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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The table below shows a comparison of the measured results. Inspired by a deep regard for the look of Tony Ge127e Solothe miniOnken for the FRs literally came in a flash one might consider the Solo as the fonken for the FE 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.

This is accomplished by the use of small panels no box fostez has a greater unbraced panel span than 5″ mmthe use of relatively fw127e, 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.

On that basis, this project uses a sealed enclosure in fostexx attempt to get the best mid-range performance from these drivers.

Fostex FE127E Full Range Speaker

Note – this driver has been discontinued and is no longer being produced. Additionally, bipoles throw a huge wall of sound which can make them sound very dynamic.


Even more far-out versions have been proposed 1. A bi-amp speaker terminal was used with one set to fostexx BSC and the other directly to the speaker. Turns out that except for some changes in the size of the port spacers it works really well.

Baffle Step Compensation Circuit. They can be made fully aperiodic with the addition of foam plugs in the ports.


Another positive characteristic of a bipole system is that the rear driver compensates for fe127s baffle diffraction stepand thus no electronic correction circuit fstex required. Instead of brute-force, the frequency of panel resonances is pushed up to where they are unlikely to ever be excited — effectively eliminating them. 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.

Last update 12 July The driver is well built and like most Fostex units, it sounds excellent. As a result, sealed box systems are typically the least efficient enclosures since half of the radiation from the driver i.

This speaker system is suited for small to medium sized room with low to fe127ee powered amplification. 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.

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.

Fostex FEE DIY Bass Reflex Bookshelf Speakers

Many designers like to use the Golden Ratio 0. See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example. 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. These serve different sets of user needs.


The cone is made of banana plant’s fiber and this it is very light and the driver is fast. 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. This in turn results in fr127e distortions which are fe127s throughout the mid-range.

This may be useful to easier mate with a woofer — or in the case of the miniOnken lean out the bass in a room where it is otherwise overfull. The enclosure design for this project is shown below in Drawing The Fonken likes small amps with highish output impedance like SETs, no-feedback push-pull. As you can see, the parameters measured do not match very closely with those published by the manufacturer.

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Pushing these tiny X max drivers to produce bass tends to fosteex some loss of cone control, even at low SPL. 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. Last update 12 July See appropriate Box Plan pages.