Etymotic ER4-XR – Noise-Isolating In-ear Earphones


Etymotic Research ER4XR In-Ear Extended Response Earphones
ER4XR is Etymotic’s in-ear monitor for those who demand nothing less than the highest reproduction accuracy in the midrange and treble frequencies, but prefer a tastefully added bass presence. The ER4XR right and left channels are matched within an industry-leading 1dB across frequencies from 100 Hz to 10 kHz.

  • Nicely tuned, with slightly emphasized bass and mid-highs
  • Flange-style ear tips block most ambient noise
  • Very comfortable to wear for long sessions

ER4XR with its tastefully added bass is favoured by audiophiles and consumers who prefer a little extra bass presence when enjoying their music. This model is not bass heavy by any means.


Etymotic ER4xr Noise Isolating Earphones

Etymotic ER4xr MicroPro series earphones with noise isolation

Etymotic invented noise-isolating, in-ear earphones. The Etymotic ER4xr MicroPro series earphones were the first earphones commercialized using balanced armature technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles, and musicians.

Earphones with frequency response accuracy and sound quality

World leader in sound reproduction

  • Unsurpassed frequency response accuracy and sound quality — 92%+ response accuracy from 20 Hz – 16 kHz
  • The only earphones with balanced-armature, precision-matched, custom-tuned drivers
  • Highest output sensitivity in its class

The features of the ER4xr earphones

  • Professional quality and reliability
  • Precision-matched, custom-tuned drivers
  • Precision machined metal bodies with anodized finish
  • Detachable, Kevlar reinforced 5 ft (1.52 m) cable with 3.5 mm gold-plated stereo plug and MMCX connectors.
  • Assortment of noise-isolating ear tip options to ensure proper seal and comfort

Earphones with the highest noise isolation

  • First earphones to completely seal the ear
  • 98% (35 dB – 42 dB) noise isolation. The highest isolation of any earphones or headsets on the market today.
  • Reduction of outside noise reduces the risk of listening at unsafe levels
  • Best durability and warranty
  • 2-year replacement warranty
  • User-replaceable filters protect the balanced-armature drivers from ear wax

Etymotic-ER4XR-headphones-tip1Technical specifications of the ER4xr

  • Frequency Response: 20 Hz – 16 kHz
  • Transducers: Single high-performance balanced armature per channel
  • Noise Isolation: 35dB using silicone ear tips, 42dB using foam ear tips
  • Impedance: 45 Ohms @ 1kHz
  • Sensitivity: 98 dB @ 1kHz, 1mW
  • Maximum Output (SPL): 122 dB
  • Cable: Detachable reinforced, twisted 5 ft with MMCX connectors
  • User Replaceable ACCU-Filters: Yes
  • Warranty: 2 Years
  • Custom-Fit Option is available

What’s In the Box?

  • ER4xr Earphones
  • Detachable, 5 ft. cord with 3.5mm gold-plated stereo plug
  • ¼” stereo phone adaptor
  • Assortment of ear tips
  • Filter removal tool and replacement filters
  • Shirt clip
  • Handy zippered storage case
  • Performance certificate


ER4XR is the earphone for music lovers and Hi-Fi enthusiasts who want uncompromising accuracy in the midrange and high frequencies, but appreciate a bit of extra presence in the lower end. Like the ER4SR, the ER4XR is built with precision machined, anodized and laser-etched aluminum bodies and features user-replaceable detachable cables. The ER4XR also incorporates the stringent channel-matching standard used in the ER4SR. The ER4XR is ideal for anyone looking for exceptional sound quality with just the right amount of low-end enhancement.

Accurate Earphone Reproduction

For earphones to have 100% accuracy, a recording of a live performance must produce exactly the same sound at the eardrum as the original performance. To achieve this, the acoustic properties of the ear must be factored in. The acoustic resonance and horn effects of the ear change a flat audio signal entering the open ear into sound with a (2700 Hz) high-frequency boost, which is the same response heard at the eardrum in a typical ear.

Technical Specs of the ER4xr Earphones

Frequency Response 20 Hz – 16 kHz
Transducers High performance, balanced armature micro-drivers
Noise Isolation 35-42 dB
Impedance (@1kHz) 4XR (45 Ohms) 4SR (45 Ohms)
Sensitivity (@1 kHz) SPL at 0.1v 4XR (98 dB) 4SR (98 dB)
Maximum Output (SPL) 122 dB
Cable 5 ft Detachable
User Replaceable ACCU-Filters Yes
Warranty 2 Years
Custom-Fit Option Yes


The World’s Most Accurate Earphones Just Got Better!



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Etymotic ER4-XR – Noise-Isolating In-ear Earphones