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Rear panel of a medium-sized PA system, positioned at one side of the stage at a concert of the musical group Dead Can Dance in 2022, the size being a
Rear panel of a medium-sized PA system, positioned at one side of the stage at a concert of the musical group Dead Can Dance in 2022, the size being about 3 m from left to right. The setup includes the mixing console for the sound engineer (operating interface with slide controls etc. on the rear) and also the power amplifiers with loudspeaker cables, not in the picture are only the loudspeaker systems distributed around the stage.
A late 19th-century speaking trumpet used by firefighters
A late 19th-century speaking trumpet used by firefighters
A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale
A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale
Factory, February 1918, page 361
Factory, February 1918, page 361
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A fire control system's RS-232 data connection which an emergency communication system may interface with
A fire control system's RS-232 data connection which an emergency communication system may interface with
Early civil defense type of siren
Early civil defense type of siren
Short-wave Radio
Short-wave Radio
Audio public address speakers
Audio public address speakers