FiiO FX15 Grey Ear Loop headphones

The FiiO brand has years of experience in designing and developing premium audio devices. FiiO has designed the latest FX15 with a unique six-driver hybrid configuration that promises high-end sound to its users. The pair consists of a dedicated 10mm DLC dome dynamic driver for a powerful bottom end, a Knowles midrange/treble driver unit and four Sonion EST tweeter driver units. The drivers work together to produce a truly high-resolution sound output.
The FiiO FX15 is FiiO's first implementation of high-resolution electrostatic drivers in IEMs. The brand has collaborated with SONION, one of the leading brands in the industry, to deliver high-quality and high-performance electrostatic driver units. Using four EST drivers on each side, the FiiO FX15 delivers a hugely detailed high frequency band.
The EST drivers are arranged here to enhance high-frequency extension and provide users with impressive high-frequency resolution. The pair features a switch that allows users to easily turn the EST drivers on and off.
To enhance the low frequency response produced by the dynamic driver unit, FiiO has equipped the pair with its patented S.Turbo acoustic design architecture. It incorporates an ultra-thin and long acoustic tube that significantly improves the pair's bass response.