The black FiiO F9 are a pair of high-resolution in-ear monitors that utilize a hybrid driver design with a single 9.2mm dynamic driver and two balanced-armature drivers, which combine to provide a frequency response of 15 Hz to 40 kHz. The F9 employ MMCX connectors and feature two interchangeable cables. The 3.5mm single-ended cable has in-line controls for playing/pausing songs, switching tracks, and volume adjustment, and there is an integrated high-quality microphone. The balanced 2.5mm cable is made from silver-plated copper wire for a balanced sound signature and a high level of detail with broad channel separation. The F9 ship with a waterproof carrying case and six pairs of ear tips.Triple Drivers for Rich SoundThe F9 utilize a hybrid design in which each channel is composed of one dynamic and two balanced-armature (BA) drivers. The 9.2mm dynamic driver is specifically tuned to produce prolific lows, while the two BA drivers precisely portray extended upper-mids and highsInterchangeable CablesThe F9 also feature standard MMCX connectors for their interchangeable 2.5mm and 3.5mm cables

The 2.5mm balanced cable is made of silver-plated copper wire, which ensures a balanced sound signature and a high level of detail retrieval. Due to its balanced nature, the left and right channel wires are separated so there is significantly greater channel separation, leading to a richer, more detailed musical experience
The 3.5mm single-ended cable comes with a full set of in-line controls capable of playing/pausing songs, switching tracks, volume adjustment, and even taking/making calls with its high-quality microphone. The F9 in-ear monitors are well suited to enhance your experience with your portable audio player or cell phoneOrganic StrengthThe ripple-like lines of the F9 not only give a unique touch, but also serve to ensure structural strength and maximize the amount of space internally for a more optimized design overall. Moreover, the inside layer of the F9's shell is specially lined with plastic to both better secure the drivers and eliminate internal resonancesPEK Polymer Nanocomposite Driver for Heightened DetailThe F9 utilize a dynamic driver made of polyether ketone (PEK) polymer nanocomposite, which is not only known for being tough, but also light. The PEK diaphragm offers solid sound reproduction with less sound loss and lower distortion when compared to other material, such as beryllium alloy or titanium alloyScientifically Tuned for Maximum PerformanceAll three drivers work in harmony to produce a cohesive sound that reproduces every part of the frequency spectrum from 15 Hz to 40 kHz
The F9 have been certified by the Japan Audio Society to be "Hi-Res Audio" capable for a life-like listening experienceIncluded AccessoriesWaterproof carrying case
Six pairs of silicone ear tips (2 types)

Type 1: Optimized for bass (S, M, L)
Type 2: Optimized for a more balanced presentation (S, M, L)

Single-ended (3.5mm) cable with in-line controls
Balanced (2.5mm) cable