I already discussed this issue in Tutorial: Connect Mini/Pro to other I2S DACs - #35 by zpl1025, but we found no solution. Now I want to ask a wider audience:
I have connected the I2S output of a Up2Stream to a ADAU1701 DSP. If I stream audio over the WiFi or Ethernet, only the right channel creates heavy distortion. This issue doesn’t appear if I stream audio over bluetooth, USB or analog input. If I switch the LRCLK the distortion comes only from the left channel.
Also the automatic voice, which tells me that the WiFi connection is connected, is distorted. I think it’s related to the Linkplay board. I tried another Up2Stream but get the same result.