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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. Generally, line level signals sit in the middle of the hierarchy of signal levels in audio engineering.
Since the amplifier is at the same location as the speaker, the speaker requires only a line level audio signal as an input. Line level signals are typically around 1-2 volts, and can be transmitted over much smaller cable (typically 20-26 AWG).
A power amplifier is an electronic device that uses electrical power and circuitry to boost a line level signal and provides enough electrical power to drive a loudspeaker and produce sound. All loudspeakers, including headphones , require power amplification.
A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. The term usually refers to a type of radio-frequency (RF) power amplifier , some of which have output power measured in kilowatts , and are used in amateur radio .
A micro audio amplifier for boosting the output of line level sources to headphones or small speakers. Edge length 4 cm, weight 16 g, power output ca. 0.1 W into a 32 Ohm load. The final stage of amplification, after preamplifiers, is the output stage, where the highest demands are placed on the transistors or tubes.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input ...
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