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I have a Raspberry Pi 4 running Raspbian Lite Release 10. I will be running squeezelite on it for it to function as a squeezebox player. I need to have sound output to RCA jacks to plug into my stereo amplifier. I do not need RCA video. I am running the raspberry pi headless so I do not need video at all.

  1. Do I need to enable Composite in raspi-config A8 Raspberry Pi 4 video output options to get RCA audio from 3.5mm jack or is there a sound-only RCA output setting somewhere?

  2. Will I need to change any other settings to have RCA sound output?

  3. Can I use a TRS 3.5mm audio cable with just two (audio) RCA jacks at other end or do I need to use a TRRS 3.5mm audio jack with three RCA jacks. I am worried that using a TRS will short the ground and video contacts.

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1 No you don't need to enable composite on a Pi4 to get analogue/headphone audio.

2 Using 'sudo raspi-config', select 'System Options','Audio','Headphones'

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3 You can use a regular 3.5mm TRS audio cable. The Pi TRRS socket is designed to allow video to be shorted.

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  • Thanks @CoderMike. Is "headphone" output the same as output suitable for line inputs (RCA) to an amplifier? I thought that headphone output might be amplified and thus not suitable for line input and I thought that headphone output and line output are designed for different impedences.
    – brett stevens
    Commented Oct 19, 2021 at 19:14
  • The headphone output works fine for line inputs - that's what I use to an amplifier.
    – CoderMike
    Commented Oct 19, 2021 at 19:24

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