Etymotic ER-4P In Ear Sound Isolating Earphones [HH00279]

Etymotic ER-4P Description

Etymotic ER-4P in-ear sound isolating earphones.  The ER-4P earphones are the next best thing to live music, with noise isolation far surpassing that of active noise-canceling earphones. The ER-4P 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.  True high fidelity sound reproduction requires the reproduced sound to be as close as possible to the sound of a live performance. Etymotic earphones are designed to match the acoustic response of the open ear.

ER-4P (Portable) earphones can be used with portable CD, MP3, DVD and other players without requiring an additional amplifier. As compared to the ER-4S, the ER-4P has 10 dB greater output at high frequencies and 13 dB greater output at low frequencies. The higher sensitivity and enhanced bass of the ER-4P have made it the most popular earphone for most uses.  

The ER-4P 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 figures 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.

Etymotic ER-4P Technical Specification

• Response Accuracy: 86%
• 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 0.2 V input (102 dB @ 0.1 V; 106 dB @ 1mW)
• Impedance: 27 Ohms nominal
• Maximum output: 122 dB SPL
• Maximum continuous input: 0.75 Vrms
• Weight: less than 1 oz.

Package Includes

• ER-4P 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