If the sound quality of your Q31i is not as expected, it can usually be improved by raising the audio source quality, optimizing connection stability, switching to a suitable Bluetooth codec, turning off overlapping phone sound effects, or adjusting the EQ in the app. Alternatively, the issue may also be related to LDAC. Most cases can be resolved by following the steps below in order.

Before You Start: Please make sure the headphone is powered on and connected to a device.

Troubleshooting Steps:

1. Improve the audio source quality: The quality of the audio file itself is critical. If possible, try playing lossless formats such as FLAC or WAV, and avoid MP3 files below 128kbps.

2. Optimize connection stability:

1. Reduce interference: Stay away from devices that use the 2.4GHz band, such as Wi-Fi routers, microwaves, and other Bluetooth devices.

2. Avoid obstacles: Make sure there are no walls or metal objects between the phone and the headphone.

3. Check the Bluetooth audio codec: Different Bluetooth codecs offer different sound quality. SBC (the basic codec) has a higher compression rate and more noticeable quality loss; AAC, commonly used by Apple devices, offers better quality than SBC; LDAC supports a higher transmission rate and the best quality (requires an Android 8.0 or above device). You can try switching to a suitable codec in the phone's Bluetooth settings.

4. Check the phone's sound effect settings: Turn off the phone's system sound effects such as "3D Sound" or "Equalizer" to avoid overlapping with the headphone's own tuning.

5. Adjust sound effects in the app: Open the soundcore app and explore the options to tailor the sound to your preference—you can choose a preset EQ style, create a custom EQ, or enable LDAC mode for the best audio quality on supported Android phones. Feel free to try different combinations to find the one that suits you best.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.