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loudspeakers 
Case enclosing one or several speakers, which convert electric pulses into sound waves by means of an amplifier.
left channel
speaker cover
Thin grille made of fabric or metal that covers and protects the speakers.
right channel
diaphragm
Cone-shaped flexible part that vibrates to create sound waves in the air.
woofer
Loudspeaker designed to reproduce the low frequencies of the sound signal.
midrange
Loudspeaker designed to reproduce the middle frequencies of the sound signal.
