This is usually caused by vibration and bumps being transmitted through the cable. To resolve it, please do the following:

1. Loop the earphone cables up over the top and back of your ear instead of allowing them to hang straight down. This will reduce or eliminate the noise.

2. If your earphone cables have a cinching slider, tighten your cable up so as to make contact with your skin.

3. If you are participating in a sport or other physical activity, run the cable up and over the top of your ear, tighten your cable cinch (if present) and place the cable cinch at the back of your head near the base of your skull.

Additional Information:

If the above solutions do not resolve your problem, consult Knowledge Base article 14373 for instructions on contacting Logitech Technical Support.