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trying to get quality audio from ORANGE PI 3 LTS line out

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the jack audio on my Orange Pi 3 LTS is very noisy... my setup description below


anyone having the same issue and fixed it? 


or anyone that went with a USB audio adapter or a HDMI adapter?


thanks for sharing



this is my setup
ORANGE PI 3 LTS headless

Linux 6.1.53-current-sunxi64 #1 SMP Wed Sep 13 07:43:05 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.3 LTS
Release:        22.04
Codename:       jammy


I'm using alsa and everything plays fine when using bluetooth

**** List of PLAYBACK Hardware Devices ****
card 0: ac200audio [ac200-audio], device 0: 508f000.i2s-ac200-dai ac200-dai-0 [508f000.i2s-ac200-dai ac200-dai-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sun9ihdmi [sun9i-hdmi], device 0: SUN9I-HDMI PCM i2s-hifi-0 [SUN9I-HDMI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


Using alsamixer I muted all the inputs and the input boost for card 0


further details from mplayer output...

mplayer -ao alsa someSong.mp3
MPlayer 1.4 (Debian), built with gcc-11 (C) 2000-2019 MPlayer Team
Playing someSong.mp3.
libavformat version 58.76.100 (external)
Audio only file format detected.
Clip info:
Opening audio decoder: [mpg123] MPEG 1.0/2.0/2.5 layers I, II, III
AUDIO: 44100 Hz, 2 ch, s16le, 192.0 kbit/13.61% (ratio: 24000->176400)
Selected audio codec: [mpg123] afm: mpg123 (MPEG 1.0/2.0/2.5 layers I, II, III)
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...


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I know this is the same on other Rockchip devices. Not sure what the cause is. Might be interference.
I use usb audio adapter or hdmi-audio on all my boards. Never the on-board audio jack because it was a problem long ago with other boards. Even RPi used to have terrible sound on audio jack if I remember well.

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