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Thread: Line-level sound card output to amplifier

  1. #1
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    Line-level sound card output to amplifier

    Hey everyone

    I read the thread on how to connect your computer's audio to your exisitng HU/amp, but I didn't see this issue addressed:

    Is the output from the sound card "line-level/pre-amp"? I.e. do I need to use a speaker-level -> line-level converter before running the sound card output to my amp's input? I have a feeling that it is not a low-line level output, but I didn't see that issue addressed in that thread.

    Thanks for the info!

  2. #2
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    the audio off a pc's sound card is low level. So you simply just run a 3.5mm to dual RCA type adapter, then run regular RCA type patch cables to your audio amp.

  3. #3
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    Quote Originally Posted by rgarjr View Post
    the audio off a pc's sound card is low level. So you simply just run a 3.5mm to dual RCA type adapter, then run regular RCA type patch cables to your audio amp.
    Perfect, thank you. for some reason, I was thinking that it wasn't a low level output, but then again, computer speakers generally have a separate amp.

    Any idea what the voltage is coming out of the sound card? I don't know if the even spec that kind of thing... I guess I'll have to check w/ the mobo documentation...

  4. #4
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    Quote Originally Posted by Rocket3004 View Post
    Any idea what the voltage is coming out of the sound card? I don't know if the even spec that kind of thing... I guess I'll have to check w/ the mobo documentation...
    the output voltage is probably different for each mobo/soundcard. you can measure it with a multimeter set to AC volts.

    the output will vary depending on volume and tone level. you'll need to use a test-tone to give a constant output, then with volume up all the way; measure either channel's positive to ground (audio ground, not chassis ground).

    NOTE: this will be much easier to do from the RCA adapter outputs.

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