Coaxial SPDIF Cable Vs. RCA Cable

Techwalla may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.
RCA cables get their name from the RCA corporation, which developed them.

In the world of consumer electronics, different types of cables and connections are used to transmit audio between components, with varying levels of quality. One such type is the analog composite RCA cable connection, and another is the digital S/PDIF-standard coaxial audio.



S/PDIF, short for Sony/Philips Digital Interconnect Format, is a digital audio format used to connect digital components, such as a Blu-Ray/DVD player, cable/satellite set-top receiver box or HDTV, to a surround-sound stereo receiver. This is a 16-bit protocol for relaying Dolby Digital and DTS multi-channel sound and is more commonly associated with optical (TOSLINK) audio cables but can also apply to coaxial audio cables.


Video of the Day

RCA Cables

Composite RCA is an analog stereo audio connection with two separate cables to carry the right and left stereo channels. It has been used for audio components from phonographs to cassette players to CD players and for the audio connection for video components, such as VCRs and DVD players. RCA cables are also used for the audio portion of component video/audio cables.



Though coaxial audio cables resemble RCA cables in the shape and size of their connectors and can be interchangeable because they both have 75 ohm impedance and similar bandwidths, coaxial cables are thicker and have the same shielding as coaxial video cables to minimize interference. Because coaxial cables relay digital signals, they can carry 5.1 channel audio within the single cable, something the analog RCA cables cannot match.





Report an Issue

screenshot of the current page

Screenshot loading...