[ar-sa]

A power amplifier is an electronic device that increases the power of a signal. Its main function is to take a low-power signal and boost it to a level that can drive a load, such as a speaker. It does not have a built-in radio tuner, volume control, or input switching capabilities.

A receiver, on the other hand, is a more comprehensive audio component that typically includes a preamplifier, a power amplifier, and a built-in radio tuner. It also has various input switching options, such as Bluetooth, USB, or Auxiliary, and provides volume control. The preamplifier in a receiver processes the input signal before it is amplified by the power amplifier.