Sonic Dissipator
this ovoid device is used by beings who need to control sound in an enclosed environment. Initially designed for miners and demolition crews, the dissipator takes ambient sound waves and literally eats them, reducing both the volume and amount of sound. The user could then set off explosions in close proximity and not have to worry about damage to their hearing organs. Later, bounty hunters and other criminals discovered that sonic dissipators could be used to hide their activities.