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I’ve been looking for a version of this with 2.1 for a passive subwoofer with bookshelf speakers. Everything I’ve seen is only two channels.

Unless maybe I set the sub as a second airplay or Bluetooth device and run one of these [1]? I’m not really sure how all of that works.

https://pimylifeup.com/raspberry-pi-airplay-receiver/

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2.1 systems generally use powered subs, not passive subs.

For use with higher-quality bookshelf speakers, you can send the stereo line level signal to a 2-channel amp and pass the high-level speaker lines through your sub. I do this with Belkin AirPlay 2 receivers and it works well.

Not all subs have high-level passthrough though.

I'm building my own subwoofer, so I'm assuming you mean the sub has a plate amplifier in the back? Like this:

https://www.daytonaudio.com/product/776/sa70-70w-subwoofer-p...

Yes, exactly. And that plate amp has the passthrough I mentioned, which not all plate amps do.

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