Westone Audio ES40 Earphones


Experience pure audio excellence with the Westone Audio ES40 in-ear monitors. Featuring 4 meticulously tuned balanced armature drivers and Westone’s patented acoustic innovations, the ES40 earphones deliver incredibly detailed sound shaped by over 50 years of audiophile engineering mastery. Custom molded shells crafted from ear impressions allow a personalized fit for superior noise isolation and all-day comfort. Built rugged with MMCX detachable cables, the ES40s shine in the studio or on stage. Rediscover your music library through the ES40’s spacious soundstage and nuanced tuning. Let Westone’s passion for high-fidelity audio transport your listening.


ES40 Elite Series 4-Driver Custom In-Ear Monitor

Experience pure audio excellence with the Westone Audio ES40 in-ear monitors. With four meticulously tuned balanced armature drivers and Westone’s patented acoustic technologies, the ES40s deliver sophisticated sound shaped by over 50 years of engineering mastery.

The four-driver design produces strikingly detailed and dynamic sound across sparkling highs, warm midranges, and deep bass. Custom molded shells crafted from ear impressions provide a personalized ergonomic fit and superior noise isolation. This allows you to become fully immersed in your music.

Built for durability with detachable cables using robust MMCX connectors, the ES40s are at home on stage or in the studio. Musicians will appreciate the comfortable fit and sound clarity while monitoring live shows. Whether you’re an audiophile, musician, or casual listener, rediscover your favorite tracks through the ES40’s balanced, nuanced sound.

The sleek, modern styling matches the ES40’s exceptional performance. And with included accessories like a rugged carrying case, cleaning tool, and different eartip sizes, you have everything needed to enjoy these earphones anywhere.

Experience Westone’s passionate pursuit of audio perfection with the meticulously engineered ES40 in-ear monitors. Let your music shine as never before.

Get the perfect fit with custom-molded earphones. Unparallelled Audio Quality!

  • Westone Audio Custom-Fit Technology
    Fully custom earpieces are cast, sculpted, and polished by hand from actual impressions of your ears, resulting in the best fit and acoustic seal possible.
  • Balanced Armature
    Westone Audio’s balanced armature driver is significantly more compact and efficient than a traditional dynamic driver. Westone Audio monitors provide enhanced sonic detail and frequency range that extends well beyond typical in-ear solutions.
  • Flex Canal
    A body temperature-reactive, semisoft earpiece canal additive that stays firm at room temperature for ease of insertion and then softens at body temperature, allowing increased comfort and acoustic seal for incredible noise isolation.
  • Cold Pour Acrylic
    Earpiece housings are cold-poured in acrylic for a thicker, more resilient acoustic enclosure. Expect increased durability, a more controlled response, and a lustrous appearance from this Westone Audio technology.
  • Dual Bore
    With Westone Audio’s Dual Bore technology, high and low frequency sound components are channelled through separate passages in the sound port and sum within your ear canal instead of the earpiece. The result is audibly more natural and provides a more convincing transition between frequency ranges.
  • EPIC Replaceable Cable
    Westone Audio’s robust EPIC cable is constructed of bifurcated, high-flex, ultra-low resistance tinsel wire, reinforced with a special aramid fiber, and braided for ultimate durability, acoustic transparency, and isolation from mechanical cable noise. The MMCX Audio™ connector makes this solution conveniently user replaceable.
  • Handcrafted in the USA
    Meticulously built by a staff of dedicated artisans and lab techs, Westone Audio’s USA products exhibit a level of craftsmanship that truly embodies America’s rich history of handmade artistry.
Westone Audio ES40 Earphones
Westone Audio ES40 Earphones

Experience the Westone Audio ES40 In-Ear Monitors

  • More neutral sound signature with a flatter response
  • Better for singers, guitarists, and engineers
  • The ES80 is perfect for pure mastered music as well as performing


Download the ES40 Technical Specifications sheet (pdf)

See our other Earphones in the Elite Series: ES10, ES20, ES30, ES50, ES60, ES70, ES80


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Westone Audio ES40 Earphones