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Figure 2 shows typical values for use with this double bass-reflex speaker enclosure. The whole box sounds like it is working real hard. Experiment by starting with a speaker toe-in of about degrees and adjust for best results.

Putting your ear to the port with a 40Hz tone you can hear air rushing in and out. The Fostex FEEn drivers are “fullrange” types and their main appeals is that no crossover is required. Not only do these speakers round-out the 2 channel TV end of the house but it also gives me an excellent third music listening area with quality DIY gear don’t tell the wife.

I find that the mid-range richness is why these drivers can sound good with acoustic instruments and especially vocal. The top chamber of the double bass-reflex speaker boxes is lined but not stuffed with Dacron poly fill. But if you find just the right volume the speakers can really sing. Now I’m triply happy. The stipple finish, which had fosyex with the undercoat, 206ne now built on with the top coat. Now some builders may opt to use a use a baffle step correction BSC network.

The best combination turned out to be with the BSC circuit and no grills covering the drivers. The horn speakers use the Fostex FEEn 8″ fullrange driver.

Where these drivers can sound overly forward too hot fodtex the mid-range this adjusts that forwardness leaving the bass and treble better balanced. Low frequency response from around Hz is gently damped with a controlled peak at Hz.

Last update 1 September For those who will ask, the impedance equalization circuit Zobel network for the Fostex FEEn driver shown Figure 3 can be used.

Once more Dostex went back over each surface three or more times using a semi-dry roller. The fine metal grills are held on with four 206dn earth button magnets and are easy to pop on and off. Luckily when the double bass-reflex speaker boxes arrived they had already been sanded down and that meant I only had to finish the surface preparation with a pass of fine sand paper before applying a coat of primer. The double bass-reflex speaker enclosure plan is from the datasheet that was included with the Fostex FEEn driver.


A special pair of single strand wire wrap wire speaker leads was made for 206dn speakers knowing the amp of 2.

Fostex FE206En in Double Bass-Reflex Speaker Enclosure

The circuit is simple, just one inductor and one resistor in parallel with each other and in series with the speaker. The augmentation to the bass output is achieved by the use an additional chamber in the bass-reflex process. But when it comes to flea power amps they can make “boogie” real loud. To evaluate I listened to the speakers with and without the BSC circuit, with and without the grill covers and all possible combinations in between.

Now many may find that the BSC circuit can reduce or suppress the dynamics and for that reason I don’t really like to use them. A family friend had built me the back-loaded horn speaker cabinets and at the same time a pair double bass-reflex boxes also for the Fostex FEEn driver. The bass from these speakers was always very impressive. Those who know me know that I love my flea power single-ended SE valve amplifiers.

Because these speakers are so fast and dynamic it really is a challenge to find a subwoofer that can keep up. The photos below show the Fostex FEEn fullrange speaker drivers.

I don’t have a microphone setup but using the Stereophile test CD, bass starts to roll off very slowly from about hz until you reach about 50Hz where there is a definite rise and a there is an even bigger rise at 40Hz.

Fostex FE En – Fullrange buy at

Play the volume too softy and the speakers can sound quite plain and flat – play them too loudly and they start to sound compressed and the bass lacks detail while the mid-range sounds shouty. Other advantages of the double bass-reflex speaker compared to a conventional bass-reflex system are a reduction of the cone excursion around F 3 and a corresponding reduction distortion.


With so little available power it is easy to understand why vostex loudspeakers are required. The extremely large magnet of the driver is also covered with bitumanized heavy aluminium foil to reduce sound reflections from the back of the box. Figure 1 below shows the speaker box plan fotex the datasheet. The bottom chamber of the speakers remains empty. So much so that I had to have a pair for myself. Kit, my son, had the FEEn double bass-reflex speakers in the corner of the room on a wood floor.

Created 17 September After two hours of drying time I applied the top coat to the speaker boxes. This was a satin finish in black.

What the BSC network does is to tame from the mid-range on up, without affect the lower bass response. Because of the big bass lift offered by the double bass-reflex type enclosure, test tones at 40Hz, 31Hz, 25Hz and even 20Hz are quite audible.

That seems consistent with what is described on the enclosure plan, “Internal volume of 45 liters tuned to approximately 50Hz Fb. With the circuit you also lose a little of the speakers sensitivity, which could be an issue with low power amps. You can use the online calculator to determine the value of choke and resistor required based on the width of the speaker baffle and impedance of the speaker.

The power output from these amps ranges from 2. The amount of speaker toe-in will vary dependent on the listening room, amplifier and personal preference. The advantage is that there is no crossover distortion or suppression of the dynamics which occurs with almost all passive crossover circuits.

The double bass-reflex DBR speaker system is a variation of the standard bass-reflex BR enclosure that is intended to achieve further extension of the bass response.

I rostex a dull stipple finish so reflections from the big screen TV from the sides of the speaker boxes would be minimized. See the Fostex FEEn in dual chamber box double bass reflex thread for more information or to ask any questions.