Headphone amplifiers with coaxial input
Coaxial S/P-DIF
— input for digital audio signal transmitted via S/P-DIF coaxial electrical cable. Most often it uses an RCA connector, but do not confuse the coaxial interface with the RCA input (see the relevant paragraph) — these are fundamentally different standards (besides, conventional RCA cables are poorly suited for digital connection, a special shielded wire is desirable for the latter). There are other design options — for example, in some models, a mini-Jack jack is responsible for this input, capable of switching to S / P-DIF mode.Anyway, the presence of this input means that the amplifier is equipped with a built-in digital-to-analogue converter and can work with a digital audio signal. The interface itself allows you to transmit two-channel and even multi-channel sound over a single cable. In this regard, it is similar to the optical input (see the relevant paragraph); in fact, "optics" is also one of the varieties of S / P-DIF. The main differences are that electrical cable (even shielded) is more prone to interference, but does not require as delicate handling as optical fiber.
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