The magnetic attachment fittings make it possible, also thanks to the lightness of the panel and to the absence of rigid or sharp-edged aluminium or PVC frames, (normally used in similar acoustic devices), to easily apply or remove panels. A solution of this type facilitates cleaning operations, both as to the panels themselves and to that of the underlying surfaces. Furthermore, with extreme simplicity, it is possible to modify the acoustics of rooms, adapting them to the user’s various needs, also allowing for varying uses for the same rooms (for example, to simply and quickly free the walls of a conference room to set up an exhibition that requires hanging paintings on the walls, positioning them in place of the panels, etc.).