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Westone UM1 Single Driver IEM Earphones - 2017 Version - Refurbished

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  • Refreshed 2017 version - designed for musicians and music lovers

  • Premium entry-level IEM with incredible audio clarity

  • Single custom-made micro balanced armature driver

  • Detachable cable with custom-designed round MMCX connector

  • Star and True-Fit premium eartips in multiple sizes

Westone UM1 Single Driver IEM Earphones - 2017 Version - Refurbished

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Westone UM1

Refurbished unit in excellent condition repackaged with original accessories or accessories from compatible models and brands.

Building on the legendary first universal-fit balanced armature in-ear monitors, Westone have reinvigorated the UM1 IEM earphones with redesigned drivers and updated round MMCX connection. With specially engineered proprietary single balanced armature drivers that are tuned for a warm and flat frequency response, the UM1 are able to present a fresh sound with any type of music.

Expertly tuned custom-made single balanced-armature drivers, Westone UM1 provides reference level sound for professional musicians just the same as for personal listening. Westone's refreshed UM1 has been equipped with an in-house redesigned removable round cable that incorporates Westone's MMCX Audio connection for a secure and dependable connection.

Also included with the new UM1 is the complete array of premium foam and silicone eartips that come with all flagship Westone music products. With the ability to find the perfect fit with the UM1, the listener is propelled into a personal listening space with 25dB noise attenuation for the complete listening experience.

Class leading detail and precision.


Westone UM1


True-Fit Technology
With over 50 years of experience in designing and making in-ear audio products, Westone are experts in creating low-profile, lightweight, universal-fit monitor earphones that provide the highest comfort and perfect in-ear coupling for the best possible listening experience.

Balanced Armature Drivers
In-house developed proprietary balanced armature drivers, expertly tuned to produce faithful and detailed sound, provide enhanced sonic detail and a broad frequency range that surpasses the norm in earphones for such a compact design.

Custom Connectors
Fitted with custom-designed MMCX micro-miniature coaxial connectors configured to provide a dependable connection when connecting to the earpieces of the UM1 IEM. The connectors have a lock-snap mechanism allowing 360-degree rotation making for a long lasting and versatile connection.

Advanced Noise Isolation
Westone applies many years of in-ear monitor experience with industry-leading noise isolation. With the UM1 earphones, you hear more of the music with 25dB noise reduction with little distraction from external noise.

Made in USA
Meticulously created and designed by a staff of dedicated artisans and lab technicians, Westone's USA products exhibit a level of craftsmanship that truly embodies America's rich history of handmade artistry.



  • Driver: Single balanced armature driver (full range)
  • Sensitivity: 114dB SPL @ 1mW
  • Frequency response: 20Hz - 16kHz
  • Impedance: 19Ω
  • Passive noise attenuation: 25dB
  • Cable: Removable MMCX round cable (1.2m)
  • Connection: 3.5mm angled stereo jack plug

Westone UM1


  • Refreshed and redesigned 2017 version
  • Designed for musicians and music lovers
  • Premium sound with incredible audio clarity
  • Single custom-made micro balanced armature driver
  • Detachable cable with custom-designed round MMCX connector
  • Advanced ergonomic design with comfortable fit
  • Star and True-Fit eartips in multiple sizes
  • Designed and assembled in the USA



  • Westone UM1 Single Driver IEM Earphones with Detachable Cable
  • Five sizes of patented STAR silicone eartips
  • Five sizes of premium True-Fit comfort foam eartips
  • Removable MMCX round cable
  • Mini-monitor pouch


Product TypeEarphones
Feature KeywordComfortable, Ear Canal, IEM, In Ear, Monitor, Noise Isolation, Portable
Recommended UseDigital audio player, Portable audio system
Manufacturer Warranty2 Years
Included AccessoriesFive sizes of STAR silicone eartips, Five sizes of True-Fit comfort foam eartips, Removable MMCX round cable, Mini-monitor pouch
Part Number79484
Headphone Fit TypeIn-Ear
Headphones TypeHeadphones - binaural
Cable EntryNo
Cable Length1.2m
Connector AngleAngled
Connector TypeHeadphones (3.5 mm stereo jack)
Detachable CableYes
Driver SizeNo
Driver TypeBalanced Armature
Connectivity TechnologyWired
Earcup DesignNo
Frequency Response20Hz - 16kHz
Headphones Form FactorIn-Ear
Headphones TechnologyBalanced Armature
Number of DriversSingle Driver
Sound Isolation (dB)25dB
Sound Output ModeStereo
Smartphone CompatibilityNo
Smartphone ControlsNo
Total Harmonic Distortion (THD)No
Wireless TechnologyNo

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