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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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. It also sounds really good.


Created 12 November The increased room reflections provide a good response off axis and a better sound stage i. The long ports with a very high aspect ratio naturally provide a port with high resistance. Last update 12 July 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. Turns out that except for some changes in the fostsx of the port spacers it works fe12e well.

With a sealed enclosure, the back wave does not interfere with the front wave because it is trapped in the sealed box.

For two FEE drivers, the optimum volume is about 12L. They can be made fully aperiodic with the addition of foam plugs in the ports.

Fostex FEE Fullrange Loudspeaker Driver

There is no rule to say the response has to be flat and in this instance, sounded much better with the 1 dB peak. As a result, sealed box systems are typically the least efficient enclosures since half of the radiation from the driver i.


The results shown below are the average of four drivers which were very fotsex matched. Last update 17 December A box designed to this ratio will have smaller resonant peaks than one whose dimensions are equal. Classic Goldern Ratio GR.

On that basis, this project uses a sealed enclosure in an attempt to get the best mid-range performance from these drivers. As you can see, the parameters measured do not match very closely with those published by the manufacturer.

DIY Sealed Bipole Speaker Project with Fostex FEE Driver

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.

Note – this driver has been discontinued and is no longer being produced.

Created 19 June It is magnetically shielded for use near television or CRT monitor. Also, take a look at this thread for FEE modifications. 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. The measurements were made at about costex degrees Celsius.

The Fostex FEE driver is cm 4. A bi-amp speaker terminal was used with one set to the BSC and the other directly to the speaker. 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. The frame of the driver is stamped steel, so it will benefit from some damping. These serve different sets of user needs.


In addition to the cabinet bracing, small blocks of various sizes and shapes were glued to the inside panels in random and non symmetrical locations to further alter resonances and helped to use up the 1. Fosted above calculations are for inductor and resistor values to suit the FEE driver DCR of 6R9 on the sample used and the baffle width.

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. 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. 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.

Here the Fostex FEE fullrange driver is used in a small vented bass reflex box. A diyAudio thread on a Fonken build. Many designers like to use the Golden Ratio 0.

The cone is made of banana plant’s fiber and this it is very light and the driver is fast. The drivers main flaw is a little bit of shout, which some have managed to address through modifications.

This speaker system is suited for small to medium sized room with low to medium powered amplification. Figure 01 shows the calculated frequency response.