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See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example. Finally, the four Fostex FEE drivers arrive. Other added benefits of a sealed enclosure include a much higher attainable SPL and a better overall bass response as the speakers will be coupled with a subwoofer. A bi-amp speaker terminal was used with one set to the BSC and the other directly to the speaker. Created 19 June

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Solid Narra being Planed. The frame is stamped steel so it should benefit from some damping with ductseal. I gave them to him since I can easily build another pair.

Fostex FE127E Fullrange Speaker Driver

The following circuit was added to the speaker input terminal. 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. The table below shows a comparison of the measured results.

A sealed bipole enclosure also has the advantage of improving the soundstage for a small penalty on the separation, which is ok with the kind of music I play. Created 12 November This way I have the option of using the BSC or by-passing it. This in turn results in unpleasant distortions which are present throughout the mid-range.


The driver is well built and like most Fostex units, it sounds excellent. In a bipole system, both drivers fire in phase with one another, but in opposite directions.

Fostex FEE Full Range Speaker | eBay

My dog is trying to help so we can finish early. I connected the unfinished speakers without the damping materials to my two Sonic Impact T-Amps.

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. Also, my new modded Sonic Impact T-Amps are designed for bi-amping.

Figure 01 shows the calculated frequency response. This speaker system is suited for small to medium sized room with low to medium powered amplification. Note – this f127e has been discontinued and is no longer being produced. With a sealed enclosure, the back wave does not interfere with the front wave because it is trapped in the sealed box. On my construction, I glued the front and rear baffle first and the sides last this has something to do with the finish I wanted. fosgex

I elected to go with a bipole enclosure since it eliminates the need for a power grabbing BSC baffle step compensation circuit. Also, take a look at this thread for FEE modifications. The internal dimensions are exactly the same, same driver placement, same driver, except the construction sequence is different. The measurements were made at about 22 degrees Celsius.



As a result, loudspeaker placement is generally not critical, but you do want to keep them off of a wall. The results shown below are the average of four drivers which were very closely fotex. The cone is made of banana plant’s fiber and this it is very light and the driver is fast.

Bass is tighter, but of course, you need a subwoofer for frequency lower than 80Hz. 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. Many designers like to use the Golden Ratio 0. Here the Fostex FEE fullrange driver is used in a small vented bass reflex box.

See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example. As you can see, the parameters measured do not match very closely with those published by the manufacturer. Additionally, bipoles throw a huge wall of sound which can make them sound very dynamic.