The Onkyo TX-RZ 900 is a high-end AV receiver known for its advanced features and excellent audio performance. It offers support for Dolby Atmos and DTS:X immersive audio formats, as well as 4K Ultra HD video pass-through with HDR and HDCP 2.2 support. The receiver also has built-in Wi-Fi, Bluetooth, and streaming services like Spotify and Pandora. It has a robust build quality and is designed for enthusiasts looking for a top-tier home theater experience.