any of various devices, usually electronic, by which speech, music, etc., can be intensified and made audible throughout a room, hall, or the like.
a device for transforming electric signals into audible sound, most frequently used to reproduce speech and music.
speaker ( def 4 ).

1880–85; loud + speaker

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World English Dictionary
loudspeaker (ˌlaʊdˈspiːkə)
Sometimes shortened to: speaker, Also called: reproducer a device for converting audio-frequency signals into the equivalent sound waves by means of a vibrating conical diaphragm

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

loudspeaker definition

audio, hardware
An electromechanical device for converting an electrical signal into sound.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The new version will also have a microphone and a loudspeaker.
The video below, which shows a thin-film loudspeaker playing dance music while
  mounted on a waving flag, is pretty amazing.
Think of a bus station loudspeaker system, no one can understand what is
  broadcast when first exposed.
Consequently, the alarm did not sound during the emergency, leaving workers to
  relay information through the loudspeaker system.
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