the RCA jacks at the end and connect those wires to the corresponding pins on the factory amplifier plug, plug this into the REAR audio output of your computer.

    If your computer only has 1 output (as in Not multichannel) then you have 2 choices:
    1) Forget multichannel and just split the signal so the front and rear get the same signal.
    2) Buy a new soundcard that is multichannel - USB is a good choice.

  8. #28
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    Cool, that should work. I have not bought the soundcard yet, but it will be USB. I'll compare single channel vs. multi channel soundcards. I assume with a multi-channel card I would get better sound since i will not be splitting a signal.

    Here is a simplified diagram of the factory audio (based of the .pdf that walky talky20 posted, thanks!). I will be making another version of this showing how it will connect to the computer. Then I will add it to the main diagram for my system...

    ~Puff

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  9. #29
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    OK, here is the updated diagram showing the audio being routed the way walky talky20 suggested. Anyone see anything I am missing?

    I think i need a power distribution block somewhere (2 amps, 1 P1900 PSU). Anything else I may be missing?

    ~Puff

    View my worklog... I dare you... http://www.mp3car.com/vbulletin/showthread.php?t=77267

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  10. #30
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    Looking great! Ecellent diagram, everything looks good. Just a few things to note.

    I see you are using your car's ignition line for the amp turn-on for both amplifiers. You may need to somehow delay that to avoid "pops" when the computer is booting (for example it may "pop" when it powers up and initializes USB devices). You may not have this problem, just something to think about. I know that many of the DC-DC power supplies have a Remote Out for this very purpose, but I'm not sure about the P1900.

    Also, make sure and double check the factory amplifier pinouts. I showed you the diagram and gave my best guess for the wiring, but be sure and test it first to make sure that you can get the factory amp to power up and work for you (you can use an iPod). Like I said, I would recommend that you identify the wires while the factory head unit is in place. Find the audio input wires and see what kind of level they are (low-level or high-level). Find the turn-on wire and check it's voltage. Then if all is good, send it some audio from an iPod and send it a turn-on signal and make sure you are good to go.

    Peace.

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