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Distortions in Pi 4 + Amp2 + Equalizer

Hi,

There are audible distortions whenever I increase any frequency band volume using command: alsamixer -D equal

Is it possible to fix that somehow?

I use Raspberry Pi OS Lite Buster. Here is my /home/pi/.asoundrc:

pcm.!default {
  type plug
  slave.pcm plugequal;
}
ctl.!default {
  type hw card 0
}
ctl.equal {
  type equal;
}
pcm.plugequal {
  type equal;
  slave.pcm "plughw:0,0";
}
pcm.equal {
  type plug;
  slave.pcm plugequal;
}

The output from aplay -l:

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

 

Thank you!

 

 

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