The Rumbler® traffic clearing system demonstrates the long-standing commitment of Federal Signal to continue as the technological leader in audible warning and operator safety.

Improves Traffic Warning Effectiveness
Rumbler provides a secondary, low-frequency duplicate tone. Low-frequency tones have the distinct advantage of penetrating solid materials allowing vehicle operators and nearby pedestrians to feel the sound waves.

Rumbler senses the primary siren tone signal and reduces the signals’ frequency by 75%. It then amplifies the sound through a pair of or single high-output speakers. The system’s timer allows the tone to sound for eight seconds, provides a highly effective warning, and automatically shuts off.

Secondary System with Built-in Safety
Rumbler low frequency speakers include two new different variations. The Rumbler Solo is a single speaker, allowing for easier and faster install. The Compact Rumbler low frequency speakers are a pair of compact speakers allowing for additional mounting locations.

Rumbler low frequency speakers work in conjunction with Federal Signal sirens that feature integrated Rumbler Traffic Clearing capability. This allows the sirens to produce a Rumbler tone without the need for a separate externally mounted amplifier.

Rumbler low frequency speakers are also available with a Rumbler amplifier, providing Rumbler feature to other Federal Signal sirens.

Vehicle specific mounting hardware is available and ordered separately.