Fostex has always been highly regarded in the “Full /Wide range” product category. There are always a few that stand out above the others, and the FX is. It looks like there are not so many people that ended up buying the Fostex FX , despite there seems to be a widespread good opinion about. Information about the Fostex FX fullrange speaker driver (transducer) including datasheet and speaker box (enclosure) plans.

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Fostex FX120 – Double Bass Reflex Loudspeaker

In the photo the FX bookshelf speakers are paired with an 8-inch sealed subwoofer located in the corner on the right. Short of ordering a custom build, using a prefabricated speaker enclosures seemed like an excellent idea. fostexx

Fill in your details below or click an icon to log in: The impedance sweep confirms the box tuning of about dx120 Hz. In some receivers this can be accomplished by setting the speakers to “small”.

The bass performance of them is also astonishing when they are placed fairly close against the wall. There is a bit of damping material in the upper, smaller chamber only.


The frequency response was calculated using WinISD. Created 25 February The curved speaker cabinets with a piano gloss finish from parts express seemed like a perfect fit.

Figure 1 shows the calculated frequency response for the FX in a 0. The fullrange driver used is a Fostex FX The prefabricated enclosures are constructed out of MDF and have a volume of 0. Finished photographs of the speaker are shown below.

flstex Email required Address never made public. No crossover or notch filter is being used. The enclosure design is from Fostex as well. Post was not sent – check your email addresses! Recently I have had some very good success with a couple of DIY tower loudspeaker projects that used fullrange speaker drivers.

Through the reciever settings, I have some control in selecting the speaker-subwoofer crossover point which I have set at 80 Hz. The amount of attenuation required will be user, room and amplifier dependent.

I used birch plywood for the cabinet 16mm.

Fostex FX120 Fullrange Speaker Driver (Transducer)

The -3 fx1220 point is about 58 Hz. I set out to find a good quality driver with a reasonably flat frequency response. The sound they produce is incredible. You are commenting using your WordPress. Glue tx120 also be used.

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The owner was very helpfull and responsive and can be recommended. Cymbals are crisp and there is reasonable low end response given the small size of the driver. The speaker cabinets are only lightly damped. I have recently built these double bass reflex box speakers.

Fostex FX Fullrange Speaker Driver (Transducer)

The chamfer was created using a router. Figure 3 below shows a sweep of the frequency response from about Hz and up.

For maximum performance, it is important to have good airflow from the rear of the driver into the enclosure. Fx210 stapler was used to hold the damping material in place.

The Fostex FX fullrange driver looked like a very good choice. I have invested about EUR for the two Fostex drivers, the plywood, glue and binding posts.