Westone Audio ES40 In-Ear Monitors

From: $1,739.00

ES40 Balanced 3-way, 4-Driver IEMs

Custom-molded 4-driver Earphones with Flex Canal Tips, Cold-pour Acrylic Housings, Balanced-armature Drivers, Dual Bore Frequency Isolation, and Field-replaceable EPIC Cable. Westone ES40 3-Way Balanced Quad Driver Earphones. Ideal for Performing Musicians/On-Stage Monitoring, Personal Listening, Recording, Audiophiles and for singers, guitarists, and engineers.

ES40 Earphones Features:

  • Four balanced armature drivers with passive three-way crossover
  • 25 dB noise reduction
  • Flex canal design improves comfort and acoustic seal
  • Cold pour acrylic earpiece increases durability
  • Cable is replaceable
  • Handles 112 dB SPL
  • 10 Hz – 20 kHz frequency response


The Westone Audio ES40 In-Ear Monitor is engineered to deliver a very balanced, powerful, and articulate sound stage, and delivers a breathtaking and immersive sound that makes the most of any recorded and mastered music. The new dual, low-frequency drivers create thick, rich, and immersive low-frequency information that accentuates today’s recorded music, and is tough enough to survive on the world’s loudest stages. This combination creates an unbelievable listening experience that is sophisticated enough for the most discerning critical listener, but tough enough to survive in the world’s most demanding live-performance venues.

Get the perfect fit with custom-molded In-Ear Monitors. 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 In-Ear Monitors

Experience the Westone 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
  • Cable: Choice of replaceable Superbax, 2-pin or MMCX Audio™ Cable, 128 cm, 162 cm optional
  • Choice of colours for faceplate and body will be offered after the order is completed


Download the ES40 Technical Specifications sheet (pdf)


SKU: 78520
Categories: Custom Series, ES Series
Tags: Custom Series, In-Ear Monitors, ES Series, ES40, es40-In-Ear Monitors, Westone ES40

Additional information

Mould Type

Custom Hand-Pour, Custom 3-D


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Westone Audio ES40 In-Ear Monitors
From: $1,739.00