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No audio in one ear | QuietControl™ 30 wireless 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.
Reset your product.
Much like rebooting a smartphone, your product might need to be reset on occasion to correct minor issues. For more information, see Resetting your product.