Case studies

Light and resonator, Milan

Light and speaker with vibrational sound absorber give high diffusion. Bamboo offcuts forming the wall surface act as sound absorbers.

Oxidized iron cylinder, Milan

Light and sound in an oxidized iron cylinder. The cylinder absorbs the sound waves, and the difraction waves for the increase in sound. The ceiling is made of wood minerals to absorb the sound.

Omni-directional sound, Norway

Omni-directional terracotta speaker with ‘graphite’ glasses. The wooden ceiling enhances the sound quality.

Painting sound solution, Milan

Restaurant with very hard surfaces and wrong proportions. High ceiling, with high reverberation and resonance. The painting creates a resonator and absorption sound wave to reduce the time delay and increase the quality of the sound and speech clarity.


Wireless single stereo speaker with Airplay technology. ZEMI Aria was a project designed to resolve the poor sound quality in standard airplay speakers, 2013.

Sound sculpture

The ORUS is an omni-directional, non-coherence, sound wave speaker which was patented in 1996. This artistic sound sculpture was produced and installed by Francesco Pellisari and NacSound

Synagogue Shalom, Cambridge, UK

Two powerful omni-directional speakers with a terracotta body, positioned along the main axis of the room were used to complete the improved sound configuration. Architects: Cowper Griffith.

San Lorenzo da Brindisi

A custom-made translucent cloth stretched across the top of the dome, making it behave like a drum, was installed along with omni-directional speakers to improve the sound within the church. Architects: Paolo Marciani, Laura Montanini.

WonderLAD, Catania

Large triangular wooden panels were installed on the ceiling and walls along omni-directional speakers to improve the acoustics within the hospitality centre. Architects: Frontini Terrana, Laura Montanini

Vitra Museum, Berlin

The oval geometric shape has very high resonance modes and the reflective walls had inadequate acoustics for a conference room. The use of a single hyperdirectional central speaker and sound-absorbing armchairs solved the problem. The stereo effect was created via two direct speakers filtered in low and medium frequencies.

Radisson Hotel, Rome

This hotel in the centre of Rome was a special project to increase the quality of the acoustics within the area. Because the walls were made from reflective materials, metal and glass, the project was difficult to solve. The solution was a stunning Freewheeler speaker, an aluminum omni-directional speaker and several ZEMI and OMNI. Architects: King Roselli

Sound sculpture

Art and sound technology come together to produce extraordinary omni-directional acoustics and sublime light.