Etymotic mc3 Earphones + Headset - Manual (Page 9)

9
Filters
Etymotic earphones have special filters that smooth the frequency
response and prevent earwax from entering the earphones.
A filter is located at the end of the earphone and is visible when
the eartip is removed. If a filter becomes clogged, it should be
replaced. A dirty filter will reduce earphone output. A filter
should be changed if the loudness decreases or the sound
quality declines. Note: Filters are not reusable.
Filter Removal
Note: Use the tool to remove the filter.
Filter Replacement
Note: Do not use the tool to replace the filter.
1. Remove Eartip. 2. Insert tool into
the filter.
3. Remove filter.
1. Insert a new filter and press
gently against a hard surface
to secure it in place.
2. Re-attach eartip.