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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Finished photographs of the speaker are shown below. The amount of attenuation required will be user, room and amplifier dependent. Notify me of new posts via email.

Fostex FX DIY Bass Reflex Bookshelf Speakers

Glue could also be used. The response curve seemed good and the drivers generally seem to receive very positive comments from other DIY hobbyists on the forums. You are commenting using your Facebook account. The curved speaker cabinets with a piano gloss finish from parts express seemed like a perfect fit. Fill in your details below or click an icon to log in: The frequency response was calculated using WinISD. Sorry, your blog cannot share posts by email. Notify fotex of new comments via email.


Through the reciever settings, I have ffx120 control in selecting the speaker-subwoofer crossover point which I have set at 80 Hz.

Martinsson’s Blog – Fostex FX DIY proposal

A stapler was used to hold the damping material in place. In the photo the FX bookshelf speakers are paired with an 8-inch sealed subwoofer located in the corner on the right.

You are commenting using your Twitter account. Learn how your comment data is processed. Once all that is complete, add binding posts, wire the speakers and screw fpstex baffle on. The speaker cabinets are only lightly damped. The MDF speaker baffle is one inch 25 mm thick so it is necessary to create a chamfer behind the driver to improve airflow. Post was not sent – check your email addresses!

The -3 dB point is about 58 Hz. The main problem I faced was that I am not skilled with woodworking, but I wanted a pair of attractive speakers.

I xf120 invested about EUR for the two Fostex drivers, the plywood, glue and binding posts. The chamfer was created using a router. The enclosure was tuned to about 63 Hz by using a 42 mm diameter port with a length of 65 mm. The photograph below shows the front baffle with the driver and port installed. I guess this is do to the clarity and coherence of the sound.


The prefabricated enclosures are constructed out fz120 MDF and have a volume of 0. Figure 1 shows the calculated frequency response for the FX in a 0.

Fostex FX120 Fullrange Speaker Driver (Transducer)

The bookshelf speakers sit on VTI stands and are connected to a Denon home theater receiver in a 2. I set out to find a good quality driver with a reasonably flat frequency response. There is a bit of damping material in the upper, smaller chamber only. The fullrange driver used is a Fostex FX No crossover or notch filter is being used.

The owner was very fostxe and responsive and can be recommended. 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. About 3 to 5 dB of attenuation is a good starting point.

The impedance sweep confirms the box tuning of about 63 Hz.