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Not only do these speakers round-out the 2 channel TV end of the house but it also gives me an excellent third music listening area with quality DIY gear don’t tell the wife.
This process worked out very well. In the final assembly steps, most of the slack from the connecting wire double strains of lightly twisted wire wrap wire was removed and the drive screwed securely onto the boxes with supplied gasket.
But I don’t shy from timber or metal enclosure preparation and finishing. The double bass-reflex speaker enclosure plan is from the datasheet that was included with the Fostex FEEn driver.
Play the volume too softy and the speakers can sound quite plain and flat – play 206e too loudly and they start to sound compressed and the bass lacks detail while the mid-range sounds shouty. The Ofstex FEEn drivers are “fullrange” types and their main appeals is that no crossover is required.
What the BSC network does is to tame from the mid-range on up, without affect the lower bass response. The Fostex FEEn double bass reflex speakers sound excellent.
But when it comes to flea power amps they can make “boogie” real loud. The extremely large magnet of the driver is also covered with bitumanized heavy aluminium foil to reduce sound reflections from the back of the box. Experiment by starting with a speaker toe-in of about degrees and adjust for best results. That was the finished I had envisaged, dull and heavily stippled.
Gold plated binding posts are used to connect the speakers at the back. The augmentation to the bass output is achieved by the use an additional chamber in the bass-reflex process. Because of the big bass lift offered by the double bass-reflex type enclosure, test tones at 40Hz, 31Hz, 25Hz and even 20Hz are quite audible.
Kit, my son, had the FEEn double bass-reflex 20en in the corner of the room on a wood floor. This was a satin finish in black. Figure 1 below shows the speaker box plan from the datasheet. There are many tweaks and modifications that can be done to improve the drivers.
The circuit is simple, just one inductor and one resistor in parallel with each other and in series with the speaker. The double bass-reflex DBR speaker system is a variation of the standard bass-reflex BR enclosure that is intended to achieve further extension of the bass response.
The back loaded horn speakers are large and according to my wife ugly speakers. The advantage is that there is no crossover distortion or suppression of 206e dynamics which occurs with almost all passive crossover circuits. The whole box sounds like it is working real hard. For those who will ask, the impedance equalization circuit Zobel network for the Fostex FEEn driver shown Figure 3 can be used.
The horn speakers use the Fostex FEEn 8″ fullrange driver. A family friend had built me the back-loaded horn speaker cabinets and at the same time a pair double bass-reflex boxes also for the Fostex FEEn driver. Created ofstex September The stipple finish, which had started with the undercoat, was now built on with the top coat.
Luckily when the double bass-reflex speaker boxes arrived they had already been sanded down and that meant I only had to finish the surface preparation with a pass of fine sand paper before applying a coat of primer. Now many may find that the BSC circuit can reduce or suppress the dynamics and for that reason I don’t really like to use them. Another way to try and compensate for the natural rising response of the FEEn is to position the speakers off-axis ie.
Now I’m triply happy. I have added bituminous aluminium foil to dampen the driver frame.