Fostex FE-103 En
FE-103 is a Fostex driver with a long history. FE-103En is one of the latest versions with the typical performance of the FE series.
This is the manufacturer's brochure
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Stamped Steel | Parameter | Measured | Datasheet | |
| Membrane material | Banana Pulp Paper | Fs | 93Hz | 83 Hz | |
| Magnet System | Ferrite | Re | 7.3 Ω | 7.5 Ω | |
| Surround | Cloth | Qms | 3.2 | 2.75 | |
| Voice Coil Diameter | 20 mm | Qes | 0.45 | 0.38 | |
| Nominal Impedance | 8 Ω | Qts | 0.39 | 0.33 | |
| Sensitivity | 89 dB/W/m | Vas | 3.4 ltr | 5.95 ltr | |
| Rated Power | 5W | Le | 0.21 mH | 0.04 mH | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
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 has a typical T/S parameters for a bassreflex applications. It can be used as an extended midrange speaker in two or three way systems with a great success
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