A receiver does just that: it receives audio signals from different devices. Your receiver then processes the audio signal, cleaning it up as it does so, then amplifies it to provide your external speakers with clear, crisp sound. Most modern receivers also help to enhance video signals as well.

What is a receiver for speakers?

A receiver is an amplifier that has a radio section built in. The radio is selected like any other input on the amp but no other connection is needed other than a pair of speakers. If you have a home cinema amplifier with a radio in its an AV Receiver.

What is the difference between a receiver and a tuner?

A tuner is generally a radio tuner you hook to an existing pre-amp (switching amp) or integrated amp (pre-amp/power amp combo). A receiver generally refers to a combination power amp/pre-amp/tuner that can accept inputs from other components such as tape decks or cd players.

How does a receiver amplify weak signal?

To increase the power of the recovered signal, an amplifier circuit uses electric power from batteries or the wall plug to increase the amplitude (voltage or current) of the signal. In most modern receivers, the electronic components which do the actual amplifying are transistors.