| Line-level |
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Information AboutLine-level |
| CATEGORIES ABOUT LINE LEVEL | |
| electronics | |
| audio engineering | |
| sound | |
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Line level is a term used to denote the strength of an audio signal used to transmit Analog sound information between audio components such as CD and DVD players, TV s, Amplifier s, and Mixing Console s. Depending on the application, line levels are stated in units of either Decibel volts (dBV) or decibel volts unloaded (dBu). Consumer audio equipment line levels are rated in dBV, and the most commonly used reference level for such equipment is −10 dBV, which corresponds to a signal of about 316 Millivolts RMS . Professional audio equipment line levels are rated in dBu, and the most commonly used reference level for such equipment is +4 dBu, which corresponds to a signal of about 1.228 volts RMS. Line level signals are often contrasted with weaker signals, such as those output from Microphone s and Instrument Pickups , and stronger signals, such as those used to drive Headphones and Loudspeaker s. LINE-LEVEL IN TRADITIONAL SIGNAL PATHS Acoustic sounds (such as Voice s or a Musical Instrument s) are often recorded with Transducer s ( Microphone s and Pickup s) that produce weak electrical signals. These signals must be amplified to line level where they are more easily manipulated by other devices (such as mixing consoles and tape recorders). Such amplification is performed by a device known as a Pre Amplifier . After manipulation at line level, signals are then typically sent to a device known as a power amplifier, where they are amplified to levels that can drive Headphone s or Loudspeaker s, which convert the signals back into sounds that can be heard through the air. Most Phonograph s also have a low output level and require a preamp; typically, a home stereo amplifier will have a special phonograph input with a built-in preamp, which also modifies the signal in order to account for the Attenuation used in phonography of low-frequency signals. REFERENCES # 1. EXTERNAL LINKS
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