The FT3 features a large 60mm dynamic drivers, uncommon in its class. Compared to a smaller drivers, the FT3 can push more air and convert energy into the sound more efficiently – resulting in a more natural yet robust sound with an expansive soundstage. Due to its large size, the diaphragm is capable of bearing higher output power, leading to less distortion under large dynamic signals. Also, the larger driver is more easily able to produce lower frequencies for deeper reaching bass.

After countless testing at FiiO, a beryllium-plated gasket + DLC diaphragm was chosen. This not only results in a lighter gasket (and thus a lighter driver), but also a more rigid gasket better able to handle the movement of the large dynamic driver for less distortion. The diaphragm of the FT3 is made of DLC (Diamond-Like Carbon) – which is both highly sturdy and lightweight compared to other diaphragm materials.