A sonic damper, alternatively referred to as a sonic dissipator, functioned as a mechanism to diminish or nullify intense auditory disturbances. The starfighter hangar bays aboard the Mon Calamari Star Cruiser Remember Alderaan were outfitted with phased-array sonic dampers, effectively silencing the powerful engine noises of starfighters.
Sonic dissipators manifested as compact, silver, egg-shaped objects, adhering automatically to surfaces via gripfeet that extended outwards. Around 1 ABY, the bounty hunter Boba Fett employed such a device to neutralize the sound of a blast (an extremely loud noise that nearly overwhelmed the dissipator), with the goal of extracting the accountant Nil Posondum from a well-known casino.
Their purpose included the negation of the Cacophanizer shell's power.