Navigation: DIY Audio Projects / Hi-Fi Audio Speaker Drivers (Transducers) / Fostex FE126En Fullrange Speaker Driver

Fostex FE126En Fullrange Speaker Driver Transducer


Fostex FE126En Fullrange Speaker Driver Transducer

This is the new Fostex FE126En fullrange driver which replaces the popular FE126E. The Fostex FE126En is a 120 mm (4.7") driver on a stamped steel frame. Like the similar FE driver the cone is made of banana plant fiber and is light weight and attached via treated cloth surround. The ferrite magnet is huge in relation to the driver, 100 mm diameter and a weight of 440 grams. The FE126En has a low Qts which makes this driver useful in horn type enclosures.

Fostex FE126En Full-range Speaker Driver

Fostex FE126En Fullrange Speaker Driver

Like many of the other inexpensive Fostex fullrange drivers, the frame of the FE126En is stamped steel. The light stamped frame is prone to "ring" so it should be improved by using duct seal to "damp" the frame. For an example of some of the modifications and tweaks one can try with the small drivers, see the modifications and tweaks for the Fostex FE103En fullrange speaker.


Thiele/Small (T/S) Parameters - Fostex FE126En Driver

The Thiele/Small Parameters from the Fostex FE126En driver datasheet are noted in the table below.

 Parameter  Fostex
Fs 83 Hz
Vas 8.5 L
Qts 0.3
Qes 0.33
Qms 4.8
Re 7.2 Ohms
Le  0.035 mH 
SPL 93 dB

Thiele/Small (T/S) Parameters - Fostex FE126En Fullrange Driver

Fostex FE126En Frequency Response and Impedance

Fostex FE126En Frequency Response and Impedance


Datasheet - Fostex FE126En


Fostex FE126En Recommended Bass Reflex Type Enclosure

Below is the Fostex Recommended Standard Bass Reflex Type Enclosure for the FE126En. The speaker box plan is from the Fostex FE126En datasheet.

Fostex FE126En Recommended Bass Reflex Enclosure

Fostex FE126En Recommended Bass Reflex Type Enclosure


Enclosure Plans and Projects Links - Fostex FE126En