FiiO F9 Pro Balanced IEM Headphones With Hybrid Knowles Triple-Driver Design

The FiiO F9 Pro is the new top tier balanced IEM from FiiO and the first to use a brand new triple-driver hybrid design, with each channel (L/R) is composed of one dynamic and dual balanced Knowles TWK-30017-000 armature drivers.  The 9.2mm dynamic driver is specifically tuned to produce bottomless lows while the dual Knowles drivers give precision audio image resolution.  

To cater for both balanced and unbalanced connections, the F9 Pro comes complete with both a 2.5mm balanced cable and 3.5mm phono cable which can be interchanged easily via their MMCX connectors. The 2.5mm balanced cable is made from silver-plated copper wire which ensures a balanced sound signature and a high level of detail retrieval. The 3.5mm phono cable comes with a full set of in-line controls capable of playing/pausing songs, switching tracks, volume adjustment, and even taking phone calls with its high-quality microphone. 

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 whilst attaining the required frequency response of up to 40kHz for Hi-Res Audio certification. Equally the F9 Pro has been thoroughly tested with dozens of stringent quality test, thousands of times including swing testing, wire durability testing, and temperature resistance testing.  

• Triple-driver hybrid design provides bottomless lows and clear highs 
• Includes both a 3.5mm phono cable AND 2.5mm balanced cable
  
• Top of the range Knowles TWK-30017-000 armature drivers
  

• PEK polymer nanocomposite driver for heightened detail 
• Hi-Res certified by the Japan Audio Society 
• Frequency Response: 15Hz – 40kHz 
• Impedance 28Ω 
• Sensitivity 106dB/mW 
• Max input power: 100mW