S/PDIF (Sony/Philips Digital Interface) is a type of digital audio transmitted over 75 Ohm coaxial cable terminated with RCA connectors. S/PDIF can carry two channels of uncompressed PCM audio or compressed 5.1/7.1 surround sound but cannot support lossless formats that require greater bandwidth. For maximum performance, Tributaries digital audio cables are built to maintain consistent 75 Ohm impedance for accurate signal transfer of the digital data. Silver plating of the conductor will support higher frequency performance. Shielding is chosen for its immunity to noise and electromagnetic interference. Tributaries digital audio coaxial cables are sold in each.

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