Etymotic Research ER-4S Consumer Headphones

The ER 4 MicroPro earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-canceling earphones. The ER 4s require NO batteries, and can be plugged into any audio source. Their external noise exclusion -- 35 dB with 3-flange eartips, 42 dB with foam eartips -- allows you to hear the full dynamic range of recordings without having to play them at unnaturally high and unsafe levels. The earphones come in three styles: ER 4B, ER 4S, ER 4P.

ER-4S Stereo earphone have the most accurate frequency response for reproducing CD and MP3 recordings. The sensitivity is comparable to home and professional earphones. ER-4S Stereo earphone are ideal for home stereo use and computer use. ER-4S Stereo earphone can be used with a Earphone amplifier when using low power portable devices. ER-4S is the earphone preferred by musicians and audiophiles.

ER4S (Stereo) earphones were designed to compensate for the high frequency emphasis in all CD recordings, in order to provide accurate sound reproduction.

ER4S (Stereo) earphones were designed to compensate for the high frequency emphasis in all CD recordings, in order to provide accurate sound reproduction.

ER4S (Stereo) earphones were designed to compensate for the high frequency emphasis in all CD recordings, in order to provide accurate sound reproduction.

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High fidelity earphone - white box Etymotic ER-4S MicroPro Reference Stereo Earphones ER4S Stereo earphones were designed to compensate for the high frequency emphasis in all CD recordings; in order to provide accurate sound reproduction. Performing musicians often use them as in-ear monitors because the response of the ER4S matches the response of most typical monitor loudspeakers. The high accuracy and exceptional sound isolation of the ER4S have made these earphones popular with musicians; recording engineers and audiophiles. ER4S earphones can be used with a headphone amplifier when using low power portable devices Package Contents: Earphones; 5 ft. cord with plug; 1 / 4" stereo adapter plug; six 3-flange eartips; 10 foam eartips; filter changing tool; 4 replacement filters; shirt clip; zippered pouch; storage box; documentation One Year Mfr. Warranty