![]() ![]() Professional equipment may also use unbalanced connections with (1/4 inch) TS phone jacks. Professional equipment commonly uses balanced connections on 6.35 mm (1/4 inch) TRS phone jacks or XLR connectors. The line in/out connections on consumer-oriented audio equipment are typically unbalanced, with a 3.5 mm (0.14 inch, but commonly called "eighth inch") 3-conductor TRS minijack connector providing ground, left channel, and right channel, or stereo RCA jacks. Line out provides an audio signal output and line in receives a signal input. ![]() The "strength" of these various signals does not necessarily refer to the output voltage of the source device it also depends on its output impedance and output power capability.Ĭonsumer electronic devices concerned with audio (for example sound cards) often have a connector labeled line in and/or line out. There are weaker signals such as those from microphones ( microphone level or mic level) and instrument pickups ( instrument level), and stronger signals, such as those used to drive headphones and loudspeakers ( speaker level). Line level sits between other levels of audio signals. ![]() Line level is the specified strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, television sets, audio amplifiers, and mixing consoles. ![]() For the tool of a similar name, see Spirit level. ![]()
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