Etymotic ER4XR In-Ear Extended Response Earphones

Here we have the Etymotic ER4 Extended Response model headphones. These are new open box headphones from our retail store.  They come in the original box with the accessories.  The box has some "retail" wear on it that can be seen in the photos.

From Etymotic:

In-ear Invented here:

Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic’s original design, developed for auditory research and hearing testing, used balanced –armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. ER4 earphones were the first high-fidelity, noise isolating in-ear earphones to use this technology in a consumer earphone, and are recognized as the world leader for response accuracy to which all other earphones are compared.

In a Class by Itself

Etymotic invented noise-isolating, in-ear earphones. The ER4 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.

Backed by decades of research and development for the ear

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

Features

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

Highest noise isolation

• First earphones to completely seal the ear
• 98% (35 dB - 42 dB) noise isolation —highest 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

What’s In the Box?

• Earphones
• Detachable, 5 ft. cord with 3.5mm gold plated stereo plug
• ¼” stereo phone adaptor
• Assortment of eartips
• Filter removal tool and replacement filters
• Shirt clip
• Zippered storage case