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Fostex FE206E Fullrange Speaker Driver

Fostex FE206E Fullrange Driver

Note - this driver has been discontinued and is no longer being produced. The Fostex FE206En can be used as a replacement driver. The FE206E is the largest of the Fostex fullrange driver line at 200 mm (8"). The FE206E is a good choice if you are looking for more or louder bass than the smaller Fostex "FE" drivers. Being the biggest of the bunch, the FE206E can handle more power, has a larger Xmax (excursion) and is more efficient than it's smaller brothers. The paper cone and whizzer are constructed from banana plant fiber, which makes for a very light cone.

Fostex FE206E Full-range Speaker Driver
Photograph 1: Fostex FE206E Fullrange Speaker Driver

The frame is stamped steel and there are benefits to damping it in order to reduce the potential of having the chassis "ring". This can be done using ductseal or adhesive bitumen damping material. It may also a good idea to cover the surface of the large magnet with upholsters felt which could act like a hard reflective surface in the enclosure. See the Fostex FE206E / FE206En fullrange driver modifications and tweaks page for an example.

T/S Parameter Measurements - Fostex FE206E

The Thiele/Small Parameters of the Fostex FE206E drivers have been measured using the Dayton Audio Woofer Tester 3 (WT3). The results shown in Table 1 below are the average of two drivers which were closely matched. The measured parameters are pretty close with those published by the manufacturer. The table below shows a comparison of the measured results. The measurements were made at about 22 degrees Celsius.

 Parameter   Manufacturer  WT31
Fs 39 Hz 39.03 Hz
Vas 54.53 L 79.9 L
Qts 0.18 0.24
Qes 0.18 0.26
Qms 3.73 3.89
Re 6.69 Ohms  6.82 Ohms 
Le n/a 0.33 mH
SPL 96 dB 94.6 dB

T/S Parameters - Fostex FE206E Driver

  1 - Average of 2 drivers using Dayton Audio Woofer Tester 3

Datasheet - Fostex FE206E Speaker

Enclosure Plans and Projects Links - Fostex FE206E