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The right channel is louder than the left.

Zush

April 20, 2023 14:31

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I am using DAC2 HD and DSP on Raspberry Pi 4 with the latest version of HiFiBerry (20230404).

I noticed that according to the volume indicator on the amplifier, the left channel plays about 3-5 times quieter. I have to adjust the balance towards the left channel by 80-90% to achieve the correct stereo.

Also, the sound from the left channel sounds worse, more muffled, as if it lacks high frequencies.

It's definitely not the fault of the amplifier - other sound sources sound correctly on it.

What I've tried (nothing helped):

• Changed the cable
• Removed DSP
• Reconnected the DAC2 board
• Tried other amplifier inputs
• Checked sound balance settings in HiFiBerryOS
• Checked DAC board for any visible defects

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5 comments

• 0
  
  HiFiBerry team April 20, 2023 14:40

  Please login via SSH and post the output of 
  
  amixer

• 0
  
  Zush April 20, 2023 14:43

  # amixer 
  Simple mixer control 'DSPVolume',0
    Capabilities: volume
    Playback channels: Front Left - Front Right
    Capture channels: Front Left - Front Right
    Limits: 0 - 255
    Front Left: 255 [100%]
    Front Right: 255 [100%]
  Simple mixer control 'DAC',0
    Capabilities: pvolume
    Playback channels: Front Left - Front Right
    Limits: Playback 0 - 240
    Mono:
    Front Left: Playback 204 [85%] [-18.00dB]
    Front Right: Playback 204 [85%] [-18.00dB]
  Simple mixer control 'DAC Invert Output',0
    Capabilities: pswitch pswitch-joined
    Playback channels: Mono
    Mono: Playback [off]
  Simple mixer control 'DAC Rolloff Filter',0
    Capabilities: pswitch pswitch-joined
    Playback channels: Mono
    Mono: Playback [off]
  Simple mixer control 'Softvol',0
    Capabilities: volume
    Playback channels: Front Left - Front Right
    Capture channels: Front Left - Front Right
    Limits: 0 - 255
    Front Left: 255 [100%]
    Front Right: 255 [100%]

• 0
  
  Zush May 27, 2023 18:37

  Wow, I replaced the main Raspberry Pi board and it helped. Now both channels play equally.

• 0
  
  Zush June 04, 2023 18:49

  The problem started appearing on the new Raspberry Pi board as well. I realized that it wasn't the board replacement that helped, but rather disconnecting the HiFiBerry from the power source. When I turn it off, wait for 10-15 minutes, and turn it back on, both channels play equally. However, over time, the bias starts to accumulate. After about half an hour the right channel becomes noticeably louder. After a few hours, the left channel is practically inaudible. What could be the problem? I thought it might be overheating, but I'm using an open case, and the temperature stays below 60 degrees.

  # cat /sys/class/thermal/thermal_zone0/temp
  58913

   

• 0
  
  HiFiBerry team June 05, 2023 05:43

  Did you check the mixer settings? We have seen some programs just changing the volume of one channel, not both. Have a look at the output of "amixer".