Etymotic ER•4® microPro® Earphones - Manual (Page 8)

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