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No audio in one ear | SoundTrue® in-ear headphones
Be sure the openings on your headphones are clean and free of debris.
Check if anything is blocking any openings on your headphones, ear tips or the mesh grilles under the ear tips (i.e. ear wax, dust or other debris). For more info, see Cleaning ear tips and mesh grilles.
Try a different app.
If the issue only occurs with a particular app, it is likely related to the app or app settings.
Try playing different types of media.
Different media types might produce different quality sound. For example, Podcasts, music stored locally on your phone, MP3s, streaming music services (Spotify, Pandora), videos on your device or stored in the cloud, etc. can all vary in quality. Try different media to determine if the issue is specific to certain media.
Check the condition of the audio plug on your product.
If the audio connector on your product is broken, frayed or damaged, it might not play audio as expected. If it is damaged, your product may need service.
Plug in a different pair of headphones.
Connect another pair of headphones to the audio device to determine if the issue is with the device or its settings.