Etymotic ER-4 microPro Manuel De L'utilisateur page 8

Etymotic earphones have special filters that smooth the frequency response
and prevent earwax from entering the earphones. An ACCU•Filter
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. The filter should be changed if loudness decreases or the
sound quality declines. Note: ACCU•Filters are not reusable.
ACCU•Filter Removal
1. Remove Eartip.
ACCU•Filter Replacement
1. Insert a new filter.
ABOUT ET YMOTIC RESEARCH
CHANGING FILTERS
Note: Use the tool to remove the filter.
2. Insert tool into
the filter.
Note: Do not use the tool to replace the filter.
2. Press gently
against a hard
surface to secure
the filter in place.
3. Remove filter.
3. Re-attach eartip.
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