User Manual

3
ABOUT ET YMOTIC RESEARCHABOUT ER•4 EARPHONES
ER•4 MicroPro earphones were the first high-fidelity, in-ear earphones to
use balanced armater drivers.These high definition transducers combine
flat frequency response with passive noise isolation. Noise reduction with
ER•4 MicroPro earphones occurs naturally when the eartips are sealed in
the ear canals. Earphones with active noise-canceling add circuit noise and
require batteries.
The triple-flange eartips provide 35 dB average sound reduction,which is
approximately 98% noise isolation. Foam eartips provide slightly more
(42 dB) average external noise isolation. Lowering surrounding noise allows
the listener to hear the full dynamic range of recordings at lower
reproduction levels.
PROPER C ARE
• Do not expose earphones to extreme temperatures.
• Avoid dropping and strong impact.
• Always leave eartips on the earphones for shock protection.
• Perspiration may cause earphones to temporarily stop working,but
normal operation usually returns after earphones dry out.
• Do not pull on the cord to remove earphones from the jack or from the ear.
• Avoid bending the barrel in the center of the cord.
• Clean or replace eartips prior to use by others.
• Change filters as needed. See Changing the Filters on page 9.