digital cables

Coaxial Digital Audio Cables
Digital audio cables (or, as they're often called, SPDIF cables) provide a handy way to route multi-channel audio from one device to another with minimal to no signal loss. The specs for a coaxial digital audio cable are the same as for a typical video cable: 75 ohm impedance, coaxial construction. A good impedance match, and wide bandwidth, help keep the digital square-wave signal from rounding off to a point where data loss occurs, so impedance consistency and wide bandwidth are important here, just as in video cabling.

RCA / RCA

BNC to RCA

AES-EBU

USB