Headphone amplifiers with coaxial output
Coaxial S/P-DIF
— output for digital audio transmission via coaxial electrical cable. In terms of capabilities, it is similar to the optical output (see the relevant paragraph), it allows you to work with stereo and even multi-channel sound through one connector. At the same time, a coaxial cable, on the one hand, does not have one hundred percent protection against interference, on the other hand, it costs less than fiber optic and does not require special delicacy in handling.Note that specifically in headphone amplifiers, digital outputs (including coaxial) perform an auxiliary function: they are usually responsible for switching the digital signal coming to the corresponding input. So models with such outputs have not received much distribution, and it makes sense to specifically look for such an amplifier if you initially plan the appropriate application — for example, broadcasting music from a USB flash drive connected via USB OTG (see "Inputs") to a digital input of an external audio receiver.
It is also worth mentioning that the "native" hardware connector for the coaxial interface is RCA, but you should not confuse such an output with analogue RCA (see the relevant paragraph) — these are fundamentally different standards. And in some headphone amplifiers (especially portable ones), the coaxial S/P-DIF is combined with another connector (for example, built into a 3.5 mm mini-Jack), which requires the use of appropriate cables / adapters.
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