User Manual

ABOUT ET YMOTIC RESEARCH
4
DESCRIPTIONS
ER•4P earphones can be used with any audio source without requiring an
additional amplifier. ER•4P earphones have 10 dB greater output at high
frequencies and 13 dB greater output at low frequencies than ER•4S
earphones.The higher sensitivity and enhanced bass of the ER•4P earphones
have made them Etymotic’s most popular premium earphones.
ER•4S earphones were designed to compensate for the high frequency
emphasis in all CD recordings,in order to provide accurate sound
reproduction.The high accuracy and exceptional sound isolation of the
ER•4S have made these earphones popular with musicians,recording
engineers and audiophiles.Performing musicians often use them as in-ear
monitors because the response of the ER•4S matches the response of most
monitor loudspeakers.
ER•4B earphones may be preferred by those who want to hear the slight
high-frequency boost which is standard practice in CD and vinyl recordings
(5 dB at 10 kHz). ER•4B earphones were originally designed to provide an
eardrum-pressure frequency response closely mimicking that of the open ear
in a diffuse sound field,making them ideal for any material that has not been
equalized for loudspeaker playback,such as properly equalized binaural
recordings.Many early listeners found the 4B earphones a bit bright,which
led to the introduction of the ER•4S.