An electropneumatic acoustic horn is disclosed, comprising an electric compressor
unit for generating compressed air and a sound wave generator comprising at least
an acoustic chamber associated to at least a volute wound acoustic duct adapted
to propagate the produced sound to the outside. Air channelling means put the compressor
unit in communication with each acoustic chamber. The compressor unit and the sound
wave generator are mechanically connected in a removable way by fitting slidingly
a collar.