The properties or qualities of a room or building that determine how sound is transmitted in it.
A medicine or other agent to assist hearing.
Utilizing sound energy in its operation.
(of building materials) Used for soundproofing or modifying sound.
(of an explosive mine or other weapon) Able to be set off by sound waves.
Naturally producing or produced by an instrument without electrical amplification or the need thereof.
Dealing with neurology, the study of the brain