Etymotic ER-4S In Ear Sound Isolating Earphones [HH00450]

Etymotic ER-4S Description

The ER•4S 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.

ER•4S (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 ER•4S matches the response of most typical monitor loudspeakers. The high accuracy and exceptional sound isolation of the ER•4S have made these earphones popular with musicians, recording engineers and audiophiles. ER•4S earphones can be used with a headphone amplifier when using low power portable devices.

The ER•4S earphone has an equalized high frequency response. Most stereo recordings have been equalized, electronically or by choice of microphone type and placement, to sound good with mainstream "good" loudspeakers in typical living rooms. Several studies have been conducted dealing with the subject of loudspeaker response as affected by the listening room. The figure to the right shows the frequency response of loudspeakers considered to be "flat" in five studies. Even a loudspeaker with a perfectly flat power output exhibited a room response 4-10 dB down at 10 kHz, relative to the midband. The ER-4S has been designed with a gradual roll off in the high frequencies similar to that of the curve labeled MCK, which represents a compromise choice. The ER-4S is well suited for all types of stereo recording reproduction.

Etymotic ER-4S Technical Specification

• Response Accuracy: 92%
• Noise Isolation: 35-42 dB
• Frequency response: 50-10 kHz ± 2 dB; 20-16 kHz ±4 dB
• Acoustic polarity: + electrical = + acoustic
• Transducer type: balanced armature
• 1 kHz sensitivity: 108 dB SPL for a 0.79 V input (90 dB @ 0.1 V; 100 dB @ 1mW)
• Impedance: 100 Ohms nominal
• Maximum output: 122 dB SPL
• Maximum continuous input: 3.0 Vrms
• Weight: less than 1 oz.

Package Includes

• ER•4S earphones
• 5 ft. cord with 3.5 mm stereo phone plug
• 1/4" stereo phone adapter plug
• Six 3-flange eartips
• 10 foam eartips
• Filter changing tool
• 4 replacement filters
• Shirt clip
• Pouch (not shown)
• Storage box