An electronic device used for increasing the power of a signal.
Preamplifier An amplifier that prepares a small electrical signal for further amplification or processing
The amplifier that produces the "power" of the sound (also called power amp) Integrated amplifier Preamplifier + Main amplifier
Integrated amplifier + radio
AVR / AV-receiver
Multi channel receiver OR multi channel integrated amplifier - 5.1 - 7.1 etc. (AM/FM tuner it is not a primary or mandatory function as an AVR still remains an amplifier)
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