The Onkyo TX-NR818 is a versatile 7.2-channel A/V receiver that supports a wide range of home theater formats and features. It provides a powerful surround sound experience with a total power output of 135 watts per channel at 8 ohms, ensuring clear sound across multiple channels. The device supports Dolby Atmos and DTS:X for immersive audio, making it suitable for modern home cinema setups. For video processing, the TX-NR818 is equipped with 4K upscaling and provides support for HDMI 2.0 and HDCP 2.2, allowing for high-quality video transmission from compatible devices. Additionally, the receiver includes features such as Wi-Fi, Bluetooth, and Zone 2/Zone 3 capabilities, enabling multi-room audio setups and streaming from various online services. The user interface is enhanced by the Onkyo's firmware updates, which improve functionality and user experience over time. The Audyssey MultEQ XT calibration system helps optimize speaker placement and calibration for the best listening experience based on the room's acoustics. Connectivity options include multiple HDMI inputs and outputs, as well as legacy connections like component and composite video inputs, ensuring compatibility with a wide range of devices. The Onkyo TX-NR818 also provides an intuitive remote control and app support for easy navigation and control of settings, making it user-friendly for both casual and experienced users.