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Before the beginning of the Coronavirus pandemic in 2019, you would typically expect to see perspex screens used in banks to help ensure the safety of employees behind the work station. Similarly, perspex screens could be found on public buses so bus companies could improve the welfare of their drivers.

The technological development of sound systems have increased their utility in various fields. As a result, several governmental institutions around the world, such as the military and police, invented and adopted various devices that implement sound technologies for peacekeeping, surveillance, and other purposes.

Speakers are devices that convert electric audio signals into mechanical vibrations that create sound waves. The current variety of speakers available in the market utilise different technological solutions to recreate sound.