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    Westone W40 Quadruple Drivers IEM Earphones with Detachable Cable

    • Four custom micro balanced armature drivers with three-way crossover
    • Enhanced sonic detail with breathtaking clarity and realism
    • EPIC audio cable for stunning audio resolution
    • Apple compatible audio cable with 3-button controls
    • Black, blue and red colour exchangeable faceplates
    • Westone W40

      Westone packs four custom-made balanced armature drivers into the W40 monitor earphones to elevate your listening experience to higher realms. With the resulting clarity and realism that the four dedicated drivers produce the W40 will take your listening experience to an entirely new level with unique, warm sound and balance.

      Westone has configured the four balanced armature drivers together with the advanced 3-way crossover network. This creates a significantly higher impact than traditional dynamic drivers, making for enhanced sonic detail and a frequency range that extends well beyond typical in-ear monitors.

      To convey the high-fidelity sound of the W40 in total balance and without colouration, Westone have created the EPIC detachable cable. It has been crafted from highly innovative wire, reinforced with a special aramid fibre, and braided for durability. This EPIC cable eliminates cable noise while transferring pure and unadulterated sound.

      Breathtaking clarity and realism.

      Westone W40


      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.

      Advanced Balanced Armatures
      Custom designed and expertly tuned balanced armature drivers with smaller dimensions than standard dynamic models provide enhanced sonic detail and a broad frequency range. With the combination of four BA drivers in an advanced crossover design, the W40 in-ear monitors provide enhanced sonic detail with exciting clarity and realism.

      EPIC Cable
      Westone’s robust replaceable cable is constructed of bifurcated, high-flex, ultra-low resistance tensile wire, reinforced with a special aramid fibre, and braided for ultimate durability, acoustic transparency, and isolation from mechanical cable noise.

      Apple Compatible Cable
      Equipped with Apple certified 3-button MFi cable with control system and microphone, the W40 is able to connect and manipulate volume, track control, call control and Siri activation on Apple products.

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



      • Driver: Four balanced armature drivers with three-way crossover (single low, single mid, dual high-frequency drivers)
      • Sensitivity: 118dB SPL @ 1mW
      • Frequency response: 10Hz - 18kHz
      • Impedance: 31Ω @ 1kHz
      • Passive noise attenuation: 25dB
      • Cable: MFi and EPIC Replaceable (1.28m)


      Westone W40



      • Enhanced sonic detail with breathtaking clarity and realism
      • Four custom-made micro balanced armature drivers
      • Separate drivers for bass, midrange and high frequencies
      • Advanced three-way crossover design
      • Detachable EPIC cable for stunning audio resolution
      • Star and True-Fit eartips in multiple sizes
      • Apple compatible cable and EPIC audio cable
      • Black, blue and red colour exchangeable faceplates
      • Designed and assembled in the USA



      • Westone W40 Quadruple Drivers IEM Earphones
      • Five sizes of patented STAR silicone eartips
      • Five sizes of premium True-Fit comfort foam eartips
      • MFi audio cable with Apple compatible three button controls
      • EPIC 3.5mm braided audio cable
      • Exchangeable black, blue and red colour faceplates
      • Cleaning tool
      • Mini-monitor vault


      1. BrandWestone
      2. Cable LengthLess than 1.5m
      3. Cable Length Text1.28m
      4. ColourBlack
      5. Connectivity TechnologyWired
      6. Connector AngleAngled
      7. Connector TypeHeadphones (3.5 mm stereo jack)
      8. Detachable CableYes
      9. Driver TypeBalanced Armature
      10. Frequency Response10Hz - 18kHz
      11. Headphones TechnologyBalanced Armature
      12. Headphones TypeHeadphones - binaural
      13. Headphone Fit TypeIn-Ear
      14. Impedance31Ω
      15. Manufacturer Warranty2 Years
      16. Number of driversQuad Drivers
      17. GTIN602353785049
      18. Part Number78504
      19. Product TypeEarphones
      20. Recommended useDigital audio player;Mobile phone;Portable audio system
      21. Feature keywordApple;Comfortable;Ear Canal;IEM;In Ear;iPhone;Microphone;Monitor;Noise Isolation;Portable;Smartphone
      22. Sensitivity118dB
      23. Smartphone CompatibilityApple 3 Button Remote
      24. Smartphone ControlsCall Answer/Hangup;Music Track Fwd/Back;Volume Control
      25. Sound Output ModeStereo
      26. Headphones Form FactorIn-Ear
      27. Included AccessoriesSilicone eartips, Foam eartips, MFi audio cable, EPIC audio cable, Faceplates, Cleaning tool, Monitor vault
      28. Product WeightMale
      29. Sound Output ModeStereo