Coaxial vs optical vs HDMI: which is the best audio connection to use? Connect over RCA If your TV and/or, more likely, your choice of speaker does not have an HDMI connection, they may well have ...

A plug and socket for coaxial cable. RCA connectors are used for analog audio signals (see analog audio). They are also used for digital audio (see S/PDIF) and analog video (see composite video).