FiiO OAK NANO

Beryllium metal driver | Pure titanium CNC-machined shell

Cryo-treated silver-plated monocrystalline copper cable

13.8mm external magnet dynamic driver

W-shaped diaphragm with independent surround

Acoustic Prism front chamber

Airflow-controlled damped rear chamber

Dual swappable tuning nozzles

Includes 3.5mm/4.4mm/TC swappable plugs

0.78mm 2-pin detachable cable

*Pictures are for reference only, actual product may vary.

Selling  points

Supreme elegance.

A new movement in sound.

The story of the OAK Series

The new OAK Series was inspired by classic wristwatch aesthetics. We celebrate the watchmaker’s quest for the absolute, translating that dedication into rock-solid build quality and an elegance that never fades. Where sound meets light, individuality and sophistication take center stage.

OAK NANO is the first of the OAK Series, the spiritual successor to the FIIO FD7, and SNOWSKY's first flagship product. The OAK NANO was created through two years of research and development—a journey of unceasing refinement in pursuit of watch-grade craftsmanship and exceptional sonic character. The engineering team chose beryllium metal for the diaphragm—the same precious material found in the FD7. Its rare combination of lightness and rigidity yields a distinctively clear and open sonic character. Together with a suite of sophisticated acoustic innovations, OAK NANO turns every listening session into a premium auditory indulgence.

Superior materials Sublime fidelity

Beryllium alloy dome diaphragm

Inheriting the acoustic DNA of the legendary FIIO FD7, the OAK NANO continues the legacy of beryllium-based diaphragms while charting a new path. Beryllium as a driver material is ultra-lightweight, exceptionally rigid, and superior to aluminum or titanium. Its low damping and high sonic velocity ensure zero unwanted coloration, making it the premier choice for high-end audio. While global supply chains have made pure beryllium increasingly rare, the OAK NANO utilizes a specialized beryllium alloy that mirrors the performance and sonic characteristics of the pure metal. We have pushed the boundaries of precision engineering to reduce the diaphragm's thickness, further unleashing the material’s potential. This significantly enhances high-frequency extension, transient response, and distortion control, allowing for the precise restoration of micro-details—from the crisp strike of percussion to the delicate nuances present in vocals.

Noble refinement Timeless elegance

Pure titanium shell

The OAK NANO utilizes pure titanium—prized for its density and hardness—to create a body that remains pristine through the passage of time. Through a series of demanding and precision manufacturing processes—including mirror polishing, CNC machining, and PVD coating—its distinctive design language is brought to life, allowing the earphone's unique color, luster, and sharp contours to emerge with striking clarity.

Reimagining the conductor

The next level of sonic purity

-192°C liquid nitrogen

cryo-treated silver-plated

monocrystalline copper cable

We select 6N OCC (99.99998% pure) monocrystalline copper as our base material. This ultra-high purity conductor is inherently free of grain boundaries, offering exceptionally low resistance and high conductivity while eliminating oxygen and hydrogen impurities that degrade signal integrity. To push electrical performance to the absolute limit, every conductor undergoes 100+ hours of deep cryogenic treatment. At -192°C, internal stresses within the metal are significantly released, thereby optimizing the microstructure. This internal restructuring facilitates a smoother and more natural transmission of audio signals.

-192°C for 100+ hours

Deep cryogenic liquid nitrogen treatment

99.99998% purity

6N monocrystalline copper

High-flux magnetic control  Unleashed dynamic power

13.8mm external magnet dynamic driver

Building on the legacy of the FD7, OAK NANO steps up to a larger 13.8mm driver unit with an enlarged and thickened magnet to match. A larger magnet means a stronger and more stable magnetic field. Lab testing confirms that magnetic flux density within the voice coil gap reaches nearly 1.5T, with distortion as low as 0.1% even at 114dB SPL. This immense magnetic force provides the raw driving power necessary for greater amplitude and minimal vibration distortion, resulting in superior transient response.

As low as 0.1%​​​​​​​Distortion

Increased by 69.5%

Magnet volume

Increased to 13.8mm

Driver size

Custom-engineered Excellence in every detail

Advanced dynamic driver design

Designed around the acoustic characteristics of a single dynamic driver, we spared no effort in refining OAK NANO's diaphragm, magnetic drive, and voice coil—each detail a deliberate step toward higher performance and a more fully realized sound.

Lighter, Stronger Beryllium Dome

In our pursuit of perfection, we’ve achieved the impossible: a larger beryllium dome that is also significantly thinner. Paired with our newly engineered, high-flux magnetic circuit, the OAK NANO achieves lightning-fast transient response and breathtaking treble extension.

Precision correction Keeping sound on track

Front chamber Acoustic Prism system

The OAK NANO utilizes an advanced Acoustic Prism to ensure your music stays "on track." This technology, proven in the acclaimed FD7, corrects the phase of sound waves as they travel through the chamber. By resolving time-lag and standing wave distortion, it allows for superior control over every frequency for a more refined sound.

Precision airflow control Transformed mids and bass

Airflow-controlled damped rear chamber

Utilizing micro-precision CNC machining, a high-density acoustic damping mesh is integrated into the rear chamber vents of the OAK NANO to regulate internal airflow. This specialized damping effectively suppresses resonance, resulting in deeper and more authoritative bass. The midrange benefits equally, with vocal body and density in the 100Hz–4kHz range noticeably enriched. The result is that the mids and bass are fuller and more satisfying across the board.

Red Nozzle — Master of atmosphere. Deep, authoritative low-end with a powerful sense of scale. Perfect for pop, rock, and folk.

Dual sound signatures Unlock a fresh sound anytime

Dual swappable tuning nozzles

The OAK NANO features swappable tuning nozzles, including both red and black acoustic filters to offer expanded tuning possibilities. Each tuning nozzle features differing densities of damping material to provide a total of two distinct sound profiles to match your personal listening preferences.

Black Nozzle — Precisely detailed. Crystalline transparency with bright, detailed high-end extension. Perfect for classical and instrumental music.

*Test data from FIIO Acoustic Labs

Seamless compatibility Built around your needs

Detachable cable and swappable plugs

The OAK NANO is engineered for ultimate flexibility. With a fully detachable cable and a swappable plug system, it adapts effortlessly to any listening environment. Included are three interchangeable connectors to cover all your devices. Notable is the Type-C plug, which unlocks a rich suite of real-time tuning options—giving you the power of multiple setups in a single device.

0.78mm 2-pin Detachable Cable

This widely used connector offers vast compatibility with a wide array of aftermarket cables. The robust dual-pin architecture ensures a secure fit, providing a rock-solid connection for a stable and uninterrupted signal path.

8-Band Precision PEQ

The Type-C plug houses a BES3001-SP DSP audio decoding chip with balanced output, supporting 32-bit/384kHz PCM hi-res audio decoding alongside 8-band precision PEQ tuning. Powered by FIIO's proprietary algorithm and accessible through the FIIO Control app or web interface, users can adjust, export, and save custom audio curves with ease.

3 Swappable Plugs

Premium accessories Exceptional standards

22 eartips and custom carrying case

True to our commitment to going above and beyond, OAK NANO comes standard with 22 pairs of eartips in a variety of styles, along with a newly designed carrying case. Everything you need, right out of the box—no afterthoughts required.

22 Pairs 3 Distinct Eartip Styles

*Please see the accessories list for details on included eartiips.

The gold standard of fidelity

Officially recognized

Hi-Res Audio certified

OAK NANO has passed the high-fidelity audio certification standards set by the Japan Audio Society and the Consumer Electronics Association—a trusted mark of quality that speaks to its faithful, true-to-source sound reproduction.

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Basic specifications