Immerse Yourself in Sound with 64Audio Duo

The Duo's twin drivers and impressive tech package are all you need to enjoy an immersive sound experience in an IEM. By pairing a dynamic driver and tia Balanced Armature with revolutionary techs like Apex Core and Wave Sync, 64Audio has produced an impressive IEM that you can enjoy anywhere, anytime.

What's In The Box?

Everything you need is included with the 64Audio Duo IEMs!

Duo Universal in-Ear Monitors
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 box and accessories laid out on white background

64Audio Duo In-Ear Monitor Technical Details

The Duo comes with proprietary 64Audio technologies for enhanced comfort and sound.

Tubeless In-Ear Audio (tia)
Air Pressure Exchange (Apex)
Linear Impedance Design (LID)
Wave Sync

All-Natural Power - 64Audio Duo IEM

Listen to the Duo for the first time, and you'll quickly notice its big natural sound courtesy of the single dynamic driver handling and the tia Balanced Armature.

Bass-heavy tracks rumble with natural impact and texture, while instrumentals and vocal-centric tracks come alive with life-like clarity and tone.

The 64Audio Duo will play back your music with extra energy that will leave you tapping your toes for hours on end.

64 audio duo side and front angled view on white wood table

Natural Sound with Unique Semi-Open Shell Design - 64Audio Duo

One of the Duo's most unique features is its semi-open back shell design, which looks amazing while offering enhanced sound.

The open design enhances in-ear comfort by venting out extra air - all while extending the soundstage for a truly immersive listening experience.

64 audio duo front and side view on wood table

Hear Pure, Unrestricted Sound with the 64Audio Duo tia Sytem

The Duo boasts a complete tia system, consisting of the tia Open Balanced Armature, Single-Bore, and Acoustic Chambers system.

These three systems allow the Duo to deliver sound from its drivers straight to your ears for unmatched clarity, detail, and tone.

64 audio duo tia acoustic chamber close up view

In-Ear Comfort Redefined - Duo Apex Core

The Duo is the first of its kind to feature Apex Core technology - a variation of 64Audio's patented Apex tech, designed to provide enhanced in-ear comfort and sound.

Derived from 64Audio's deep understanding of air movement inside an earphone, Apex Core enhances sound while ensuring minimal ear fatigue.

Air produced by the Duo's drivers is vented out naturally through the open grille design for expanded soundstage and reduced risk of in-ear pain or fatigue - perfect for long listening sessions at home or in the office.

Supremely Cohesive Sound - Wave Sync + LID Tech

The Duo features Wave Sync technology to ensure the dynamic driver and tia Balanced Armature produce perfectly matched sound

Meanwhile, LID or Linear Impedance Design technology ensures the Duo's drivers sound consistent across all frequencies no matter where you plug it in.

64 audio duo internal components outlines exploded view

Sleek Looks. Lightweight Feel - 64Audio Duo Black Premium Cable

The Duo comes with 64Audio's Black Premium Cable:

0.23 Ohms Total Impedance
7 x 7 x 4 Multi-Twist
Silver Plated OCC Copper Wire
26 AWG
Terminated in 3.5mm

64 audio duo black premium cable coiled on white wood surface

64 Audio Duo Frequency Response

The Duo covers frequencies starting from 20hz and extending to 20kHz - allowing for a wide range of frequencies to be reproduced accurately.

64Audio Duo vs U4s

Duo:

2 Drivers

20hz – 20kHz Frequency Response

9Ω Impedance @1kHz

Integrated 2-way Passive Crossover

U4s:

4 Drivers

10hz – 20kHz Frequency Response

11Ω Impedance @1kHz

Integrated 4-way Passive Crossover

Our Analysis:

The Duo is tuned to deliver strong bass rumble and impact while maintaining a smooth top-end. This IEM suits bass-centric genres like EDM, Pop, and R&B
The U4s leans more towards a warm-neutral tuning with lean detailed bass, energetic midrange, and sparkly highs. A great IEM for those looking for an engaging sound.

64Audio Nio vs Duo

Nio:

9 Drivers

10hz – 20kHz Frequency Response

6Ω Impedance @1kHz

IEMs with V-Shaped Sound Signature