Amplifiers with optical input
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— the presence in the design of the amplifier input for transmitting a digital audio signal via optical fibre (TOSLINK cable). This is a variant of the S/PDIF standard, and its capabilities are similar to the coaxial version (see above): it supports multi-channel audio over a single cable. The advantage of the optical interface is complete insensitivity to electromagnetic interference; the disadvantage is the fragility of the cable, some restrictions on its length and a rather high cost.