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The ER-4P, part of the Etymotic Research MicroPro series, are optimized for usage with portable media players. Such devices often lack the capability to properly drive high-end earphones, and the ER-4P is specifically balanced to account for this. They offer 98% noise isolation and a braided cable to reduce microphonic effects when listening.


  • Status: Available
  • Availability date: 2004
  • Price at launch: $330.00


  • Alias: ER4P

Also Known As...

  • Color: Black
  • Design: In-ear
  • Physical attachment: Clip-on
  • Connection type: Wired (3.5mm)
  • Wire length: 60.0 inches


  • Drivers per ear: 1
  • Impedance : 27 Ω
  • Frequency response (low): 20 Hz
  • Frequency response (high): 16000 Hz


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