If the sound on your Space One headphones feels off-center — for example, one side is quieeter than the other — the steps below can help restore balanced sound. Start from the top and work your way down.

1. Check Your Wearing Direction and Seal

Incorrect wearing direction or a poor seal around the ears can cause perceived left-right imbalance in both sound and ANC.

• Make sure the headphones are worn on the correct sides (L = left, R = right).

• Adjust the headband so the ear cups fully cover both ears. A poor seal affects sound performance — if the left and right sides leak differently, the imbalance becomes more noticeable.

Refer to the "ANC Effect Is Poor" section in the product FAQ for more detail.

2. Check the Wear Detection Sensor

The wear detection sensor is located inside the left earcup. If the sensor is blocked or dirty, it may cause abnormal behavior on the left side — including unintended auto-pause, which can feel like the left side stopped working.

• Make sure no hair or clothing is covering the sensor hole inside the left earcup while wearing.

• When taking off the headphones, flip the left earcup to avoid false triggering.

• If the sensor mirror inside the left earcup is dirty or has condensation, gently wipe it with a cotton swab dipped in alcohol until clean. Do not wipe forcefully, as this may scratch the lens.

• You can also perform Wearing Calibration in the soundcore app: Settings → Wearing Detection → Wearing Calibration. Follow the on-screen guide images — improper placement may cause calibration to fail.

3. Check Volume Synchronization Settings

On some Android phones, the headphone volume does not sync with the device volume by default, which can cause perceived left-right volume inconsistency.

For most Android phones:

Enter Developer Mode and enable the Absolute Volume setting:

1. Go to Settings → About Phone → Build Number.

2. Tap "Build Number" repeatedly (usually 5–10 times) until a notification confirms Developer Mode is enabled.

3. Go to Settings → Developer Options and enable Absolute Volume.

The exact menu names may vary by phone model. If the above path does not work, search online for your specific model's Developer Mode instructions.

For HarmonyOS phones:

Enable volume synchronization directly in the Bluetooth settings — tap the connected device name and toggle the volume sync option.

Important: Media volume and call volume are independent of each other. Adjusting volume during a call does not change the media volume bar, and vice versa. This is normal behavior and does not indicate a sync problem.

4. Test with a Different Device

This helps determine whether the problem is with the headphones or the original device.

1. Connect Space One to another phone, tablet, or computer.

2. Play audio and check if the issue remains:

• If the issue persists on the second device → the problem is with the headphones. Continue to the next steps.

• If the issue disappears on the second device → the original device may have compatibility issues, channel balance settings, or audio routing problems. Check Bluetooth settings and audio output on that device.

5. Reset the Headphones

A factory reset clears software states that may be causing abnormal channel behavior.

1. Turn on the headphones.

2. Press and hold the Power button + Volume Up button for 5 seconds.

3. The power indicator light will flash slowly three times in red, indicating the factory reset has started.

Note: After a factory reset, all function settings return to their defaults. For example, Wear Detection will be turned off. Reconfigure your settings afterward.

6. Update Firmware

Outdated firmware may cause channel abnormalities. Make sure your headphones are running the latest version:

1. Open the soundcore app.

2. If a firmware update pop-up appears, follow the on-screen instructions.

3. You can also manually check in the app: Settings → Update Firmware.

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