1-Year Local Warranty.

CLARUS is Astell&Kern's new flagship in-ear monitor.

built on a precisely harmonised 9-driver tribrid architecture. With a proprietary six-way crossover and a precision-machined aluminium housing working as one; it delivers pure, high-resolution sound with detail and balance across the entire frequency range.

CLARUS unites three transducer technologies and a precision-machined housing into one coherent system:

• 9-driver tribrid architecture: 1 dynamic driver, 7 balanced armatures, 1 MEMS tweeter
• Three coordinated acoustic systems
• Silicon MEMS tweeter delivering semiconductor-level speed and precision in the highs
• Six-way crossover preserving phase and tonal coherence
• CNC-machined aerospace-grade 6061-T6 aluminium housing
• Multi-faceted faceplate finished with the Astell&Kern insignia
• AK × Effect Audio custom cable
• AK × AZLA SE2000 ear tips in six sizes

A sound as clear and brilliant as starlight

Following Zero1, Zero2, and Luna, CLARUS is Astell&Kern's fourth flagship in-ear monitor, and our finest yet. Every product we make begins with a single belief: that sound should be heard exactly as it was meant to be.

From the arrangement of every driver to the final voicing, CLARUS was engineered and tuned to that belief. It was developed and voiced on Astell&Kern reference systems, and tuned together with our flagship SP4000T player, so that what you hear is the true spirit of Astell&Kern.

Named after the star in "Astell," CLARUS was voiced to shine with the same quality a star does — clear, pure, and unwavering. Rather than highlighting one frequency or enhancing another, CLARUS delivers natural clarity evenly across the entire spectrum. It doesn't colour the music or draw attention to specific details—it simply lets the recording speak for itself, allowing you to experience the Astell&Kern sound in its purest, most luminous form.

• 9-Driver Tribrid
• 6-Way Crossover Network
• 3 Coordinated Acoustic Systems

CLARUS is built on a precisely harmonised 9-driver tribrid architecture that combines a proprietary dynamic driver, seven Sonion balanced armatures, and a silicon MEMS tweeter within a single, coherent system.

Each element was developed for its distinct role and tuned through precise control of phase, pressure, and motion.

Its design reflects the same discipline that governs its form. Every contour, cavity, and circuit exists to serve acoustic integrity. The structure is shaped by performance, the performance defined by structure. Nothing is decorative, nothing is redundant.

Every driver operates within its natural range, contributing its character without interference. No forced equalisation. No artificial enhancement. Only precision through purpose.

Technical Version

1. Low-Frequency System | Proprietary 9 mm Dynamic Driver + Dual Sonion Balanced Armatures

2. Midrange Array | Three Sonion Balanced Armatures

3. High-Frequency System | Silicon MEMS Tweeter + Dual Sonion Balanced Armatures

4. 0.78 2-pin Connector

5. 6061-T6 Aluminium Shell | Anodised Silver

6. Multi-Faceted Faceplate | CNC-Machined 6061-T6 Aluminium, Anodised Silver

Acoustic Architecture

Low-Frequency System: Proprietary 9 mm Dynamic Driver + Dual Sonion Balanced Armatures

Midrange Array: Three Sonion Balanced Armatures

High-Frequency System: Silicon MEMS Tweeter + Dual Sonion Balanced Armatures

6-Way Crossover Network controlling the full 9-driver tribrid architecture

LOW-FREQUENCY SYSTEM (20 Hz – 500 Hz)

Bass and lower midrange are driven by a three-driver hybrid low-frequency system, combining a proprietary 9 mm dynamic driver with a dual Sonion balanced armature array.

The 9 mm dynamic driver operates from 20–200 Hz, delivering sub-bass depth, extension, and natural physical weight. The dual Sonion armature array operates from 80–500 Hz, reinforcing speed, articulation, and structural definition through the upper bass and lower midrange.

All three drivers are housed within a shared pressure-coupled chamber, allowing air movement, acoustic pressure, and crossover behaviour to be controlled as one integrated low-frequency system.

MIDRANGE ARRAY (500 Hz – 7 kHz)

Core midrange and presence are handled by a three-driver Sonion balanced armature array, tuned for tonal balance and natural presence.

A dual Sonion midrange armature operates from 500 Hz to 2 kHz, shaping vocal body, tonal density, and natural midrange weight.

A dedicated Sonion balanced armature operates from 800 Hz to 7 kHz, extending clarity, harmonic structure, and presence-region definition. Together, the midrange array maintains continuity from lower mids into upper mids, preserving vocal placement, instrumental separation, and articulation through the center of the frequency range.

HIGH-FREQUENCY SYSTEM (7 kHz – 20 kHz)

The high-frequency system pairs a top-firing silicon MEMS tweeter with two Sonion high-frequency balanced armatures, creating a hybrid treble section designed for speed, output, and extension.

Within CLARUS, the MEMS tweeter operates from 7–10 kHz, bringing semiconductor-level precision to the upper registers. Its monolithic silicon structure delivers exceptional speed, phase stability, and part-to-part consistency, producing fine detail with a level of focus and control beyond conventional driver designs.

The paired Sonion high-frequency armatures operate from 9–15 kHz, with response extending to 20 kHz, reinforcing treble output, air, intelligibility, and spatial extension while maintaining low distortion across the upper registers.

Material-Design Engineering

SHELL

CLARUS features a CNC-machined shell crafted from aerospace-grade 6061-T6 aluminium and finished in anodised silver. The main body follows an organic ergonomic form, shaped for natural fit and stable contact within the ear.

Its geometry is engineered for stiffness and resonance control, and the housing is defined by precision machining, structural integrity, and a clean industrial form. The alloy’s low density provides comfort while preserving strength and balance.

FACEPLATE

The shell transitions into a multi-faceted faceplate, where precision-cut planes create depth, contrast, and controlled reflection across the surface.

The anodised silver finish emphasises the material character of the aluminium, highlighting the sharp geometry of the faceplate and the smooth curvature of the shell.

Every edge, radius, and transition was modelled to direct light and form as one continuous surface.

ERGONOMIC FORM

The shell follows an organic ergonomic form, sculpted for natural fit and stable contact within the ear. Every curve transitions smoothly from the faceted faceplate into the body of the housing.

Machined to precise tolerances, the form balances comfort, isolation, and structural integrity, completing CLARUS as a single continuous industrial statement.

SIX-WAY CROSSOVER

A proprietary six-way crossover network controls the entire tribrid architecture, assigning each driver group a defined operating range within the system.

Each acoustic path is independently filtered and integrated to manage the interaction between the dynamic driver, balanced armatures, and MEMS tweeter. This allows the system to preserve timing, phase behaviour, and tonal continuity across overlapping frequency regions.

The result is a 9-driver tribrid architecture that performs as a single acoustic framework rather than a collection of separate driver technologies.

PREMIUM COMPONENTS — CABLE

Astell&Kern × Effect Audio

Astell&Kern × Effect Audio Cable

The cable included with CLARUS is a branded premium product — a custom-spec Effect Audio Ares S Lite, from one of the world’s leading specialists in high-end IEM cables.

• UP-OCC pure copper Litz conductors
• 24 AWG, four-wire dual geometric design
• 0.78 mm 2-pin connector

PREMIUM COMPONENTS — EAR TIPS

AK × AZLA

SednaEarfit SE2000 Ear Tips

The ear tips included with CLARUS are AZLA SednaEarfit SE2000 — made of KCC medical-grade silicone and offered in a full range of six sizes for an optimal, secure fit.

SE2000 is the standard ear-tip series provided with our earphones, maintaining the same KCC medical-grade silicone and a full range of detailed sizes including the standard fit.

Components

• CLARUS Earbud L/R
• AK × Effect Audio Cable (custom-spec Ares S Lite; 0.78 mm 2-pin)
• AK × AZLA SE2000 Ear Tips — 6 sizes (SS / S / MS / M / ML / L)
• IEM Pouch
• Cable Holder
• CLARUS Saffiano Leather Case x1

Specification

General Specifications

Driver:

• 1 × Proprietary 9 mm Dynamic Driver
• 7 × Sonion Balanced Armature Drivers
• 1 × Silicon MEMS Tweeter

Cable:

• AK × Effect Audio Cable (custom-spec Ares S Lite)
• UP-OCC Pure Copper Litz Conductors, 24 AWG 4-Wire
• 0.78 mm 2-Pin Connector / Termination: TBC

Materials & Finish:

• 6061-T6 Aluminium CNC Chassis, Anodised Silver
• Multi-Faceted Faceplate, CNC-Machined 6061-T6 Aluminium, Anodised Silver

Components

Clarus Earbuds, AK × Effect Audio Cable, AK × AZLA SE2000 Tips, Saffiano Case

Frequency Response: 20 Hz – 20 kHz

Sensitivity: 103.9 dB SPL @ 1 kHz

Impedance: 9.7 Ω @ 1 kHz