You may have a better understanding if you download the demo of AJ-Horn or read the online manual from their web page http: The above enclosure is a result of a study in which I have taken this feature purely into consideration. Using an online java applet www. When you send 2 Watts your response will differ from the graph given below. Enclosure Plans [ kB pdf] note:

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The cone should be sized depending on the room acoustics, type of amplifier, preferred listening levels and personal tastes. This band is totally under the control of the enclosure but you can not get a response close to the one shown in the SPL graph.

If corner placement is not practical, wall placement will have a similar effect, only to a lesser degree. This isn’t fsotex dramatic tool which has an enormous effect on the sound, therefore you can play with it confidently. The result of the mouth placement, smooth folds and smaller footprint lead to the overall appearance of the Dalek.

A smaller chamber is used on the Dalek than many designs to control cone motion. Unlike all other Fostex drivers I have simulated FEE has a certain low frequency character which makes the design process hard from my point of view.

The FEE is an older Fostex design and no longer listed for sale but on the assumption that you might already own one which I doit is included here. If a constructor didn’t want the hassle of tuning them, they could simply build this modification into their speakers by reducing the throat width from mm internalto 80mm. This seems to be a general characteristic of rear-loading and I think you can expect fe66e with most of these drivers.


To keep the footprint to a reasonable size, I decided to make the speakers tall, as even with fe166d ordinary enclosure, it would be dead space above. We can both live with that.

Fostex FEE finished 1

For a trade off in efficiency, the FEE offers some benefits Note that with a current source, you need different values and a higher damping figure is appropriate. You can understand from that graph that, no matter how you load this Fe166w, you may not receive a certain band of frequencies. Feel free to build your own Daleks. Comparing it to the older FEE, it doesn’t extend as low in the bass but the upper mids seemed a bit smoother if less detailed. In the low frequency band of this driver, in a certain frequency band, the amplitude stays the same as you turn on the volume.

The Dalek — Fostex FEe Horn

Enclosure Plans [ kB pdf]. Looking at the Fostex enclosure again, there is actually a ‘hole’ in the response, and then some peaking, so I didn’t expect a flat response. Many software give you the simulation result of the enclosure coupled with the speaker unit, but they do not show you what will costex when you send different levels of power to the coil. Depending on your taste you can close some of them in order to fine-tune the speaker to your room or other devices you use in your system.

We were able to get marginal improvement on the top end and dramatic results on the bottom. This is my other favorite Fostex driver.

The side panels would require a little more ‘twist’, and the lower front panel would need to be modified but the remainder of the cabinet remains the same. Using an online java applet www.


Flatter overall response and less moving mass. I have tried to build this enclosure as small as possible but again it may not be the best as far as WAF is concerned it never is.

Fostex FE166e Specification Sheet

Nothing is perfect, and Horn speaker design is all about juggling with compromise, but I think the overall presentation of the Daleks is excellent.

Yes, there is a peak in the midbass, which can be smoothed with fibrous wadding in the chamber and horn throat. Like Dick’s, the EQ network looks to take some of the upper midrange out as it can get tiring over time, but you will instantly notice the 10dB improvement in the bass. Because of the high sensitivity I can say that the atackness will also stand out and will easily be driven with low powered Class A amplifiers.

When I’m being over critical about the sound, plugging in the old bass reflex speakers soon puts me straight! The consequential reduction in throat size effectively reduces horn efficiency, with a slight theoretically at least broadening of the horns effective bandwidth while maintaining correct flare.

As for the resonator. In return of this, and also by looking at the cone excursion graph, I can say that this enclosure may handle high levels of volume and keep the sound balanced.

I won’t bother babbling on about ‘impact’ and ‘dynamics’ as I reckon foatex comes with the territory of horn speakers.

Last modified: March 6, 2020