Concrete Speakers
An alternative way to build high quality concrete speakers.


Many audio enthusiasts like the idea of building concrete speakers, because it is a very stiff and heavy material that provides excellent characteristics to be used in an audio environment. However, casting concrete can be a rather difficult task, especially if you want to build complex shapes with thin walls. Therefore i was looking for an alternative way to cast concrete and after i made my research i decided to work with concrete cloth, an innovative cement impregnated fabric that hardens upon hydration.

For the speaker design i decided to go with a back loaded horn layout that amplifies particularly low frequencies radiating for the back of a fullrange driver. I have calculated the horns specifications before i have folded it into a compact layout.

the assembly is toolless, as the sound channel is sandwiched between two wooden boards and foam rubber using lashing straps. That provides easy access for tuning, cleaning and modification.

This system is driven by a pair of Fostex FE83en, an excellent fullrange driver with a diameter of 8 centimeters. The speakers are very strong in reproducing frequencies of 70 Hz and above, an additional subwoofer is planed.

Materials: Concrete Cloth, water (for hydration), plywood, foam rubber, speaker driver, cables and terminals.

Dimensions: 50 cm (H) x 15 cm (B) x 40 cm (T).

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