Modulator

Modulator
[[File:|200px]]
Company	Federal Signal Corporation
Produced	1995-2013
Type	Electronic
Succeeded by	Modulator II (2013)

The Modulator was an electronic siren produced by Federal Signal Corporation. It is the first generation in the Modulator series. It is comprised of cells that contain four compression driver speakers a piece, with a "dummy" cell that is empty to help even out sound distribution.

How it Works

The siren is made up of cells that contain four 100 watt compression driver speakers a piece. The sound is projected downward through an opening underneath each cell, it then bounces off the top of the cell underneath the opening and is projected outward. The bottom cell is a "dummy" cell that does not contain any speakers, it is used to help even out the sound distribution from the last active cell in the stack.

Models

The Modulator was available in eight models, the MOD1004, MOD2008, MOD3012, MOD4016, MOD5020, MOD6024, MOD6032 and MOD6048. The models can be identified by the number if cells the siren has, but the model numbers only correspond to the number of active cells it has and the total number of speaker drivers. (E.g. The MOD2008 means it has 2 active cells, plus 1 "dummy" cell, and 8 total drivers.)