What Is a Home Theater Receiver? | Central Hub Explained

A home theater receiver, also called an AV receiver or AVR, does the heavy lifting in any surround sound setup. It takes in audio and video signals from your sources—cable box, game console, streaming stick—then processes the sound, amplifies it for your speakers, and passes the picture along to your TV. Without one, your fancy speakers have nothing to listen to and your TV has no way to hear your devices’ premium audio formats. The good news: choosing and setting one up doesn’t need to feel overwhelming.

What Does an AV Receiver Actually Do?

An AV receiver is essentially three components in one box: an audio/video switcher, a surround-sound processor, and a multi-channel amplifier.

It handles four critical jobs in your system:

• Switches inputs so all your devices share one connection to your TV
• Decodes surround sound formats like Dolby Atmos and DTS:X
• Amplifies audio to power your speaker channels
• Routes video to your display, supporting 4K and 8K passthrough on newer models

Most current receivers also support HDMI switching with eARC/ARC, which lets your TV send audio back to the receiver from its own built-in apps—so your streaming TV’s sound can play through your proper speakers.

What to Look For When Choosing a Receiver

The right receiver for you depends on your room, your speakers, and your budget. The two numbers you’ll see most often are the channel count (like 5.2 or 9.4) and the HDMI spec. The first figure—channels—tells you how many speakers the unit can power, while the second number indicates how many subwoofer outputs it has. The Denon lineup offers a clear range of choices: the AVR-S670H is a solid 5.2-channel entry point at $649, while the AVR-X4800H steps up to 9.4 channels at $2,799 for larger, more demanding setups. For most living rooms, a 7.2-channel model strikes the best balance between performance and cost.

If you’re shopping with a tighter budget, plenty of capable receivers exist under $500 that still handle 4K video and basic surround formats. Our tested roundup of the best A/V receivers under $500 walks through the models worth your money. Whatever you pick, confirm the receiver supports the audio formats your speakers and TV use, and make sure it has enough HDMI inputs for your devices.

How to Set Up Your Home Theater Receiver

Setup follows a consistent pattern across brands. Start by connecting the receiver’s HDMI OUT eARC/ARC port to your TV’s HDMI IN eARC/ARC port with an HDMI cable. Then plug each source device into the receiver’s HDMI IN ports. On Sony receivers, the on-screen Easy Setup wizard then walks you through speaker configuration. For Dolby Atmos, you need to assign your surround back terminals to Height Speakers and set the Speaker Pattern to a matching x.x.2ch layout, such as 5.1.2.

If you’re using a Sony receiver with an eARC TV for Atmos passthrough, the steps are specific: enable eARC on the TV, enable Dolby Atmos and DTS:X output on the TV, then on the receiver select Audio Return Channel → eARC, set Input Mode to Auto, and choose HDMI OUT A. Sony also requires a Premium High Speed HDMI Cable with Ethernet for this workflow and notes the eARC cable should connect to either the TV or the soundbar input—not both. For larger, higher-end setups, a receiver like the Denon AVR-X6800H at $3,799 offers 11.4 channels to drive a truly immersive Atmos system. Below is a quick comparison of what you get at different Denon price points.

One caveat worth noting: eARC/ARC features must exist on both your TV and receiver for that return-audio workflow to work at all. When a feature relies on both ends supporting it, that’s where setup gets tricky—and it’s the most common reason Atmos doesn’t play. Sony’s eARC and Atmos setup guide explains these connections in detail, and Crutchfield’s receiver buyer’s guide is a solid reference for general setup. As long as your TV and receiver share the same audio capabilities, you’ll get the full surround experience without surprises.