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A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
The operator's job was to start the engine and bring it up to operating speed, then to pull and release the transmission handle to start the wailing signal generation. The Chrysler Air Raid Siren produced the loudest sound ever achieved by an air raid siren. [1]
In fact, this sound machine offers only the essentials, including a volume knob, a timer, and just six built-in sounds (White Noise, Thunder, Ocean, Rain, Summer Night, and Brook).
The best sound machines offer multiple noises, come with timers, and allow you to adjust the volume. Shop options from Hatch, Loftie, and Yogasleep now. These Sound Machines Help You Doze Off Fast ...
The human brain is sensitive to small variations in reflected sound, and this is part of the reason why a loudspeaker system sounds different at different listening positions or in different rooms. A significant factor in the sound of a loudspeaker system is the amount of absorption and diffusion present in the environment. Clapping one's hands ...
If you've been shopping in a big box retail store you've probably heard an announcement on the loudspeaker such as, "code yellow toys, code yellow toys." This "code" is one of many innocuous ...
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Some locations may have changed over the years, but here’s a Miracle Mart list from 1968 to 1970: 260 W. Exchange St., Akron; 2930 State Road, Northampton Township ...