The H1 chipset used in the AirPods Max is a proprietary chip developed by Apple. It is responsible for many of the key features of the headphones, including their excellent noise-canceling capabilities and seamless integration with Apple devices. The H1 chip also allows for easy switching between devices and quick pairing with compatible Apple products. Additionally, it enables the "Hey Siri" feature, which allows users to control their headphones using voice commands. Overall, the H1 chipset is an essential component of the AirPods Max, helping to provide a smooth and intuitive user experience.