Stella Unites Engineering, Design, and Artistry Into a Single Instrument Built for Mastering Accuracy and Captivating Musical Emotion

A masterful collaboration between Astell&Kern and VOLK Audio
Quadbrid Driver Configuration: (1x) DD + (5x) BA + (2x) Planar + (4x) EST
Dedicated focus on tonal accuracy, phase alignment and spatial coherence
Crafted with 6061-T6 Aluminum and 9H Sapphire Crystal glass
Premium 5N LCOFC Copper, 4N Silver and 24K Gold cable with 4.4 AEC plug

AstellKern Volk Stella IEM cable attached sitting on top of AstellKern PD10 DAP on black leather table

Bloom's Take

Stella is a flagship that prioritizes balance over extremes. This Astell&Kern and VOLK Audio collaboration delivers a compact quadbrid IEM that’s surprisingly comfortable and refined for its class. Sonically, Stella avoids strict tuning labels, offering punchy yet controlled bass, a clean and natural midrange, and smooth, well-extended treble that never turns sharp. Its presentation blends technical resolution with musical ease, handling dense mixes without sounding analytical or sterile. Stella feels intentionally tuned for long listening sessions, striking a rare middle ground between precision and enjoyment.

Read our full review.

Stella

STELLA is built on a 12-driver quadbrid architecture that unites four transducer technologies 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.

LF-H VOLK Low Frequency Hybrid System

The VOLK Low-Frequency Hybrid System (LF-H) anchors STELLA’s multi-stage architecture, combining the M9-R 9 mm subwoofer with dual balanced armatures in a dual-stage chamber tuned to control phase and resonance. The chamber geometry, alignment, and crossover are co-developed to preserve phase accuracy and pressure balance. Covering 20 to 600 Hz, the LF-H forms the foundation of STELLA’s weight, control, and overall balance.

Mid-Range Architecture

STELLA’s midrange centers on a tri-armature array tuned for natural tone and balanced presence. Dual balanced-armature drivers cover 600 Hz to 7 kHz, delivering warmth, articulation, and vocal energy with added density in the critical 1–5 kHz range, seamlessly bridging the lows and highs.

A single upper armature extends from 6 to 15 kHz, reinforcing upper-mid harmonics and refining vocal and instrumental overtones. Its lightweight diaphragm and fast transients preserve clarity and texture while integrating precisely with the planar and electrostatic systems above for smooth spectral linearity.

HF-H High-Frequency Hybrid System

The VOLK High-Frequency Hybrid System (HF-H) defines STELLA’s upper range by combining MP-2 dual planar magnetic drivers with four electrostatic tweeters in a unified design. Its crossover and acoustic topology are co-engineered to preserve phase accuracy and tonal stability, allowing the planars to shape upper harmonics with control while the electrostatics extend bandwidth and atmosphere with speed and finesse.

Covering 9 to 45 kHz, the HF-H delivers coherent, ultra-high-frequency extension with authority and refinement.

AstellnKern VOLK Audio Stella IEMs exploded shell materials

Exceptional Materials

Shell
Machined from aerospace-grade 6061-T6 aluminum and anodized in satin black, the shell holds every acoustic element in precise alignment, maintaining stability between the driver assemblies and the enclosure.

Central Plate
Machined from 6061-T6 aluminum and finished in satin black, the central plate forms the visual and structural centerpiece of STELLA.

Sapphire Crystal Glass
Cut from a single block of optical-grade 9H sapphire crystal glass, the panel completes STELLA’s faceplate assembly, uniting the stainless-steel frame and central plate into a single, sealed structure.

Faceplate Frame
The frame defines the structural boundary between the sapphire glass and the aluminum chassis, machined to micron precision from stainless steel. The venting architecture built into the frame equalizes internal pressure and suppresses resonance, maintaining balance across the entire acoustic system.

Crossover Design

Stella features a proprietary six-way network that preserves phase integrity and synergy across all driver groups. Each acoustic path is filtered and time-aligned to maintain spatial coherence and tonal stability through the full frequency spectrum.

Cable Crafted for Perfection

Designed as an integral part of STELLA’s acoustic system, the cable preserves signal integrity and linearity across the full range, maintaining equilibrium between structure and sound.

AstellnKern Volk Audio Stella cable cut in half graphic

23.7 AWG, 4 Core Configuration
Hybrid Conductor Array: 5N LCOFC Copper, 4N Silver and 24K Gold
12-Strand Litz Type 4S Geometry
500D Macro-Molecular Fiber Reinforcement Core
SoftFlex PVC Insulation
Midnight Black Braided Nylon Outer Jacket
6061-T6 Anodized Black Hardware with 316 Stainless Steel Mirror Polished Accents
4.4 AEC Balanced Termination

Astell&Kern Volk Stella measurement graph

Specifications

Driver
- (1x) VOLK M9-R 9mm Dynamic driver
- (5x) Sonion Balanced Armature drivers
- (2x) VOLK MP-2 Planar Magnetic drivers
- (4x) Sonion Electrostatic drivers
Crossover: 6-way design
Frequency Response: 10Hz-45kHz
Sensitivity: 103.8 dB @ 1 kHz
Impedance: 7.17 Ω @ 1 kHz

Astell&Kern

Astell&Kern x VOLK Audio Stella | Quadbrid Universal IEMs

Astell&Kern PD20 | Digital Audio Player