Best answer: SPDIF stands for Sony/ Philips digital interface. It is not a standard for the actual RCA coax, Toslink , or other physical connecter, but for the signal format. The coaxial output on this, and other digital source devices would certainly output a SPDIF signal, but this isn't especially emphasized anymore, just like how transistor-based electronics don't make a big deal out of being "solid state". It used to be that 2-channel CD players were the only common digital sources, and the Toslink or RCA coax outputs were a higher-end feature to allow bypassing the CD player's internal digital/analog converters and having the SPDIF datastream passed to a better external DAC. As DVD's, Blu-Ray, Dolby 5.1, 7.1, DVD-Audio, DTS, SACD and other signal formats besides SPDIF came into use, the same RCA coax connections on the new format players handed the different signals off to receivers, and highlighting that the coax would transmit SPDIF signals (along with many other flavors of digital signal encoding...) fell out of use. Generally, the RCA coax will pass any digital audio signal that is encoded on a disc, except for the very newest Dolby True-HD and DTS-HD formats, which require HDMI's copy protection.
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