Fostex FE-168 Σ
FE-168 Σ is the middle model of the legendary Sigma series. It looks exactly like the FE-208 Σ, but the size is 6".
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Vacuum Molded Aluminum Alloy | Parameter | Measured | Datasheet | |
| Membrane material | Banana Pulp Paper | Fs | 66 Hz | 60 Hz | |
| Magnet System | Ferrite | Re | 7.5 Ω | 7.6 Ω | |
| Surround | Cloth | Qms | 4.10 | 4.53 | |
| Voice Coil Diameter | 26 mm | Qes | 0.42 | 0.40 | |
| Nominal Impedance | 8 Ω | Qts | 0.38 | 0.37 | |
| Sensitivity | 94 dB/W/m | Vas | 17.3 ltr | 15.27 ltr | |
| Rated Power | 27W | Le | 0.34 mH | N/A | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
Frequency response at 1m with 2.83 V input from 0 º to 90 º off
axis with a step of 10 º, normalized at 1/3 octave.
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 differs from the other models of the series by its T/S parameters, which make it suitable for bassreflex constructions, open baffle or a top range driver in a multiway systems. It keeps the well balanced and uncolored sound signature of the "Sigmas".
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