For Nebula projector with Android-operating system, if you feel the sound from your projector's built-in speaker is poor, try the following steps:

1. Try playing different videos in multiple installed streaming apps;
2. Update your projector to the latest firmware by going to Settings > Upgrade > Check Update;
3. Reset your Nebula by selecting Settings > (General) > About > Recovery and try the built-in speaker again.

If you are still encountering the issue, contact us and provide the following information so we can help you find a solution faster:

1. Your projector's current firmware version. You can check this by going to Settings > (General) > About > System Version;
2. A short video showing the sound issue.