The Onkyo TX-NR646 is a versatile 7.2-channel network AV receiver designed to deliver immersive sound for home theater systems. It supports a variety of audio formats including Dolby Atmos and DTS:X, allowing for a three-dimensional sound experience that enhances movie watching and gaming. The receiver is equipped with multiple HDMI inputs, enabling users to connect various devices such as game consoles, Blu-ray players, and streaming devices. It also supports 4K Ultra HD pass-through, making it suitable for modern video sources. Additional features include built-in Wi-Fi and Bluetooth connectivity, allowing for easy streaming from mobile devices and the internet. The Onkyo TX-NR646 is compatible with numerous streaming services and offers support for high-resolution audio formats. It comes with AccuEQ which is an automatic room calibration technology that ensures optimal sound according to the room's acoustics. The design includes a user-friendly interface, making it easy to navigate settings and options, and it also features multiple zone functionalities that allow for multi-room audio control.