Troubleshooting if there is an echo while you are watching the Mi Smart Projector, please refer to the following steps:
1. Look at where your projector is placed because big empty rooms or places with hard walls can cause sound to echo. Put soft things like pillows or curtains to absorb the sound;
2. Make sure the volume isn't too high. Loud sounds can bounce off walls and make echoes;
3. Check where you put any extra speakers. If they're too close to walls, they might make echoes. Move them away from walls if you can;
4. Try changing the sound settings. Some projectors let you delay the sound so it matches the video and stops echoes;
5. Use headphones to listen to the sound. This can stop echoes because the sound goes straight to your ears;
6. Check all the cables are plugged in right. Loose cables can cause problems with the sound;
7. See if there's an update for your projector. Updates can fix problems with the sound;
8. Keep the room quiet when you're watching something. Close windows and doors to block out noise;
9. Rearrange items in the room or add soft objects like rugs or curtains to reduce echoes;
10. If nothing else works, reset the sound settings. This might help resolve any issues;
11. If none of the above steps resolve the issue, contact your local after-sales for further assistance regarding this issue.