Fostex / FF85WK

The FF-WK series is a full-range unit designed exclusively for bass reflex use, which is a complete overhaul of the previous FF series structure.

The FF-WK series employs a new ""two-layer cone"" construction, a ridged-dome aluminum alloy center cap, and a pocket neck damper to further enhance sound quality.
This delivers powerful low frequencies and characterless high frequencies while maintaining clear, realistic sound quality.

Impedance: 8 Ω
Minimum Resonance Frequency: 115 Hz
Frequency Range: f0 - 28 kHz
Output Sound Pressure Level: 86.5 dB/W (1 m)
Input Power: 15 W (Mus.)
m0: 2 g
Q0: 0.55
Effective Vibration Radius (a): 3.0 cm
Magnet Mass: 187 g
Total Mass: 0.45 kg