Modulator

Modulator
[[File:|200px]]
Company	Federal Signal Corporation
Produced	1995-2013
Type	Electronic
Sound output	106-125
Succeeded by	Modulator II

The Modulator is an electronic siren produced by Federal Signal Corporation. It is the second generation in the Modulator series. It is comprised of cells that contain four 100 watt compression driver speakers a piece, with a "dummy" cell that is empty to help even out sound distribution. The siren works by sound being 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 "dummy" on the bottom 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 model number refers to the number of active cells, minus the bottom dummy cell, and drivers, of which a cell can have up to four. The first digit refers to the number of active cells in the siren and the last two refer to the number of drivers. For instance, the MOD2008 has two active cells with four drivers each, making eight drivers, plus a dummy cell on the bottom.

Model	Image	Output	Drivers	Notes
MOD1004		106 dBc	4	4
MOD2008		112 dBc	8
MOD3012		115 dBc	12
MOD4016		118 dBc	16
MOD5020		120 dBc	20
MOD6024		121 dBc	24
MOD6032		123 dBc	32
MOD6048		125 dBc	48