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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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I have partnered them fostfx my first LM based chipamp in a test setup on a piece of MDFwhich you can also see on the picture below. Short of ordering a custom build, using a prefabricated speaker enclosures seemed like an excellent idea. For additional information about the enclosures, see my previous description of the Parts Express curved speaker cabinets.

The sound they produce is incredible. Notify me of new comments via email.

The amount of attenuation required will be user, room and amplifier dependent. You are commenting using your Facebook account. Notify me of new posts via email. dx120

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. Finished photographs of the speaker are shown below.

In some receivers this can be accomplished by setting the speakers to “small”. The main problem I faced was that I am not skilled with woodworking, but I wanted a pair of attractive speakers. The Fostex FX fullrange driver looked like a very good choice.


The impedance sweep confirms the box tuning of about 63 Hz. I used birch plywood for the cabinet 16mm. The speaker cabinets are only lightly damped. There is a bit of damping material in the upper, smaller chamber only.

Fostex FX120 – Double Bass Reflex Loudspeaker

Created 25 February This site uses Akismet to reduce spam. I set out to find a good quality driver with a reasonably flat frequency response. Email required Address never made public. The chamfer was fowtex using a router.

For maximum performance, it is important to have good airflow from the rear of the driver into the enclosure. About 3 to 5 dB of attenuation is a good starting point.

Fostex FX120 Fullrange Speaker Driver (Transducer)

The photograph below shows the front baffle with the driver and port installed. You are commenting using your Twitter account.

View all posts by zimmer The MDF speaker gx120 is one inch 25 mm thick so it is necessary to create a chamfer behind the driver to improve airflow. The bookshelf speakers sit on VTI stands and are connected to a Denon home theater receiver in a 2. A stapler was used to hold the damping material in place. In small sized rooms and as a monitor, the speaker has a very clear mid-range and an extended response. Cymbals are crisp and there is reasonable low end response given the small size of the driver.


Figure 3 below shows a sweep of the frequency response from about Hz and up. The owner was very helpfull and responsive and can be recommended.

Fostex FX DIY Bass Reflex Bookshelf Speakers

The curved speaker cabinets with a piano gloss finish from parts express seemed like a perfect fit. Sorry, your blog cannot share posts by email.

I have invested about EUR for the two Fostex drivers, the fx20, glue and binding posts. Figure 1 shows the calculated frequency response for the FX in a 0.

Martinsson’s Blog – Fostex FX DIY proposal

The bass performance of them is also astonishing when they are placed fairly close against the wall. Leave a Reply Cancel reply Enter your comment here No crossover or notch filter is being used. The frequency response was calculated using WinISD. Very dynamic, detailed and live like. Last update 3 January The enclosure was tuned to about 63 Hz by using a 42 mm diameter port with a length of 65 mm. Glue could also be used.

The -3 dB point is about 58 Hz. I guess this is do to foostex clarity and coherence of the sound.

The fullrange driver used is a Fostex FX You are commenting using your WordPress.