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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As a result, loudspeaker placement is flstex not critical, but you do want to keep them off of a wall. 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.
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Last update 17 December 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. The Fonken likes small amps with highish output impedance like SETs, no-feedback push-pull.
This in turn results in unpleasant distortions which are present throughout the mid-range. For two FEE drivers, the optimum volume is about 12L. Used in the right location, wall loaded and in a smaller room, this speaker has very special sonics which can bring out spectacular mids. Pushing these tiny X max drivers to produce bass tends to cause some loss of cone control, even at low SPL.
The long ports with a very high aspect ratio naturally provide a port with high resistance.
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. Plans fostsx are freely available for non-commercial use only. Last update 12 July Created 12 November The near-aperiodic nature is seen in the Ffostex impedance curves below — it is indicated by the small peak on the lower side of the resoance saddle.
The sonic character of these two speakers are different.
Meet the Fonkens
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. Turns out that except for some changes in the size of the port spacers it works really well. 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. Additionally, bipoles throw a huge wall of sound which can make them sound very dynamic.
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.
The frame is stamped steel so it should benefit from some damping with ductseal. They work well in a home theatre with subwoofer support.
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. 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.
Fostex FEE Fullrange Loudspeaker Driver
The enclosure design has taken the golden ratio into consideration which helps with the final sonics. See the modifications and tweaks for the Fostex FEEn fullrange speaker driver for an example.
Figure 01 shows the calculated frequency response.
See appropriate Box Plan pages. On that basis, this project uses a sealed enclosure in an attempt to get the best mid-range performance from these drivers. 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.
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.
Each plays to a somewhat different strengths. The results shown below are the average of four drivers which were very closely matched.
Last update 12 July 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.
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.