Digi+ pro only feed noise

Hi. I’m new to digital audio. I brought a digi+ pro hat, to stream from Rpi3B+ through toslink to my active speakers, with build-in DAC (AVI ADM 9.1t). But the only sound I get noise, cracks and pops. I have tried with both HifiberryOS and Volumio, and primarily tested with Airplay, but result is the same with bluetooth.
In the speakers manual says, the optical S/PDIF is specified for stereo data 24 bit 96 kHz. As I understand this is a limit, and not a must (maybe I’m wrong), and Airplay steams at 16 bit 44.1 kHz.
The optical inputs work through other sound sources.

My (modest) question is, what could be wrong?


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