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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The response curve seemed good and the drivers generally seem to receive very positive comments from other DIY hobbyists on the forums.

Fostex FX – Double Bass Reflex Loudspeaker – Michael’s Project Page

There is a bit of damping material in the upper, smaller chamber only. The frequency response was calculated using WinISD.

Post was not sent – check your email addresses! The bass performance of them is also astonishing when they are placed fairly close against the wall.

In the photo the FX bookshelf speakers are paired with an 8-inch sealed subwoofer located in the corner on the right. Very dynamic, detailed and live like. You can use the component values shown in Figure 2 and tune the BSC to suit your room and amplifier. The impedance sweep confirms the box tuning of about 63 Hz.

The curved speaker cabinets with a piano gloss finish from parts express seemed like a perfect fit. I have recently built these double bass reflex box speakers. View all posts by zimmer I used birch plywood for the cabinet 16mm. The foshex and the drivers have been purchased at Art of Sound.


The amount of attenuation required will be user, room and amplifier dependent. The prefabricated enclosures are constructed out of MDF and have a volume of 0. Fill in your details below or click an icon to log in: The chamfer was created using a router.

The main problem I faced was that I am not skilled fostrx woodworking, but I wanted a pair of fosetx speakers. Removing the need for the small Fostex driver to push the bass tones greatly reduces distortion and improves the sonic performance. You are commenting using your WordPress.

In small sized rooms and as a monitor, the speaker has a very clear mid-range and an extended response. The sound they produce is incredible.

Fostex FX DIY Bass Reflex Bookshelf Speakers

The -3 dB point is about 58 Hz. Recently I have had some very good success with a couple of DIY tower loudspeaker projects that used fullrange speaker drivers. Notify me of new comments via email. The Fostex Flstex fullrange driver looked like a very good choice. The enclosure was tuned to about 63 Hz by using a 42 mm diameter port with a length of 65 mm. Figure 3 below shows a sweep of the frequency response from about Hz and up.

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. Cymbals are crisp and there is reasonable low end response given the small size of the driver. 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.


The owner was very helpfull and responsive and can be recommended. Last update 3 January Through the reciever settings, I have some control in selecting the speaker-subwoofer gx120 point which I have set at 80 Hz.

Fostex FX120 Fullrange Speaker Driver (Transducer)

Sorry, your blog cannot share posts by email. Finished photographs of the speaker are shown below.

You are commenting using your Twitter account. I have invested about EUR for the two Fostex drivers, the plywood, glue and binding posts. You are commenting using your Facebook account.

The fullrange driver used is a Fostex FX The enclosure design is from Fostex as well. I set out to find a ofstex quality driver with a reasonably flat frequency response. No crossover or notch filter is being used. For maximum performance, it is important to have good airflow from the rear of the driver into the enclosure.

In some receivers this fosrex be accomplished by setting the speakers to “small”. Glue could also be used. Notify me of new posts via email. The MDF speaker baffle is one inch 25 mm thick so it is necessary to create a chamfer behind the driver to improve airflow. Email ffx120 Address never made public. About 3 to 5 dB of attenuation is a good starting point.