Meze Audio Astru In-Ear Monitor

ASTRU is more than an in-ear monitor; it is a statement piece: full-titanium, visceral sound, single dynamic. Simplicity raised to the highest level of performance.

It delivers a punchy, full-bodied, and rich, detailed sound – combining the layering and imaging associated with multi-driver IEMs with the tonal density and natural warmth dynamic drivers provide, all within a cohesive, unified presentation.

Embark on a journey beyond listening into a realm where music becomes palpable.

Natural and powerful, its sound is dense, immersive, and engaging, creating a realistic, impactful, and all-encompassing presentation.

ASTRU is powered by a high-performance single dynamic driver featuring a multilayer metal-coated composite diaphragm, engineered for exceptional control and refinement.

The diaphragm dome consists of an outer gold coating applied in 80 ultra-thin layers via physical vacuum DC magnetron sputtering over a 48-hour process, followed by a titanium layer bonded to a PEEK dome base. This multi-stage architecture delivers smoother high frequencies, greater extension, and more natural transient response.

The rear vent equalizes pressure between the driver's back cavity and the exterior, allowing unrestricted low-frequency driver excursion for extended sub-bass and bass output (below 200 Hz), while continuously relieving ear canal pressure for fatigue-free, long-term listening.

Lightweight yet exceptionally strong, the IEM housing is intricately CNC-machined from a single block of pure titanium into a one-piece construction, then refined through a multi-stage electroplating process to achieve a smooth satin finish that enhances wearing comfort. One matched pair of shells requires up to 7 days of processing.

Building on the ergonomic foundations set by the ADVAR and the ALBA, ASTRU maps to the natural contours of your ear with unprecedented precision - no pressure, no hotspots, only you and the music. 

The shell geometry has been refined even further: every curve finished to perfection, every surface optimized for the kind of long-term comfort that makes the shell disappear from awareness.

The included 1.2 m (3.9 ft) cable features silver-plated Linear Crystal Oxygen-Free Copper (LC-OFC) conductors arranged in a dual-strand configuration, with 161 individual conductors per strand. Insulated in SoftFlex PVC for enhanced comfort and flexibility, the cable incorporates CNC-anodized aluminum housings and a gold-plated 4.4 mm balanced termination. 

The construction is optimized for low resistance, signal integrity, long-term durability, and seamless compatibility with high-end portable sources.

The package also includes a female 4.4 mm to male 3.5 mm adapter, enabling compatibility with a wide range of DAPs and headphone amplifiers.

To fully experience the intended sound tuning, detail, and bass response, achieving a proper seal is essential. ASTRU includes five pairs of custom-made liquid silicone ear tips, engineered specifically to match its acoustic design. Using alternative ear tips may alter the sound signature and affect the intended tuning. Available in XS, S, M, L, and XL sizes.

Precisely etched from nickel and then electroplated to complement the titanium nozzle, the wax guard protects the acoustic filter from clogging, helping extend its lifespan. Functional, durable, and unmistakably Meze, it is a subtle detail that quietly safeguards every listening session.

To suit different moments in your journey, ASTRU arrives with two pouches: a sturdy pouch for secure storage and travel, and a softer PU leather envelope for a lighter, everyday carry.

Specification 

Driver Type: Dynamic
Sensitivity: 111 dB SPL/mW at 1 kHz
Driver Size: 10 mm
Input Connector: 2-pin
Frequency Range: 5 Hz - 35 kHz
Total Harmonic Distortion: <0.1% at 1 kHz
Impedance: 32 Ω
Weight: 13.4 g