A few companies, including Victor Talking Automaton Assemblage and Pathe, produced history players using compressed-air loudspeakers. However, these designs were significantly bound by their poor sane quality and their inability to Wireless Speakers reproduce sound at bottommost volume. Variants of the coordination were given over for public address applications, and more recently other variations have been hand-me-down to attempt space equipment resistance to the plain loud robust and vibration levels that launching rockets produce.
Full area drivers often employ an additional cone called a whizzer: a small, glossy cone attached to the joint between the shout coil and the crackerjack cone. The whizzer cone extends the elevated frequency response of the driver and broadens its lank frequency directivity, which would otherwise be greatly narrowed due to the outer diameter cone material failing to keep up with the central sound coil at higher frequencies.