Californians are just now getting a taste because of more stringent vehicle codes concerning light output and sound that had to be addressed. The Rumblers are being tested or used in a few cities across the country, including New York, Washington, D.C., and Elk Grove, Calif. The low-frequency tone can penetrate and shake solid materials, allowing anyone nearby to actually feel the sound waves and perhaps even witness their rearview mirror shake. It's not an overwhelming violent shaking, but a subtle feeling like a freight train kind of a rumbling."Īccording to manufacturer specifications, the Rumbler interacts with 100/200-watt siren amplifiers and provides a secondary, low-frequency tone. That alone gets attention, but then you will actually feel it. It mimics the tone but it's done at a much lower hertz level. "It just provides a contrast to the typical high-frequency siren. "It's an additional tool to combat distracted drivers, whether they have the stereo on, air conditioning, cell phones or general ambient noise," Sanchez said. The list price for the whole shebang is $685, according to Carlee Sanchez, senior district sales manager for Federal Signal. Now San Francisco has two 2008 Ford F-450s equipped with the Rumbler, which consists of a slave amplifier, a timer that's activated when the driver taps the horn, two speakers that operate like subwoofers and a mounting bracket. That day Lee knew the Rumbler would work as needed during a crisis. If it had been a regular siren, people would have pulled in front of me like, 'What do you want?' but everyone got out of the way." They were stopping to see what was going on. "Cross traffic was at a standstill as I went back to City Hall. "I'm watching people two and three blocks ahead of me, frozen with their hands covering their ears," Lee said. On went the siren, red and blue lights flashing, and then the unique feature of the Rumbler - the high-output speaker and subwoofers bounced low-frequency sound waves off buildings and vehicles. Vehicle specific mounting hardware is ordered separately.He tapped his horn, activating the Rumbler. A complete Rumbler intersection-clearing system consists of an amplifier, with built-in timer and two subwoofers. The Rumbler is particularly effective when used in dense urban environments with heavy vehicle and pedestrian traffic. The system’s timer allows the tone to sound for eight seconds, providing highly effective warning at hazardous intersections, and then automatically shuts off. It then amplifies the sound through a pair of high output woofers. Secondary System with Built-in Safety The Rumbler system senses the primary siren tone signal, and reduces the signals’ frequency by 75%. Low frequency tones have the distinct advantage of penetrating solid materials allowing vehicle operators and nearby pedestrians to FEEL the sound waves. Improves Intersection Warning Effectiveness The Rumbler introduces a revolutionary new concept to audible warning through its ability to interact with most 100/200-watt siren amplifiers and provide secondary, low frequency duplicate tones. The Rumbler®, intersection-clearing system, demonstrates the long-standing commitment of Federal Signal to continue as the technological leader in audible warning and operator safety. Enabled via any emergency vehicle steering wheel horn ring.Highly effective in dense urban environments with heavy vehicle traffic.Eight second safety timer provides automatic tone shutdown. Interacts with most 100/200-watt emergency vehicle siren amplifiers.Produces penetrating/vibrating low frequency sound waves.
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