The sound devices described below were used for the first time by Echelle Inconnue in September 2010 in "plan d'Aou", a district of Marseilles, France, within the framework of the Smala project in order to trace a sound cartography of Islam in the city of Marseilles.
About fifteen sound edits were geolocalized in the district, these mobile prototypes gave the possibility to each one to listen to them while walking across "plane d'Aou" (For more information read (in french) : Smala Marseille, or listen online to the sounds edits)
Several cases were imagined for a sound diffusion at the level of the district of "plan d'Aou", and our choice was made on a geolocalized sound system which makes "the walls whisper" by allowing a collective listening, located on places or selected spaces. This solution appeared the most appropriate to the context of the project and the district.