The ESP32 LYRAT V4.3 board has poor sound quality. SNR only 26 dB

[chencang]

The ESP32 LYRAT V4.3 board has poor sound quality. I think linear interpolation is off.
I use the routine pipeline_sdcard_mp3_control that comes with ESP32 ADF. When I play 1KHZ on the ESP32 LYRAT V4.3 development board, the waveform is a little bad. The attachment is my test result.
We can see that the output at every 44K sampling rate is a fixed level. The signal-to-noise ratio is only 26 dB tested by RMAA software. I think the interpolation algorithm of ES8388 CODEC is closed.
I read ES8388's Handbook and it seems that there is no description of it. But in the SE register of Register 29-DAC Control 7, it is likely that the number of interpolations is set. Can you set SE to 111? Thank you very much to the staff of espressif.
Or maybe it's caused by other reasons, waiting for your solution. Thanks very much!!
--- - Chencang

[niujing]

Hi,

Thanks for your feedback, we double check the board, it seems there is some mistake of the speaker PA output, it has saturation distortion at the max volume, it cause the SNR fail, we will update the audio parameter soon to solve this issue.
Thank you

[chencang]

Have you solved this problem ? thank you！！

[famlee]

Hi, I am also interested whether this problem has been solved? Please give a small update. Thank you in advance.

[Dsalg2022]

Was this issue ever addressed?

Is the intent to limit the maximum volume out of the ES8388 to 70% as in the ESP-ADF examples?