Magnalium diaphragm DLC gasket driver With the FD15, we are sincerely bringing you into a new realm of sound. The all-new FIIO FD15, as the successor to the FIIO FD5, introduces a truly high-end driver design - a magnalium diaphragm DLC gasket driver. By innovatively combining these two materials, not only does the FD15 deliver a spacious and relaxed natural sound, but it does so while achieving new heights in the reproduction of musical detail for truly transparent sound. Magnalium diaphragm – a scientifically calculated blend of magnesium and aluminium that features high hardness and low distortion when moved for a clear, detailed treble. DLC gasket – DLC diamond-like carbon is known for being both rigid yet flexible, which means less breakup during movement and ultimately higher-quality sound. W-shaped gasket FiiO ‘s pursuit of acoustic excellence knows no bounds. The FD15 boldly embraces high-end audio design principles by introducing the W-shaped gasket design to earphones. Compared to conventional diaphragms of the same size, the FD15 boasts a 30% increase in effective vibrating area. With a larger effective diaphragm area and greater amplitude, the core acoustic unit can store more sound energy., delivering a denser and more sold listening experience. Mid-range vocals, Simply purely good Quality materials yield quality sound, and HiFi is no exception to this principle. The FD15 features a thoroughly refined mid-range, with genuine innovation in the usage of materials and new technologies. Once again, we strive to adhere to the philosophy of simply providing great, pure sound. Large 13.8mm dynamic driver The FD15 explores higher levels of core audio performance by increasing the diameter of the dynamic driver to and astonishing 13.8mm. Compared to its predecessor, the FD5, this results in an increase in effective diaphragm area of approximately 40%. Moreover, the larger the dynamic driver, the more air it can push through, thereby improving the efficiency of electroacoustic conversation at its source. This enhancement elevates the overall quality and scale, allowing mid-frequency vocals to feel as if they are right next to the ear. Φ8.6mm long voice coil Based on professional design principles, the voice coil diameter of the FD15 has been increased from FD5’s Φ6.2mm to Φ8.6mm. The longer voice coil copper wire directly enhances efficiency and power capacity, resulting in improved transients. The result is a cleaner, more natural sound that fully allows you to fully appreciate its charming mids. 1.5T external magnet design The driver structure is of course one of the most important parts of a dynamic driver earphone. The FD15 draws inspiration from innovative acoustic concepts and adopts a powerful external magnet design. The magnet volume has increased by about 69.5%, and the magnetic flux can reach up to 1.5T. This abundant and uniform energy supply ensures that this high-end driver consistently works well. Deeper bass, for an emotionally deeper experience - “Tesla Valve” patented bass enhancement acoustic design Inspiring new acoustic thinking, with special attention to immersive bass. The FIIO FD15 takes the lead by incorporating the F.T.B.S. ‘Tesla Valve’ patented bass enhancement acoustic design. Thanks to the high-precision powder metallurgy process used in creating the FD15, the length, angle, and quantity of channels within the earphone cavity are specially calculated to achieve a Tesla valve fluid structure that significantly enhances bass extension. Experience truly deep yet detailed bass. Greatly detailed for a truly high-end listening experience - Frontal acoustic prism Within the FD15 is a frontal acoustic prism, which not only retains the widely acclaimed vocals from the FD5 but also helps to adaptively adjust the all-new driver and enhances high-frequency diffusion. Specifically, engineers have added a specially designed acoustic filtering device at the front of the driver. When sound waves pass through, this acoustic device effectively addresses the subtle sound delay caused by different sound wave paths, achieving adaptive phase consistency and thus precise control over sound waves. 316L stainless steel shell - High-end quality without the high-end price Silver light flashes by, swift as a shooting star. The FIIO FD15 creatively combines a fresh design language with a closed-back acoustic design, utilizing carefully placed design surfaces flourishes to create an elegant and ever-changing play of light and shadow. To achieve this effect, the FD15 is made with 316L medical-grade stainless steel, which thanks to powder metallurgy sintering means the IEM is durable. It further undergoes meticulous hand-polishing and PVD electroplating for a premium finish, for a mirror-like visual sensation. Let its texture emotionally resonate with you. Visibly great, audible awesome Cut through the markups and get access to affordable ...