Sound comes from the speaker even when the headphones are plugged in.
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If you plug in the headphones not securely during playback, the sound may come from the speaker.
Unplug the headphones, and then insert them securely.
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“Audio Output” in the menu is set to “Speaker,” when you are listening to the radio (ICD-UX543F/UX544F only).
Set “Audio Output” to “Headphones.”