Where Industrial Art Meets Acoustic Mastery

The 64 Audio x Astell&Kern XIO represents a collaborative vision between 64 Audio and Astell&Kern. Built upon a shared philosophy of sculpting sound with precision and artistry, XIO transcends traditional in-ear monitoring.

More than a playback device, it is conceived as a tangible expression of sound — a statement piece that unites advanced acoustic engineering with refined industrial design.

10-Driver Hybrid System with 4-Way Crossover

XIO features a meticulously tuned hybrid configuration incorporating ten high-performance drivers managed by a 4-way passive crossover network. This architecture ensures seamless frequency integration and tonal balance across the spectrum.

The result is a spacious soundstage with convincing depth and realism, allowing each frequency band to exist in natural proportion without overshadowing the others.

tia® Waveguide System for Airy Highs

The patented tia® (Tubeless In-Ear Audio) driver employs a direct-radiating structure that eliminates traditional sound tubes. This design reduces resonance and damping, enabling clearer, more delicate high-frequency reproduction.

A precisely positioned driver combined with a custom waveguide system enhances spatial presentation, delivering airy treble with remarkable extension and clarity.

Balanced Armature Manifold for Midrange Precision

Six balanced armature drivers reproduce the midrange, while an additional unit handles upper-mid frequencies. This manifold configuration ensures smooth transitions and natural harmonic detail.

Vocals and instruments are rendered with warmth and textural richness, preserving clarity while maintaining a cohesive and well-balanced soundstage.

TRUE ISOBARIC Dual Dynamic Drivers

For low frequencies, XIO incorporates a TRUE ISOBARIC dual dynamic driver system. Two perfectly synchronized dynamic drivers operate within a neutral acoustic coupling chamber, providing precise control and enhanced efficiency.

This structure delivers bass with exceptional depth, density, and impact — extending beyond what is typically achievable in conventional in-ear monitors.

Patented Performance Technologies

Linear Impedance Design (LID) stabilizes the interaction between the IEM and source device by compensating for nonlinear resistance across drivers. This ensures consistent tonal balance regardless of source output impedance.

tia® technology minimizes internal resonance and distortion through its tubeless architecture and single-bore design, preserving clarity and transparency.

apex® (Air Pressure Exchange) relieves air pressure within the ear canal while maintaining isolation. The included m15 module — redesigned exclusively for XIO and finished with DLC-coated 904L stainless steel — reduces listening fatigue and expands perceived soundstage width.

Precision-Milled 904L Stainless Steel Shell

The XIO housing is crafted from precision-machined 904L stainless steel, a material known for its strength and resistance to corrosion. Finished with a black Diamond-Like Carbon (DLC) coating, the shell offers both durability and a refined tactile quality.

The sculpted faceplate reflects Astell&Kern’s distinctive design language, featuring dimensional contours, subtle reflections, and architectural depth — elevating the earphone into the realm of functional art.

Silver-Plated UP-OCC Copper Litz Cable

A custom four-core cross-braided cable accompanies XIO, constructed from silver-plated single-crystal UP-OCC copper. With an ultra-low impedance of just 0.29 Ω, it promotes efficient signal transmission and excellent noise rejection.

The cable’s aesthetic integration complements the stainless steel shells, completing the harmonious blend of visual refinement and technical precision.