Etymotic ER-4 microPro Manuel De L'utilisateur page 2

INTRODUCTION
ER•4 MicroPro earphones, the first noise-isolating high-fidelity in-ear
earphones, used high performance, balanced armature drivers. These
high-definition transducers combine flat frequency response with passive
noise isolation. Noise reduction with ER•4 earphones occurs naturally
when the eartips are sealed in the ear canals.
Included with the earphones is a Channel-Matching Compliance Graph
showing a frequency response curve for each custom-tuned, balanced
armature driver.
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An assortment of ACCU•Fit eartips is provided in this package. The triple-
flange eartips reduce sound an average of 35 dB, which is approximately
98% noise reduction. The foam eartips provide slightly more (42 dB) sound
reduction. Lowering outside sound allows you to hear the full dynamic range
of the recording without having to play it at unsafe levels.
The ER•4 MicroPro series earphones produce the highest sound quality
of any high-definition earphones on the market today. We know you
will enjoy them.
Etymotic Research
You know your music. Etymotic know your ears.
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