FiiO Snowsky OAK NANO In-Ear Monitors

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.

-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.

High-Flux Magnetic Control - Unleashed Dynamic Power - 13.8mm 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.

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
FiiOs' pursuit of perfection, they'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.

W-Shaped Independent Surround
Drawing inspiration from world-class home audio systems, the OAK NANO features a separate beryllium dome and beryllium-plated suspension design that eliminates the weaknesses of traditional diaphragms. The result is a 30% increase in effective vibration area and significantly deeper energy reserves. Experience sound that is beautifully textured and undeniably powerful.

1.5T High-Flux External Magnet Design
In a dynamic driver earphone, everything begins and ends with the driver. The OAK NANO boasts a magnetic flux density of 1.5 Tesla, significantly enhancing transduction efficiency and driver control. This high-flux environment effortlessly propels the diaphragm, resulting in a remarkably full-bodied and authoritative sound.

Specially Selected Pure Copper Voice Coil
While conventional single-driver designs often use lightweight Copper-Clad Aluminum (CCAW) to boost detail, the OAK NANO takes a more refined approach. Because our beryllium dome naturally provides an abundance of high-frequency resolution, we opted for a pure copper voice coil to balance the signature. This choice infuses the sound with a rich, mellow warmth and a smooth, organic timbre-resulting in a deeply emotive and fatigue-free listening experience.

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.

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.