Etymotic Research, Inc.

ER•4 MicroPro™ Earphones

Changing Filters
ER•4 MicroPro Earphones have special filters that shape the frequency response and prevent earwax from entering the earphones. These filters, a green acoustic mesh in a small metal barrel, are located at the end of the earphones and are visible when the eartips are removed. A dirty filter will reduce or block the earphone output (a filter may be blocked without appearing to be dirty). If one or both earphones stops working, or if the volume decreases, the filter should be replaced. The frequency with which the filters need to be changed will vary widely among users.

1. Remove eartip. 2. Remove filter with
tool. Discard old filter
(filters are not
reusable). 3. Insert new filter.

4. Gently press flush
against flat surface. 5. Attach eartip.

BUY NOW
For $299 a pair

	Accessories

	Earphone Comparison

	Which ER•4 Is Right for You?

	Background

	Technical Specifications

	Instructions for Use

	About the Filters

	Reviews

	Customer Feedback

	In-the-Ear Technology

	How We Measure Response Accuracy

	How We Measure Noise Isolation

	Warranty Information

	Dealer Locator

ER•4 User Guide
» 208 KB

ER•4 MicroPro is a trademark of Etymotic Research, Inc. The ER•4 MicroPro 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.