Connectors

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 The XLR connector (also Cannon plug and Cannon connector) is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage power supply. XLR connectors are part of the international standard for dimensions, IEC 61076-2-103.[1] The XLR connector resembles the DIN connector, but is larger, more robust and physically incompatible. 

A phone connector is a family of cylindrically-shaped electrical connectors primarily for analog audio signals. Invented in the late 19th century for telephone switchboards, the phone connector remains in use for interfacing wired audio equipment, such as headphones, speakers, microphones, mixing consoles, and electronic musical instruments (e.g. electric guitars, keyboards, and effects units). A male connector (a plug), is mated into a female connector (a socket), though other terminology is used.

The RCA connector[3] is a type of electrical connector commonly used to carry audio and video signals. The name RCA derives from the company Radio Corporation of America, which introduced the design in the 1930s.[4] Typically, the output is a plug type connector and input a jack type connector. These are referred to as RCA plug and RCA jack respectively.

It is also called RCA phono connector[5] or phono connector.

A phone connector is a family of cylindrically-shaped electrical connectors primarily for analog audio signals. Invented in the late 19th century for telephone switchboards, the phone connector remains in use for interfacing wired audio equipment, such as headphones, speakers, microphones, mixing consoles

 Used in professional audio systems for connecting loudspeakers to amplifiers. These  connectors are rated for at least 30 A RMS continuous current,[4] higher than 1/4-inch TS phone connectors, two-pole twist lock, and XLR connectors for loudspeakers.