We achieved maximum performance from the F9 PRO's drivers by looking to the laws and principles of physics and psychoacoustics when designing our product. By doing so, the drivers are able to work in perfect harmony to achieve a cohesive sound that is absolutely able to reproduce every part of the sound frequency spectrum – allowing for a frequency response from 15 Hz to 40 kHz.
Scientifically Tuned based on Physics and Psychoacoustics
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. Of course, due to its balanced nature, the left and right channel wires are separated so that there is significantly greater channel separation - leading to a richer, more detailed musical experience.
Hi-Res Audio Certification
The F9 PRO has been certified by the Japan Audio Society to be "Hi-Res Audio" capable. This means that the F9 PRO is capable of a frequency response up to 40kHz, which can fully reproduce the audio and give you a natural and life-like listening experience that truly lets you listen to the music the way the artists wanted it to sound.
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 calls with its high-quality microphone. This makes the F9 PRO a perfect complement to enhance your experience with your portable audio player or cell phone.
The F9 PRO's outer aluminum shell is meticulously crafted using CNC systems – impressive already, but it doesn't stop there. The shells are then carefully hand-polished and matched, before going through sandblasting and anodization. This complex overall process ensures that the F9 PRO has a masculine, robust shell that is yet encapsulated in a tender beauty.
The F9 PRO utilizes the standard MMCX connector for its interchangeable cables, and comes standard with both 2.5mm balanced and 3.5mm single-ended cables.
Freely switch between balanced and single-ended with standard MMCX connectors
The F9 PRO utilizes a dynamic driver made of PEK (polyether ketone) polymer nanocomposite, known for not only being tough but also being light. This allows the F9 PRO's dynamic driver to be highly capable of producing quick, detailed, and extended bass.
PEK polymer nanocomposite driver for heightened detail
1 Dynamic Driver & 2 Balanced Armatures for Triple helpings of rich sound
The F9 PRO utilizes 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 bottomless lows while the two BA drivers utilizing the American brand knowles' 30017, which precisely portray extended upper-mids and highs.
You would never imagine that such a grand sound could come from something as tiny as the F9 PRO. Due to the way we have cleverly packaged the naturally-detailed BA drivers and the traditionally vast-sounding dynamic driver, we have achieved a fully cohesive sound that you would normally not think is possible from a puny in-ear monitor.
Colossal Energy from a Tiny Body
The end of the MMCX cable's left channel is adorned with a splash of blue, while the end of the right channel is trimmed with a touch of red – for easy identification of the audio channels in a subtly stylish way. These channel ends also have a spiral texture engraved into them, for just the right amount of friction to greatly aid in removing and replacing the cable.
Colors and texture for easy identification and replacement
Besides the 2.5mm balanced and 3.5mm single-ended cables, the F9 PRO comes with a whole host of other accessories all designed to tailor and safeguard your listening experience. For instance, the F9 PRO comes with three different kinds of silicone ear tips, each designed for a particular sound signature and coming in small, medium, and large sizes. Also included with the F9 PRO are three pairs of foam eartips, all in the same one-fits-all size.The color of the ear tips is even matched to the color of your F9 PRO unit! We give you control over your listening experience, so you can listen however you want, whenever you want. The F9 PRO also comes with our popular waterproof carrying case, as well as a water-resistant neoprene carrying pouch, so you can be rest assured that your earphones will continue to function for years to come.
Unexpectedly Thoughtful Accessories
The ripple-like lines on the F9 PRO not only give it 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 PRO's shell is specially lined with plastic to both better secure the drivers and eliminate internal resonances.