FOSTEX FX120 FULL RANGE DRIVER

Searching a smaller driver the Fostex FX, a 12 cm fullrange unit caught my eye. Before I closed the box with front and top there were four things to do. First I attached nylon strings between the sides to keep the damping material from falling to the bottom. On the Fostex data sheet they show a flat frequency response without great peaks and drops. When the recording is good for example ‘Songs from the last century’ by George Michael and the recordings from Norah Jones the artists seem to be standing in front of you. My first try was a speaker using the Fostex FEE , but I never made proper cabinets for them because my wife said “No way, they are too big”. Another thing is to put in the damping between the inner and back plate as you cannot do this through the driver cut-out once the cabinet is closed.

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Created 5 May King for his kind help and advice I made some test enclosures out of chipboard.

I have no measurement equipment, but what I hear seems to correspond with the simulation. For the base-plate I found a granite plate at a stonecutter’s store, he made them for a moderate price for me. The cavity in the cabinet was filled with gravel to add some mass to the enclosure and prevent resonance. Afterwards I contacted M. Before I closed the box with front and top there were four things to do. Of course the bass doesn’t blow you away, fjll 50 Hz is there and it fills my room with music.

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Fullrange drivers seem arnge play music with more coherence, more life and they sound more direct. I was surprised with the performance of this driver.

Fostex FX120 Fullrange Speaker Driver (Transducer)

On the Fostex data sheet they show a flat frequency response without great peaks and drops. Of course they did not play as loud as the bigger two-way speakers that I built before, but something else was fascinating. I began to tune them by ear until I was satisfied with the music coming out of the speakers. At first they were a little bit harsh but after about hours they smoothed out.

The goal was to let them go down to about 50 Hz. Be sure dostex seal the box carefully. The Fostex FX speaker driver is well balanced, with a relaxed sound, detailed midrange and good highs also very well assembled.

Fostex FX120 DIY Transmission Line Speakers

My first try was a speaker using the Fostex FEEbut I never made ful, cabinets for them because my wife said “No way, they are too big”. In my opinion the FX is worth every cent you pay for it.

Another thing is to put in the damping between the inner and back plate as you cannot do this through the driver cut-out once the cabinet is closed. There is not rostex information available for this driver, but the feedback from people who have used was positive. When the recording is good for example ‘Songs from the last century’ by George Michael and the recordings from Norah Jones the artists seem to be standing in front of you.

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However, there are compromises with fullrange drivers; little drivers have disadvantages at the low end and bigger ones at the top end. Looking for more information about fullrange drivers, I found the Mathcad worksheets by M.

King and decided to rrange a speaker design of my own. The wiring must be in place and the hole in the back for connecting the wire with the BSC has to be sealed. The BSC is necessary, otherwise the sound isn’t balanced. With his feedback “I think you have a design” I want to thank Mr.

Fostex FX – Fullrange buy at

The enclosures were made using 15 mm birch-multiplex, the front baffle and the top is 19 mm beech, and the inner plates are 16 mm MDF. The FX will need a little help on the bottom end. Figure 1 shows the calculated frequency response for the FX for the enclosure shown in Figure 2. Small group and acoustic music sounds wonderful. Searching a smaller driver the Fostex FX, a 12 cm fullrange unit caught my eye.

The enclosures finish consisted of sanding 60, then and then grit sandpaper and four treatments “hard wax oil” foetex fires up the color of the wood and protects the surface. Last update 14 April

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