What is the difference between a stereo receiver and an AV receiver? 

A stereo receiver and an AV receiver are two types of audio/video receivers that serve different purposes. While they share some similarities, there are also key differences between the two.

A stereo receiver is a two-channel audio AV amplifier with an integrated radio tuner. It is designed primarily for listening to music in stereo format. A stereo receiver typically includes inputs for various audio sources, such as CD players, turntables, and digital audio players, and it may also include features like tone controls and a headphone jack. However, it typically does not include any video processing or surround sound capabilities.

An AV receiver, on the other hand, is a more complex device that is designed to handle both audio and video signals. An AV surround sound receiver typically includes multiple channels of amplification, as well as video processing capabilities and support for surround sound formats like Dolby Digital and DTS. It may also include additional features like networking capabilities, built-in streaming services, and support for high-resolution audio formats.

One of the key differences between a stereo receiver and an AV home theater receiver is the number of channels of amplification. While a stereo receiver typically has only two channels, an AV receiver may have anywhere from five to eleven channels, depending on the specific model. This allows an AV receiver to provide surround sound processing and support for multiple speaker configurations.

Another key difference is the level of video processing capability. While a stereo receiver typically does not include any video processing capabilities, an AV receiver may include upscaling, conversion, and other video processing features to improve the quality of video signals.

In terms of connectivity, both stereo and AV receivers typically include a range of inputs and outputs for various audio and video sources. However, an AV receiver may include additional connectivity options, such as Ethernet, Wi-Fi, and Bluetooth, to support networked audio and streaming services.

Finally, it is worth noting that AV receivers are typically more complex and sophisticated than stereo receivers, and as a result, they tend to be more expensive. While a basic stereo receiver can be purchased for a relatively low price, a high-end AV receiver with advanced features can be quite expensive.

In conclusion, the main difference between a stereo receiver and an AV receiver is their respective capabilities. While a stereo receiver is designed primarily for music playback in stereo format, an AV receiver is a more complex device that can handle both audio and video signals, including support for surround sound processing and advanced video processing features.