If vocals seem pulled to one side, do not immediately turn up the quieter channel or remove a filter. A recording, a source setting, an uneven seal or a hardware problem can produce a similar impression. Change one thing at a time and note what happens.

First check that the recording is not the cause

Use several familiar tracks and a spoken recording that should be centred. Temporarily enable mono playback if your device provides it; this makes the programme signal the same in both channels. Restore stereo afterwards. A single stereo song is not a reliable balance test because instruments may be intentionally panned.

Work through these checks in order

Centre the balance control: check the operating system and the music app. Temporarily bypass EQ, spatial effects and personal hearing profiles so you have a repeatable baseline.
Reseat the ear tips: compare fit on each side. A poor seal may reduce bass without reducing every frequency equally. Different tip sizes in the two ears can be appropriate.
Check the connection: stop playback, fully seat the source plug and inspect for visible damage. Remove any phone case that prevents full insertion.
Compare sources: test the same earphones on another known-working compatible output at low volume. Then try a known-working headset on the original source if available.
Inspect the nozzle: remove the tips and compare the outer mesh under good light. Follow approved surface-cleaning instructions; do not puncture or remove filters as a diagnostic shortcut.

What does the result suggest?

Only one app or recording: focus on that app's mix, processing or output settings. Only one phone or DAC: investigate that source and its adapter. The same IEM remains quieter on multiple sources: the cable, filter or earphone needs closer assessment; this does not prove the driver has failed.

If the cable is detachable, a single test with a confirmed-compatible spare may help. Follow the connector instructions and preserve left/right orientation. Do not force an unfamiliar connector or repeatedly swap shells and cables.

Is the phone balance slider a permanent fix?

It can shift level, but it does not diagnose a clogged filter, loose connection or difference in tone. Record the original setting and investigate the cause before relying on compensation.

When should I ask for help?

Contact support if the difference persists after these checks, started after an impact or is getting worse. Provide the model, affected side, source and results of the second-source test. If you notice a sudden hearing change away from the earphones as well, stop testing equipment and seek prompt medical assessment.

See ear tip fit checks or contact TINHIFI.

Reference: Shure's explanation of reduced output from nozzle debris. This checklist narrows possibilities; it is not a laboratory channel-matching measurement.

For hearing symptoms rather than equipment faults: NHS hearing-loss guidance.

Generated editorial illustration; not a specific TINHIFI model.