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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See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example. With a sealed enclosure, the back wave does not interfere with the front wave because it is trapped in the sealed box.

The increased room reflections provide a good response off fsotex and a better sound stage i. A bi-amp speaker terminal was used with one set to the BSC and the other directly to the speaker. The driver is well built and like most Fostex units, it sounds excellent. The sonic character of these two speakers are different. The box structure is quite inert to box-wall resonance induced colourations.

Pushing these tiny X max drivers to produce bass tends to cause some loss of cone control, even at low SPL.

Fostex FEE Fullrange Loudspeaker Driver

There is no rule to say the response has to be flat and in this instance, sounded costex better with the 1 dB peak. On that basis, this project uses a sealed enclosure in an attempt to get the best mid-range performance from these drivers.

These serve different sets of user needs. 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.

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. The enclosure design for this project is shown below in Drawing 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. The advent of home theatre has made the sub-woofer an accepted piece of kit and even fosteex 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.


The frame is stamped steel so it should benefit from some damping with ductseal. One of the major assets of an onken enclosure is the way the vents acted as a an incredibly well braced, almost constrained 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. Plans linked are freely available for non-commercial use only.

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 fe127r effort. This speaker system is suited for small to medium sized room with low to medium powered amplification.

The above calculations are for inductor and resistor values to suit the FEE driver DCR of 6R9 on the sample used and the baffle width. With wall loading within 25 mm2 dB was fe172e to be adequate, dB was required in free space, but this speaker really needs wall loading.

EOS Electronics | Proffesional Audio | Fullrange | Fostex FE Fullrange Loudspeaker

Another positive characteristic of a bipole system is that the rear driver compensates for the baffle diffraction stepand thus no electronic correction circuit is required. Bipole speakers do an excellent job of propagating sound out to the sides and they create a lot of room reflection as well as a direct radiation toward the listener. The cone is made of banana plant’s fiber and this it is very light and the driver is fast. The table below shows a comparison of the measured results.

The frame of the driver is stamped steel, so it will benefit from some damping. Because of its very flat frequency response it makes a good small control monitor for music or video editing.


It is magnetically shielded for use near television or CRT monitor. A diyAudio thread on a Fonken fe1227e. This is accomplished by the use of small panels no box wall has a greater unbraced panel span than 5″ mmthe use of relatively thin, light, and stiff baltic birch plywood, and the driver braced against a large portion of the mass of the box panel to spread that energy as thin as possible.

Fostex FE127E Specifications

Many designers like to use the Golden Ratio 0. As a result, loudspeaker placement is generally not critical, but you do want to keep them off of a wall.

Fostwx FEE has been used in a wide variety of enclosures including sealed, bass reflex, Transmission Line and Quarter Wavelength enclosures.

Additionally, bipoles throw a huge wall of sound which can make them sound very dynamic. Turns out that except for some changes in the size of the port spacers it works really well.

The Fostex FEE is a mm 4. Created 19 June For two FEE drivers, the optimum volume is about 12L.

Unfortunately, with all the reflecting going on, many of the timing and phase cues are lost and thus imaging is not as good as a monopole design. This in turn results in unpleasant distortions which are present throughout the mid-range.


Created 28 February fotex This full-range driver is capable of frequency response from about 70Hz to 20kHz, but note the limited X max. A box designed to this ratio will have smaller resonant peaks than one whose dimensions are equal.

Each plays to a somewhat different strengths. BiFonken Mk ii beta. Even more far-out versions have been proposed 1. The Fonken likes small amps with highish output impedance like SETs, no-feedback push-pull. It also sounds really good.