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. A Sealed Enclosure, often referred to as an acoustic suspension enclosure, is the simplest form of a speaker box. Note – this driver has been discontinued and is no longer being produced. The enclosure design has taken the golden ratio into consideration which helps with the final sonics. 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.

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The driver is well built and like most Fostex units, it sounds excellent.

See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example. Used in the right location, wall loaded and in a smaller room, this speaker has very special sonics which can bring out spectacular mids. This speaker system is suited for small to medium sized room with low to medium powered amplification. A Sealed Enclosure, often referred to as an acoustic suspension enclosure, is the simplest form of a speaker box. This in turn results in unpleasant distortions which are present throughout the mid-range.

Last update 12 July The table below shows a comparison of the measured results. Created 28 February In a bipole system, both drivers fire in phase with one another, but in opposite directions.


Even on a ported enclosure, the Fostex FEE drivers do not provide great bass extension, so I still would need a subwoofer. A bi-amp speaker terminal was used with one set to the BSC and the other directly to the speaker. This full-range driver is capable of frequency response from about 70Hz to 20kHz, but note the limited X max.

As a result, loudspeaker placement is generally not critical, but you do want to keep them off of a wall. Created 12 November 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.

The sound is a bit brilliant and forward. Note – this driver has been discontinued and is no longer being produced. The cone is made of banana plant’s fiber and this it is very light and the driver is fast.

DIY Sealed Bipole Speaker Project with Fostex FEE Driver

The increased room reflections provide a good response off axis and a better sound stage i. I connected the unfinished speakers without the damping materials to my two Sonic Impact T-Amps.

This way I have the option of using the BSC or by-passing it. As a result, sealed box systems are ffe127e the least efficient enclosures since half of the radiation from the driver i. Baffle Step Compensation Circuit. The following circuit was added to the speaker input terminal.


There is no rule to say the response has to be flat and in this instance, sounded much better with the 1 dB peak.

Fostex FE127E Full Range Speaker

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. 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.

I wanted to do the sealed enclosure since this would improve the midrange and the bass will be tighter.

Figure 01 shows the calculated frequency response. 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.

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The narra was left over from our kitchen cabinets. 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.

Bass is tighter, but of course, you need a subwoofer for frequency lower than 80Hz. Last update 12 July

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