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Federal Signal Modulator 6024 [Ultravoice] Hi-Lo Tone

General description:
The modulator is composed of speaker cells (ranging from two to eight with the exception of seven) that contain four speaker drivers per cell, although two models (model 6032 and 6048) had additional drivers available when they were still available. 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. Modulators that are being made now use the UltraVoice controller. When they were first made, they were used with Modulator Control Plus and basic/standard Modulator Controls.
Models:
Modulator model numbers identify the number of cells, as well as the number of drivers. The first family of modulator arrays consisted of eight different models, as follows: 1004, 2008, 3012, 4016, 5020, 6024, 6032, and 6048.

In January 2013, Federal Signal released the Modulator II sirens, consisting of the 1004B, 2008B, 3012B, 4016B, 5020B, 6024B, and 8032B. They provide the same alerting technology as the original modulator with the exception of a smaller compact chassis and cylindrical modules instead of elliptical ones.[1]

Warning tones:
Like Federal Signal's previous Electronic Outdoor Warning Siren series, the modulator can produce seven standard warning tones. The seven standard tones are: Wail, Alternate Wail, Pulsed Wail, Steady, Alternate Steady, Pulsed Steady and Westminster Chimes.[2] If properly equipped, the modulator can also employ voice notification to give specific information or to give a more clear understanding of an emergency situation. They have also been known to play Star Spangled Banner during tests on or near the 4th July, and also on military bases that have the sirens there.

The sirens can be activated by radio using single tone, two-tone, DTMF, MSK or POCSAG over analog, digital and trunking systems, or by satellite, cellular, landline or IP. They are also capable of being activated automatically by the Emergency Alert System.[2]
Similar devices:
The modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. The Whelen arrays have single driver cells,[3] while modulators have multi-driver cells. Another siren that is similar to the modulator is the American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, just like the modulator.
Production: 1990's-2013
Production of B Series/II Series: 2013-Present