Etymotic Research ER4S MicroPro Studio Reference In-Ear Monitor Headphones



The Etymotic Research ER4S stereo headphones feature an ultra-lightweight design, up to 42dB of external noise attenuation, and an enhanced output level for both the high and low frequency range, a combination that ensures clear, natural listening enjoyment at safe and moderate playback levels. These headphones have the most accurate frequency response for monitoring musical material, and are recommended for home stereo and computer use, while also satisfying the requirements of most portable devices.

Key Features:

  • Ultra-lightweight audiophile-quality earphones for portable audio listening with transparent, reference-quality sound
  • Custom removable filters shape frequency response, protect earphones from earwax
  • Foam and plastic flange eartips provide comfortable fit and maximum sound isolation
  • Recommended for use with all portable players including Minidisc, CD, DVD and MP3
  • High sensitivity with enhanced bass and high frequency output, no additional amplifier required
  • High external noise exclusion ensures monitoring at safe, moderate listening levels
  • Accurate, real-ear response
Type Balanced Armature Stereo Earphones
Frequency Range 20 Hz to 16 kHz
Impedance 100 Ohms
Sensitivity 108 dB/mW
Maximum Input Power 3.0 Vrms (Continuous)
Connectors 3.5 mm Stereo Mini Plug with 1/4" Adapter
Cable Length 5' (1.5 m)
Weight 1 oz (28 g)

Packaging Information
Package Weight 0.45 lb
Box Dimensions (LxWxH) 6.6 x 5.6 x 2.1"
In The Box
Etymotic Research ER4S - Noise-Attenuating Audiophile Portable Stereo Headphones
5' Cable
1/4" Stereo Phone Adapter
6 x 3-Flange Eartips
10 x Foam Eartips
Filter Changing Tool
4 x Replacement Filters
Shirt Clip
Carrying Pouch
Storage Box
1-Year Limited Warranty

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