The F9 from FiiO 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 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 highs. The 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 phone. The 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 resonances.
