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Now I have

  • A: Desktop PC with Arch Linux

  • B: Raspberry Pi 3 with Raspbian Buster connected with a speaker

and I'd like to use B as a wired speaker of A. By "wired", I mean that A and B are connected via a USB cable or an 3.5mm audio cable (but not via bluetooth).

Is it possible? I can find many explanations how to use a Raspberry Pi as a bluetooth speaker, but cannot find the wired version.

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    RPi have no audio input on 3.5mm but only audio output . – Ephemeral May 11 '20 at 16:15
  • I think it should be possible on a RPi Zero or RPi4 with OTG USB.. but why would you want to do it? you could get a much superior quality with a usb DAC which just works out of the box. The Sound Blaster Play!3 is very affordable. But maybe you should take a look at Topping and other competitors in the 100-150$ range. Cheers – Valentino Feb 8 at 21:04
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There is a g_audio driver which allows Linux systems with USB OTG support to show up as audio devices on the USB host.

You won't be able to do it on a Pi 3 though, you'll need a Pi 4 or a Zero which support OTG.

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As Emphemeral stated in his comment, the Raspi has no wired audio input natively except for using I2S with the IO pins. But if you want to use USB or a 3.5 mm audio jack, a sound card might be an option.

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