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concerning the speaker
an office machine for transcription that records words spoken into it and then reproduces them, called Dictaphone
a loudspeaker called a woofer
the speakers
a speaker
stereo equipment that lets one adjust the frequency response of the sounds called a graphic equalizer
a speaker unit for gamut
a speaker who lisps
a spectrograph for acoustic spectra
a loudspeaker used for projecting out sound
a technician who controls sound volume