(57) The invention relates to a device to be used for changing the acoustic properties
of a room, comprising a pressure transducer (1), a loudspeaker (2) and an electronic
control circuit (3) adapted to generate, in response to pressure changes in the room,
an electrical signal that serves to cancel the pressure change detected by the pressure
transducer (1) when it is reproduced through the loudspeaker. For improving the properties
of the room also with respect to reverberation, the device of the invention further
includes an ambience generator (4) adapted to receive an electrical signal proportional
to the sound present in the room and to generate, in response to said signal, a signal
which produces an acoustic field containing early reflections and reverberation in
the room when reproduced through the loudspeaker (2).
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