Output bit lower than source

[leptao]

I would just check the manual to see what bit depths and sample rates the S/PDIF (optical, coaxial) or USB inputs support and try one of those.

A good S/PDIF coaxial board for the Pi is Allo DigiOne https://www.allo.com/sparky/digione.html

Thank you, I will check for this coaxial board.

Please let me know if you know something more about my receiver.

Meanwhile I will post on the RPI forum a thread about the bit length.

Many thanks, Tim