Although in the panorama of high-end IEMs, the electrostatic structure is not new, it is the first time that FiiO has launched headphones with these characteristics on the market. 

In search of maximum sound detail, these advanced range in-ears stand out for mounting a structure of six drivers led by four electrostatic units, one dynamic and another BA. With its S.Turbo technology and the rest of its components, among which its premium cable stands out, the FX15 are FiiO's most successful launch, and above all, the first of many in-ears with detail at the purest electrostatic level.

The electrostatic drivers stand out for the reproduction of details at high frequencies.

The FiiO FX15employs 4 electrostatic driversper channel that not only provide exceptional ultra-high frequency extension, but are also exceptionally fast and capable of reproducing every last detail of music.

The FiiO FX15 adopts the BA armature driver, with mid and high frequency ranges, due to the smooth, lush and detailed sound. The R&D team has also reduced the sensitivity of the driver so that the rest of the drivers can operate in harmony, and together, achieve especially detailed audio. 

The FiiO FX15 also mounts a 10mm DLC dynamic driver, chosen for its high rigidity and high damping coefficient to offer a robust and full sound. To achieve harmony between the dynamic, BA and electrostatic drivers, the R&D team has redesigned the structure of the dynamic driver, resulting in a coherent sound from the bass to the ultra-high frequencies in the frequency response curve of the FX15. 

The FX15 Tribid employs a patented S.Turbo acoustic design to maximize bass performance. At the heart of this system, there is an elongated low-frequency sound tube that effectively filters out high frequencies produced by the dynamic driver. 

In turn, these FiiO FX15 are capable of reproducing sound frequencies higher than 15 kHz. To visually represent their capabilities, these IEMs feature a design that embodies the spirit of "sound and form" working together in harmony. 

In collaboration with HeyGears, FiiO has created a shell to offer excellent comfort and durability. This design is based on an advanced DLP-3D printing method, with a precision of 0.0375mm, ensuring that each FX15 enclosure is precisely molded to ensure sound quality between each unit manufactured. In addition, this case is made of photosensitive resin, featuring high impact resistance for solid protection.

Through repeated measurements and wear tests, FiiO engineers optimized the shape of the FX15, which is a triangle that in addition to feeling comfortable in use, remains secure in the listener's ear, to achieve the balance between comfort and stability. 

Another of the strong points of the FiiO FX15 is its high purity cable with 224 wires in total separated into 8 wires of 28 wires each. 

Each wire is independently insulated with Litz braiding. The outer case is made of TPU to make the cable look more vivid and transparent, as well as protected. 

• 1 x Manual
• 1 x Carrying case
• 1 x Silver cable with interchangeable plug
• 3 x pairs of "vocal" ear tips (S/M/L)
• 3 x pairs of "bass" ear tips (S/M/L)
• 2 x pairs of double flange ear tips (M)
• 2 x pairs of foam ear tips (M)
• 3 x pairs of balanced ear tips (S/M/L)
• 1 x magnetic clip
• 1 x cleaning brush
• 1 x MMCX quick release tool
• 1 x interchangeable 3.5mm and 4.4mm plugs
• 3 x SpinFit pads (S/M/L)
• 3 x HS18 pads (S/M/L)