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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You are commenting using your Facebook account. You are commenting using your Twitter account. Figure 3 below shows a sweep of the frequency response from about Hz and up. Cymbals are crisp and there is reasonable low end response given the small size of the driver.

This site uses Akismet to reduce spam. Learn how your comment data is processed. You are commenting using your WordPress. The enclosure was tuned to about 63 Hz by using a ffx120 mm diameter port with a length of 65 mm. You can use the component values shown in Figure 2 and tune the BSC to suit your room and amplifier.

The plan and the drivers have been purchased at Art of Sound. In the photo the FX bookshelf speakers are paired with an 8-inch sealed subwoofer located in ofstex corner on the right. For additional information about the enclosures, see my previous description of the Parts Express curved speaker cabinets.

I have recently built these double bass reflex box speakers. The -3 dB point is about 58 Hz.


Fostex FX DIY Bass Reflex Bookshelf Speakers

Figure 1 shows the calculated frequency response for the Cx120 in a 0. The frequency response was calculated using WinISD. For maximum performance, it is important to have good airflow from the rear of the driver into the enclosure.

The impedance sweep confirms the box tuning of about 63 Hz. Finding myself with the need for a small pair of speakers studio monitor or bookshelf speaker I decided to once again use a fullrange driver.

Short of ordering a custom build, using a prefabricated speaker enclosures seemed like an excellent idea. The chamfer was created using a router. In small sized rooms and as a monitor, the speaker has a very clear mid-range and an extended response.

About 3 to 5 dB of attenuation is a good starting point. Removing the need for the small Fostex driver to push the bass tones greatly reduces distortion and improves the sonic performance. The prefabricated enclosures are constructed out of MDF and have a volume of 0. Last update 3 January The amount of attenuation required will be user, room and amplifier dependent. There is a bit of damping material in the upper, smaller chamber only. The Fostex FX fullrange driver looked like a very good choice.

The bass performance of them is also astonishing when they are placed fairly close against the wall. I used birch plywood for the cabinet 16mm. I have invested about EUR for the two Fostex drivers, the plywood, glue and binding posts. I guess this is do to the clarity and coherence of the sound. The MDF speaker baffle is one inch 25 mm thick so it is necessary to create a chamfer behind the driver to improve airflow.

Glue could also be used. The fullrange driver used is a Fostex FX The sound they produce is incredible. Finished photographs of the speaker are shown below. Notify me of new comments via email.


Fostex FX120 – Double Bass Reflex Loudspeaker

No crossover or notch filter is being used. Costex, your blog cannot share posts by email. A stapler was used to hold the damping material in place.

I set out to find a good quality driver with a reasonably flat frequency response. The speaker cabinets are only lightly damped.

Martinsson’s Blog – Fostex FX DIY proposal

gx120 Post was not sent – check your email addresses! The photograph below shows the front baffle with the driver and port installed. Created 25 February In some receivers this can be accomplished by setting the speakers to “small”.

The curved speaker cabinets with a piano gloss finish from parts express seemed like a perfect fit. Recently I have had some very good success with a couple of DIY tower loudspeaker projects that used fullrange speaker drivers. The enclosure design is from Fostex as well.

Very dynamic, detailed and live like. Fosteex the reciever settings, I have some control in selecting the speaker-subwoofer crossover point which I have set at 80 Hz. I have partnered them with my first LM based chipamp in a test setup on a piece of MDFwhich you can also see on the picture below. The owner was very helpfull and responsive and can be recommended.