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Following the success of Trió and Fourté, Duo is a two driver hybrid universal in-ear monitor featuring a fully tubeless design and is one of the worlds only semi-open back UIEMs. Packed with experience enhancing tech 64Audio is reknowned for, the Duo boasts the complete Tia System, Apex Core, Wave Sync, and LID, presenting 64 Audio’s signature balanced sound in a whole new way.


Don't be fooled by the simple design, this unassuming IEM will draw you in and help you forget you're wearing IEMs in the first place.


One feature we love at DCA is the APEX Core faceplate. The complex grill protects the TIA components inside but also allow air to flow freely, better balancing air pressures and culminates in an elegant design reminiscent of open-back over-ear headphones.


How do they sound?

Well, we think the best way to feel how they sound is booking in for a Demo, but here are 64 Audio's tasting notes:

"Duo feels light, leaving your ears feeling open and relaxed even for long listening periods. You feel simultaneously connected to your physical surroundings while you’re enveloped by music. Relaxed tonality lets you put them on and get lost. It’s able to present a non-analytical top-end while retaining air and sizzle. The vast open air sensation supports an unobstructed soundstage with impactful center imaging (unlike many other open back headphones) as well as no loss of bass. Duo effortlessly produces deep and rich low frequencies with plenty of sub bass."


Main Features:

  • A hybrid design using 64Audio's patented technology.
  • Innovative APEX Core faceplates let the IEM's balance with the atmosphere for excellent sound reproduction and reduced fatigue for long listening sessions.
  • Wavesync tech for a very detailed and fully coherent sound.



  • 64 Audio Premium Leather Case
  • TrueFidelity Foam Eartips (S,M,L)
  • SpinFit Silicone Eartips (S,M,L)
  • Silicone Eartips (S,M,L)
  • Black Premium Cable
  • Round Sticker

64 Audio Duo

    • Transducer Type: 2 precision drivers in a hybrid design
    • Transducer Configuration: 1 dynamic Low,  1 TIA high
    • Frequency Response: 20Hz – 20kHz
    • Sensitivity: 98dB/mW @ 1kHz @ 1mW (84mV)
    • Impedance: 9 Ω Impedance
    • Crossover: Integrated 2-way passive crossover
    • Isolation: -12dB Isolation with Apex  Core Technology
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