Troubleshooting if the sound on the Mi Smart Projector changes dramatically, please refer to the following steps:
1. Make sure you haven't accidentally adjusted the volume level on the projector or the connected audio device;
2. Check that your audio source (e.g., streaming device, DVD player) is functioning correctly and that the issue isn't specific to a particular source;
3. Ensure all audio cables are securely connected to both the projector and the external audio device. Loose connections can cause fluctuations in sound quality;
4. Sometimes, a simple restart can resolve temporary issues. Turn off the projector, wait for a few seconds, and then turn it back on;
5. Consider updating the projector's firmware to the latest version. Firmware updates may include fixes for sound-related issues;
6. If the issue persists, you can try resetting the projector's audio settings to their default values. This can be done through the projector's settings menu;
7. Try playing audio from different sources to determine if the issue is specific to a particular source or format;
8. If none of the above steps resolve the issue, contact your local after-sales for further assistance regarding this issue.