Disney+ evaluates the playback capabilities of connected audio devices and uses the highest quality audio that the system can support.
To enjoy the highest quality Disney+ experience, all components, including HDMI cables, should support high bandwidth digital content. External displays should support HDCP 2.2 for 4K Ultra HD and HDR content. Older audio and video components can have an impact on quality or may not work at all.
Consult with the device manufacturer for capabilities of your specific device(s).