64 Audio U4s 4 Driver Hybrid Universal In Ear Monitor

Key Features:
  • 4 driver hybrid design
  • Rich, natural bass timbre
  • Apex pressure relief system
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U4s is a quad driver hybrid UIEM featuring ground-breaking patented technologies originally developed for 64 Audio's flagship products. Launched as 64 Audio's most accessible universal IEM to date, U4s will bring an even wider audience closer to their music.

U4s sounds light on its feet while effortlessly delivering physically engaging sub-bass without bleeding into the mid-bass. Balanced mid frequencies and a pleasant high-mid band respond well to a wide array of music and recording styles at every volume level; present but not fatiguing. The tia high-driver’s open airy quality couples with the extended sound-stage provided by apex for a lifelike sonic experience.

The ergonomic anodized aluminum shell of the U4s houses a single dynamic driver, two balanced-armature drivers, and one patented tia driver; all weaved together with 64 Audio's patented Tia, LID, and Apex technology. The four-way crossover is elevated with the use of our proprietary electronic low-pass filter; reducing low- frequency distortion. The assortment of included apex modules and ear tips are 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 64 Audio's product range brings that classic 64 Audio sound signature to a new price-point.


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What's in the box

  • U4s Universal In-Ear Monitors
  • 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


Transducer Type Dynamic & Balanced Armature
Transducer Configuration 1 dynamic low, 1 BA low-mid, 1 BA high-mid, 1 tia high
Bore Configuration Single
Frequency Response 10Hz – 20kHz
Sensitivity 107 dB/mW (94mV) @ 1kHz
Impedance 11Ω @ 1kHz
Crossover Integrated 4-way passive crossover
Isolation 20dB w/ m20 module, -15dB w/ m15 module, -10dB w/ mX module

Audio Performance

Drivers4 Drivers
Sound Signature
Deep bass and forward highs


Low Mid

Mid High


Resolution (7)

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With nearly two decades experience as a sound engineer, Vitaliy Belonozhko founded 64 Audio when he discovered the advantages of IEMs over traditional floor wedges. With unique technologies such as the Tia tubeless driver design and the Apex pressure relief system, 64 Audio consistently aims for high performance, balanced sound with practical, ergonomic fit.

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64 Audio