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A 9-channel AV receiver is a type of audio/video receiver that is designed to power a 9.1 or 9.2 surround sound speaker system. This type of receiver has nine discrete channels of amplification, typically rated between 50-150 watts per channel, and is capable of decoding and processing various surround sound formats, such as Dolby Atmos, DTS:X, and Auro-3D.

The "9" in 9-channel refers to the number of speakers in the system. A 9.1 or 9.2 speaker system consists of nine speakers: a center channel speaker, two front speakers, two surround speakers, two height speakers, and either two rear surround speakers ( in a 9.2 system ) or one pair of rear height speakers ( in a 9.1 system ), as well as a subwoofer for low-frequency effects. The receiver sends the audio signals to each speaker individually, creating an even more immersive and detailed surround sound experience.

In addition to the nine channels of amplification, 9-channel AV receivers typically include multiple input and output ports, such as HDMI, optical, and analog, to accommodate various audio and video sources, as well as built-in audio and video processing features, such as equalization, video upscaling, and support for advanced audio codecs.

When choosing a 9-channel AV receiver, it is important to consider factors such as power output, input and output ports, compatibility with your speaker system and devices, and features such as wireless connectivity, integration with smart home systems, and support for advanced audio and video formats.