As I investigate cables to go with the plethora of new dacs and converters and headphone amps I'm acquiring the Coax plug has been confusing. It appears that the coax hook up is typically a decent shielded RCA ended cable for a so-called balanced hook up? Instead of 3 conductors, L+, R+, and ground -, only two are provided, carrying the L+ and the R+. So technically, any RCA cable can be used for a coax hook-up, but the poorly shielded cheap ones may cause a problem. Now I can see all 3 connectors on a 3.5mm plug, but this 2 conductor versus 3 is??? What about a Coax to a 3.5mm sound card jack? 2 connectors to a 3 connector jack?? Do I have that right, or do I need to put a piece of Duct tape over the coax jacks and just not go there?