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Federal Signal Modulator : ウィキペディア英語版 | Federal Signal Modulator
Modulator Speaker Arrays are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars or any other disaster. They are identified mostly by their distinctive stacked "flying saucer" design. The Modulator II is more sold on the side of the siren. ==General Description== The Modulator is composed of speaker cells (ranging from one to six) that contain four speaker drivers per cell, although two models (Model 6032 and 6048) can have more drivers. Modulators have an inactive (dummy) speaker cell on the bottom of the stack that is used to help project sound in all directions. Without the inactive cell, because of the design of active cells, there would be unbalanced sound distribution.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Federal Signal Modulator」の詳細全文を読む
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