AV receiver

An AV receiver sits at the center of most full home theater sound systems. It takes in audio and video from sources like a streaming box, game console or Blu-ray player, decodes surround formats such as Dolby Atmos or DTS:X, amplifies the signal to drive multiple speakers directly, and passes video through to the TV or projector over HDMI.

Key specs to compare include the number of amplified channels, which determines how many speakers it can power without an external amp, HDMI ports with enough bandwidth for 4K and HDR passthrough, and built-in room correction for tuning speaker levels and timing to the room. Wireless features like AirPlay or Bluetooth streaming are common but secondary to how it handles the core surround decoding.

A common mistake is buying a receiver with fewer channels than the planned speaker layout, only to discover height or surround-back speakers cannot be powered without an add-on amplifier. Another is ignoring HDMI bandwidth specs and finding that a new 4K120 source cannot pass through at full quality, which usually means checking the receiver's HDMI version before adding new gear.