bobbydd OP
DAC connection: which type gives highest fidelity?
The very best was/is?
If you have the optical AT&T bnc type high speed optical glass fibre connector’s that Wadia and ML’s some used in their top models, these are the best, and you use them with a dab on the ends of the expensive "optical indexing fluid" that gives them an air free mating connection. The glass fibre lead is very fragile and can't be bent too much as the glass fibre cracks.
Cheers George