Unfortunately, I only see the QuickStart guide in Korean, and the user manual in Spanish. Even with a little translation, it's difficult to know which cable is necessary. I didn't see a separate part available online at Samsungparts.com either.
What sort of connector is on the Optical input on Samsung HT-DS400 Amp / Home Theatre ? This is an older model.
I know it isn't standard TOSLINK, because I tried that. The TOSLINK cable physically doesn't fit. I also tried carving a bit of plastic away from one end of the TOSLINK cable and that didn't help. The Samsung user manual for the HT-DS400 is coy about the nature of the port, simply calling it an optical port.
Thanks for reading this, even if you don't know the answer!
My subsidiary question is, if I am able to get the right optical cable, will it work with my WD TV box, which has a TOSLINK output? In particular to get sound from .mkv files. I think the acronym is something like DTS.