still wondering if it could be the cables i am using, one of them plays the 24/176 music sample from the AK PLAYERS and the other 2 dont all three dont play 192,I have a sysconcept cable coming this week hopefully that will solve the mystery.
Just a reminder to those people who are suffering with TOSLINK optical digital cables.
The cable quality (not price) makes a big difference, as well as the bend angle. (as much as the optical transmistter quality of the DAP).
The TOSLINK standard was originally only intended for up to 96kHz on the cheap single core plastic fibre cables, which is what most audio optical cables use, unlike the graded/multi-strand glass fibre on expensive data cables.
The older and cheaper TOSLINK cables have terrible tip roughness that also limits the max rate that it can safely feed. Even the expensive cables started having pop noises above 88.2kHz. Some of those I got to work at 192kHz by polishing the end cap, but not all were successful.
I can't recommend any particular brand of TOSLINK cable, and it's hard to tell because most of those cable makers don't make their own brand of cables anyway.
Attached are some photos I took many years ago FYI.