Free support for loudspeaker projects, sourcing OEM speaker building supplies, and passive crossover design. We sell raw speaker drivers (tweeters, woofers. Fostex FEE. new old stock, sealed. condition new. sold as Fostex FEE is a mm (“) full-range driver. The driver is well built and like. Shown is an example of a. FEE double bass reflex type enclosure. • Multiple bass reflex ports repro- duce lower frequency. • The first port is tuned ‘Fb’ to.

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Additionally, bipoles throw a huge wall of sound which can make them sound very dynamic.

The advent of home theatre has made the sub-woofer an accepted piece of kit and even a modest tweeter can give more than acceptable performance if crossed over in the k range you’d need – and the crossover can be a single capacitor. These serve different sets of user needs. The FEE has been used in a wide variety of enclosures including sealed, bass fosfex, Transmission Line and Quarter Wavelength enclosures.

Fostex FE127E Full Range Speaker

The above calculations are for inductor and fr127e values to suit the FEE driver DCR of 6R9 on the sample used and the baffle width. The table below shows a comparison of the measured results.

Figure 01 shows the calculated frequency response. The Fostex FEE is a mm 4. The fostdx is made of banana plant’s fiber and this it is very light and the driver is fast.

There is no rule to say the response has to be flat and in this instance, sounded much better with the 1 dB peak. The frame of the driver is stamped steel, so it will benefit from some damping.

Fosteex sonic character of these two speakers are different. As you can see, the parameters measured do not match very closely with those published by the manufacturer. They can be made fully aperiodic with the addition of foam plugs in the ports.



It also sounds really good. Despite the reduced efficiency, sealed designs are quite popular as they promote a smooth frequency response and excellent cone control which translates into accurate sound reproduction. It turned out really well Since we are also playing with small tube amplifiers W we wondered whether the much more efficient Fostex FEe would fit in a miniOnken-like enclosure. While these ratios may not result in aesthetically pleasing dimensions, it is best to keep the internal dimensions from being multiples of any another internal dimension.

Last update 17 December As a result, sealed box systems are typically the least efficient enclosures since half of the radiation from the driver i.

Finished versions of the miniOnken with planethifi modified drivers foshex available separately can be special ordered and flat-paks are under development. The driver is well built and like most Fostex units, it sounds excellent.

Another ratio sometimes used is 0. The frame is stamped steel so it should benefit from some damping with ductseal. The results shown below are the average of four drivers which were very closely matched.

My favourite page in Olson’s Acoustics is the one with the graphs that show the affect of box shape on diffraction and from this that a box with heavily champhered edges gets you most of the way with little effort. With a sealed enclosure, the back foatex does not interfere with the front wave because it is trapped in the sealed box.

Here the Fostex FEE fullrange driver is used in fostfx small vented bass reflex box. Many designers like to use the Golden Ratio 0.


The increased room reflections provide a good response off axis and a better sound stage i. They work well in a home theatre with subwoofer support.


See appropriate Box Plan pages. The enclosure design for this project is shown below in Drawing Even more far-out versions have been proposed 1. A diyAudio thread on a Fonken build. With wall loading within 25 mm2 dB was found to be adequate, dB was required in free space, but this speaker really needs wall loading.

This in turn results in unpleasant distortions which are present throughout the mid-range. This speaker system is suited for small to medium sized room with low to medium powered amplification.

However, I chose to go with 23L for aesthetic reasons and to allow for an easy conversion to a T-Line had I been disappointed with the sealed results. I had a lot of success with this driver in a Sealed Bipole Speaker Enclosure. A bi-amp speaker terminal was used with one set to the BSC and the other directly to the speaker.

Last update 12 July On that basis, this project uses a sealed enclosure in an attempt to get the best mid-range performance from these drivers. The near-aperiodic nature is seen in the Fonken impedance curves below — it is indicated by the small peak on the lower side of the resoance fostfx.

Last update 12 July The long ports with a very high aspect ratio naturally provide a port with high resistance. One of the major assets of an onken enclosure is the way the vents acted as a an incredibly well braced, almost fostexx layer, cabinet wall — this was the 1st thing i realized on seeing my 1st onken in an Audax project pamplet in the late 70s the design actually goes back to the Jensen UltraFlex.