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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.
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.
In audio processing and sound reinforcement, an insert is an access point built into the mixing console, allowing the audio engineer to add external line-level devices into the signal flow between the microphone preamplifier and the mix bus.
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.
Loudness compensation, or simply loudness, is a setting found on some hi-fi equipment that increases the level of the high and low frequencies. [1] This is intended to be used while listening at low-volume levels, to compensate for the fact that as the loudness of audio decreases, the ear's lower sensitivity to extreme high and low frequencies ...
Similarly, in a constant-voltage speaker system, the amplifier uses a transformer to step up the voltage of the audio signal to reduce power loss over the speaker cable, allowing more power to be transmitted over a given wire diameter. Each speaker in the system has a step-down transformer to reduce the voltage to a usable level.