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Etymotic ER4-XR-BT Extended Response In Ear Earphones with Detachable Bluetooth Cable

  • Accuracy in the midrange and high frequencies with extra presence in low end
  • Includes Etymotion Bluetooth cable
  • Precision-matched custom-tuned balanced-armature drivers
  • Industry-exclusive channel-matching compliance graph
  • Replaceable filters protect the balanced-armature drivers from ear wax
  • Reinforced cable for extended durability

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  • Etymotic ER4-XR-BT

    Etymotic ER4-XR-BT 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 ER4-SR, the ER4-XR is built with precision machined, anodized and laser-etched aluminium body and offers user-replaceable detachable cables. Paired with the new Etymotion Wireless Bluetooth cable these earphones are unstoppable and sound better than anything else on the market today.

    ER4-XR-BT incorporates the stringent channel-matching standard used in the ER4-SR. The ER4-XR is ideal for anyone looking for exceptional sound quality with just the right amount of low-end enhancement. An assortment of ACCU-Fit eartips is provided in the package of the ER4-XR earphones. The triple-flange eartips reduce sound an average of 35dB, while the foam eartips provide slightly more sound reduction of 42dB.

    Etymotic's original insert earphone design, developed for auditory research and medical diagnostics, used balanced armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones.

    Decades of research and development.


    Leading Technology
    Etymotic ER4 series earphones were the first earphones commercialised using balanced armature driver technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. ER4XR offers high accuracy, but with slightly enhanced bass.

    Etymotion Bluetooth Cable
    Paired with the new Etymotion Wireless Bluetooth cable these earphones are unstoppable and sound better than anything else on the market today. With built in functionality to answer calls, play/pause, and change tracks it’s the ultimate in audiophile portability.

    Superior Isolation
    Providing the highest noise isolation of any earphones or headphones on the market today, Etymotic ER4-XR include an assortment of noise-isolating ACCU-Fit eartips options to ensure proper seal and comfort.

    Durable Design
    The user-replaceable ACCU-Filter acoustic dampers are not only a part of the ACCU-Chamber driver housing, but also protect the balanced armature driver from ear wax. Etymotic also includes a 2 year warranty.

    Technical Specifications

    • Transducer type: High performance, balanced armature micro-drivers
    • Response Accuracy: 92%
    • Noise Isolation: 35-42dB
    • Frequency response: 20Hz - 16kHz
    • Sensitivity: 98dB
    • Impedance: 45Ω
    • Sound Pressure Level: 122dB
    • Cable length: 1.5m
    • Connection: 3.5mm stereo plug


    • Unsurpassed accuracy in the midrange and high frequencies with slight low-end boost
    • Etymotion Bluetooth cable offers high resolution wireless listening
    • ACCU-Driver balanced-armature, precision-matched, custom-tuned drivers
    • An assortment of noise-isolating ACCU-Fit eartip options to ensure proper seal and comfort
    • Reduction of outside noise reduces the risk of listening at unsafe levels
    • Braid-reinforced cable for enhanced durability and low microphonic effect
    • ACCU-Filter user-replaceable filters protect the balanced-armature drivers from ear wax
    • 2-year replacement warranty


    Package Includes

    • Etymotic ER4-XR Extended Response Earphones
    • Etymotion Bluetooth cable
    • 6.35mm stereo adaptor
    • Assortment of ACCU-Fit eartips
    • Filter changing tool and replacement ACCU-Filter wax filters
    • Shirt clip
    • Airline adaptor
    • Travel pouch
    • Storage box
    • Channel-matching compliance graph
    1. ColourGrey
    2. Frequency Response20Hz - 16kHz
    3. Impedance45Ω
    4. Manufacturer Warranty2 Years
    5. Number of drivers1
    6. Part NumberER4XR-BT
    7. Sensitivity98dB
    8. Included AccessoriesEtymotion Wireless Bluetooth cable, 6.35mm stereo adaptor, Eartips, Filter changing tool and wax filters, Shirt clip, Airline adaptor, Travel pouch, Storage box, Compliance graph