ADAU1401 vs STM32 TDM sound distortion on max volume

Hi everyone

I'm working on a project with ADAU1401 connected to STM32F746 via TDM. The STM32 playing WAV or MP3 files from SD card and routing them to different TDM channels.

If I'm playing files on 100% volume the sound is bad, like it's above the volume threshold there is a lot of distortion. If I'm setting the volume to 70% most frequencies are playing good, but there are still some frequencies with distortion, so I need to put 40% of volume to make all the frequencies sound good.

I've tried same setup with Teensy 4.0 playing the files via TDM with the same ADAU1401 and same SigmaDSP project running on the ADAU, and it's the same volume problem, so I assume it may be the SigmaDSP project problem...

In the attached pictures is my SigmaDSP project, maybe someone could point me to any mistake in it

Best regards,

Roman Shteringarts.

Audio Signal Processors

adau1401

SigmaDSP Audio Processors

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