If your UE 600vi earphones sound muffled, this can be due to a number of causes.

• You may need to clean your earphones. Please see Knowledge Base article 20850 for instructions on the proper cleaning of your earphones.

• Your earphones may be improperly fitted. Please see Knowledge Base article 20999 for instructions on properly fitting your earphones to your ears.

• Your earphone filters may be wet. Please see Knowledge Base article 20853 for instructions on drying your earphones.