hf2 Headset + Earphones
hf2 hf2
About the Filters

hf2 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.
Removal
1. Remove eartip. 2. Insert tool into
    the filter.
3. Remove filter.
    Discard old filter
    Filters are not
    reusable.
Replacement
4. Insert a new filter
    and press gently
    against a hard
    surface to secure
    it in place.
5. Re-attach eartip.


hf2 is a trademark of Etymotic Research, Inc. The earphones are covered by one or more of the following U.S. patents: #4,677,679, #4,763,753, #5,887,070, RE38351 and other patents pending.
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