ETYMOTIC Isolator earphones have special filters that smooth the frequency response and prevent earwax from entering the earphones. These filters are located at the tip of the earphone and are visible when the eartip is removed. If the filters become clogged they should be replaced. A dirty filter will reduce earphone output. The frequency with which the filters need to be changed varies widely among users. The filters should be changed if the volume decreases or the sound quality declines.

1. Take off the eartip.	2. Line up the tip of the screw with the white dot in the middle of the filter.	3. Push the screw into the old filter with a slow twisting motion until it grabs the filter.	4. Pull the filter straight out. Discard the old filter. Filters are not reusable.

1. Hold the earphone upright facing you. Note the notch at the top of the earphone rim. The filter has a groove in it which must line up with the notch on the earphone rim.	2. With your fingers, place the filter into the end of the earphone and line up the notch and the groove.	3. Push gently on the filter and it will lock into place.