It is used as a tuner for AM/FM,satellite, orinternetradio.
It also functions as a multi-channel amplifier that processes and sendssound signalsand power to the speakers orsubwoofers.
Video from source components can also berouted through the receiver to a TV if desired.

Onkyo / D&M Holdings / Marantz
In addition, many home theater receivers serve as a multi-zone audio distribution system.
What Is a Multi-Zone Audio Receiver?
How Does Multi-Zone Work?
You don’t have to have both the main and second zone features running at the same time.
Many think that Zone 2 can only be used in another room, but that isn’t the case.
Some home theater receivers include both multi-zone and wireless multi-room audio features.
you’ve got the option to download most user manuals from the manufacturer’s website.