Modulator

Modulator
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Company	Federal Signal Corporation
Produced	1990-2013
Type	Electronic
Sound output	106-125
Succeeded by	Modulator II

The Modulator was an electronic siren produced by Federal Signal Corporation. It is modular, containing a variable number of cells. Each active cell contains up to four 100W compression drivers and directs sound downward to the top of the cell below it, where it is redirected outward. The bottom-most cell is a dummy to direct sound from the lowest active cell.

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Black and Yellow Modulator 4016 at West Virginia State University, Cross Lanes, WV

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Control boxes for the "Bumble Mod."

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
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	These units are found with 2 controllers on it.

Examples

• A Modulator 3012 and Gamewell Diaphone in Penbrook, PA sounding for a weekly test.
• A Modulator 5020 in Ames, IA also using voice for a monthly test.
• A Modulator 2008 in The Netherlands, sounding for a monthly test.