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Introducing 64 Audio’s newest hybrid four driver Universal in-ear monitor, U4s.


Featuring the same ground-breaking patented technologies originally developed for 64Audio's flagship In Ear Monitors the U4s is here to be accessible and help bring a wider audience closer to their music.


The U4s looks super sharp and explores a bold new color aesthetic for 64 Audio. The Slate Blue shell color was influenced by some of the world’s most beautiful blue- dial timepieces while the unique faceplate pattern is inspired by Muonionalusta meteorite fragments. Both the faceplate and shell’s illuminant properties give it a unique tone in varying lighting conditions.


Like all 64Audio universals, the U4s is made up from ergonomic anodized aluminum shell which house a single dynamic driver, two balanced-armature drivers, and one patented tia driver. As we mentioned, this in an IEM packed with tech and these drivers are weaved together using their our patented Tia, LID, and Apex technology.


Like the U18s, the four-way crossover is elevated with the use of our proprietary electrical low-pass filter; reducing low- frequency distortion. Coupled with the assortment of included apex modules and ear tips, this is an invitation to further shape the sound based on preference and source material while the ultra- low impedance premium silver-plated copper cable ensures unimpeded signal transmission. The dissemination of tia technology within our product range brings that classic 64 Audio sound signature to a new price-point and we are very impressed with his IEM that punches well above it's weight!


We now have the U4s available to Demo at DCA, so if you want to know how this stacks up against the other IEMs in the 64Audio range including, the Volür, A18s and Fourté, please do get in touch!


Main Features:

  • Quad driver Hybrid IEM with 4 way crossover for extended bass response.
  • Packed with 64 Audio's patented tech - TIA, APEX and LID.
  • Detachable 2pin silver-plated copper cable.
  • Scuplt your sound with the included M20, M15 and MX modules.
  • Also available as a custom shell with exclusive free 3D Impressions at DCA.



  • 64 Audio Premium Leather Case
  • TrueFidelity Foam Ear Tips (S,M,L)
  • SpinFit Silicone Ear Tips (S,M,L)
  • Silicone Ear Tips (S,M,L)
  • 3.5mm Black Premium Cable
  • Apex Modules: m20, m15, mX
  • Cable Clip
  • Cleaning Tool
  • Round Sticker

64 Audio U4s

    • Transducer Type: Balanced Armature & Dynamic drivers
    • Transducer Configuration: 1 Dynamic Low, 1 BA Low-mid, 1 BA high-mid, 1 TIA high
    • Bore Configuration: Single
    • Frequency Response: 10Hz – 20kHz
    • Sensitivity: 107dB/mW (94mV) @ 1kHz
    • Impedance: 11Ω @ 1kHz
    • Crossover: Integrated 4-way passive crossover
    • Isolation: 20dB - 10dB with corresponding APEX modules
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