FiiO has crafted the FD11's 10mm dynamic driver from the same materials used in the FH15 and FF5 IEMs. The FD11 gets a significant boost in its sonic capabilities from this high-quality dynamic driver. It features a dual-cavity design and a carbon-based diaphragm material. This gives the pair a very responsive sound with smooth timbre and minimal distortion.
FiiO has equipped the FD11 with second-generation asymmetrical internal and external magnetic circuits. The pair was developed using finite element simulations that optimise the design of the magnetic circuit to produce a strong and powerful magnetic field. The result is a higher magnetic field density that allows for switching movement of the diaphragm and promises high-quality sound reproduction.
The FiiO FD11 is designed with the brand's ultimate craftsmanship. The pair features high-quality zinc alloy material shells that are decanted into the mould and then polished and electroplated to treat users with an exquisite finished product. It has a conch-like shape. The pair has an ergonomic shape that promises a comfortable feel for users.