Fostex FF 105 WK
Fostex new FF series has several improvements. New developed two-layer cone consists of long-fiber wooden pulp for the basic layer and short-fibred kenaf for the surface layer. The center cap has a special ridge dome shape. The cone paper, the spider and the voice coil were glued at one point for high-frequency response enhancement.
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Stamped Steel | Parameter | Measured | Datasheet | |
| Membrane material | Two Layer Paper | Fs | 79Hz | 75 Hz | |
| Magnet System | Ferrite | Re | 6.7 Ω | 6.7 Ω | |
| Surround | Cloth | Qms | 4.9 | 4.2 | |
| Voice Coil Diameter | 20 mm | Qes | 0.49 | 0.46 | |
| Nominal Impedance | 8 Ω | Qts | 0.45 | 0.41 | |
| Sensitivity | 88 dB/W/m | Vas | 3.9 ltr | 4.85 ltr | |
| Rated Power | 10W | Le | 0.06 mH | 0.041 mH | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis.
Very good off axis performance. The peak at 7500 Hz is not annoying
enough to be treated with crossover.
The second, third and fourth harmonic curves measured at 2.83V input RMS.
Burst decay response, measured at 1m on axis
The impedance curve in 18 ltr sealed box
Conclusion
This driver was designed for bassreflex applications. It can be successfully used in a Transmission Line or Onken constructions too.
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