How to avoid feedback/squealing sound of PHA10

A high-pitched screech or squeal from an electronic device is called feedback, and it can happen for a number of reasons. The most effective way to fix the problem is to determine the source of the problem, which might be:

Improper Fit: There’s air escaping from the space between the gap between the device and your ear canal. Ensure you wear them BEFORE you turn on the PHA10, pick the right sized buds and wear them tightly to prevent the air from escaping.

Ear Wax: If ear wax is blocking your ear canal, sound may have nowhere else to go but out the vents and joins of the device, causing squealing feedback. Clean the earwax in the ear canal at least twice a week.