Additional information covers how to connect source components like a gaming console and how to set speaker levels.
Unpack the home theater receiver and take note of what it comes with.
This can include:
Read the user manual before going further.

Home Theater Receiver Ethernet/Antennas - WiFi, Bluetooth, AM/FM.Images provided by Onkyo
Missing a crucial step can cause problems later.
Find a spot for your receiver.
Label cables and wires.

Speaker Connections and Setup Diagram.Images via Yamaha and Harman Kardon
Label both ends of the speaker wire and cables so that the connection route is easily identified.
The most efficient way to create labels is with a label printer.
Before labeling the cables, verify they are the optimum length.

Onkyo USA
Connect your speakers by matching the speaker terminals on the receiver to the speakers.
you could use any durable RCA audio cable to make this connection.
Connect to a TV.

Onkyo / Integra
Home theater receivers are now equipped with HDMI connections.
Once initial connections are completed, slide the receiver into position and plug it into AC power.
Turn on the receiver using the front panel power button and see if the status display lights up.
If it does, you could proceed with the rest of the setup.
Most receivers have a user interface that appears on the TV screen.
Many home theater receivers made since 2013 have eliminated analog video connections (composite and component).
How to Set the Speaker Levels
Most home theater receivers provide two options for setting speaker levels.
The first is to use the built-in test tone generator to manually balance the speaker level of each channel.
A sound meter provides numericaldecibel readingsthat you’ve got the option to write down for reference.
Another option is the use the automatic setup function.
Receivers come with a microphone if this feature is supported.
A common issue is that thecenter channel may be too soft.
Automatic speaker setup/room correction systems go by different names depending on the brand and model.
For example, it’s called AccuEQ if you have an Onkyo receiver setup.