Long Range Acoustic Device
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The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers. LRAD systems are used for long range communications in a variety of applications including as a means of non-lethal, non-kinetic crowd control. They have been called "sonic weapons".
According to the manufacturer's specifications, the systems weigh from 15 to 320 pounds (6.8 to 145.1 kg) and can emit sound in a 30°- 60° beam at 2.5 kHz. The manufacturer also produces systems for public address and mass notification use that broadcast 360°.
LRAD systems are used by law enforcement, government and defense agencies, as well as maritime and commercial security companies to broadcast audible notifications and warnings over distance. LRAD systems are also used to deter wildlife from airport runways, wind and solar farms, nuclear power facilities, gas and oil platforms, mining and agricultural operations, and industrial plants.
The parameter "ka", which is the wave number multiplied by the speaker radius, is often used to characterize sound source directivity. For this source, ka=19 at 2.5 kHz, and according to the LRAD data sheet, the beam angle of about 30 degrees total is what is predicted for a regular loudspeaker.
Small spherical "point-source" acoustic devices follow the known inverse square law, which predicts the loss of 6 decibels (dB) per doubling of distance from the source, solely due to geometric spreading. Large speakers (or large arrays), such as these, have an interference pattern in the nearfield which produces peaks 6 dB higher than the output pressure and nulls where the pressure is essentially zero. The larger the speaker, and the higher the frequency, the longer the effective nearfield. The nearfield for this device is approximately 8 metres (26 ft).
LRAD Corporation was formerly named American Technology Corporation.
Israel's Ministry of Defense ordered LRADs in June 2011.
LRAD was present, but not used, when the New York City Police department cleared Occupy Wall Street protestors from Zuccotti Park on the morning of 15 November 2011.
LRAD was present, but not used because of current legal regulations during protests in Poland, including Million Marijuana March 2011 and Marsz Niepodległości (National Independence Day March) 2011 and 2012. Lacking a way to utilize the LRADs purchased to their full potential sparked an investigation suspecting corruption behind their acquisition. National Police Headquarters spokesman Mariusz Sokolowski defended the purchase of LRAD. He also stressed that the police decided to make this investment because, "We needed good sound reinforcement equipment. With numerous demonstrations and gatherings, police need a public address system that allows you to reach thousands of people."
LRAD was deployed during a NATO march on May 20, 2012 in Chicago, Illinois at Michigan Ave. & Cermack.
The Salisbury, MD Police Department acquired an LRAD in October 2013 with proceeds from their speed cameras.
13, 18 August 2014 St. Louis County police used LRAD during protests surrounding the police shooting of Michael Brown in Ferguson, Missouri. Reporter Mike Tobin commented while broadcasting from Ferguson, MO on 18 August, “It doesn't have the effect of crippling people. It's just loud, it's annoying, it lets you know something big and official is coming and that’s what’s happening now. They can also use it as a loudspeaker to tell people to get out of the way.”
Myrtle Beach, South Carolina police obtained two LRAD systems through a federal grant in March 2015. Myrtle Beach police captain Marty Brown told the Myrtle Beach city council that 'his department is getting the LRADs to enhance their communication capabilities be it with large crowds or for emergency announcements such as evacuation orders.'
The NYPD used a Long Range Acoustic Device during the Baltimore solidarity rally in Union Square on April 29, 2015. An NYPD pickup truck equipped with an LRAD parked near protesters and broadcast a looped warning message about staying off the streets and not blocking the sidewalks.
The New Jersey State Police used an armored vehicle mounted LRAD to communicate with crowds denied entry to a June 7, 2015 concert after they began throwing bottles and tried to rush the gates outside MetLife Stadium.
The Greensboro, NC Police Department (GPD) purchased an LRAD 300X and demonstrated it for reporters in November 2015. Captain Jonathan Franks with GPD says it can be used for alerts for everything from riots to missing children to weather disasters. "I am sure, positive, 100% that in certain instances it will be able to not only save one life but numerous lives," said Franks.
Police in San Diego, CA used an LRAD on May 27, 2016 to order anti-Trump protesters to disperse.
On October 27, 2016 police from several agencies, including North Dakota state troopers, the National Guard, and other law enforcement agencies from surrounding counties and states deployed two LRADs to clear out a protest camp and blockades along Highway 1806. "Long Range Acoustic Devices, which emit an ear-splitting whine, were used intermittently throughout the day" one reporter wrote. An LRAD was present again on 11/20/2016 at the bridge just north of the protesters camp on highway 1806.
The Columbus, OH Police Department (CPD) demonstrated a Long Range Acoustic Device to the local media on November 21, 2016. CPD expects to use the device for crowd control, barricaded suspect operations, and to communicate to residents during emergencies and natural disasters.
LRAD emergency communication systems were demonstrated to city and county officials in Muskogee, Oklahoma in February 2015. "A warning system doesn't do much good if there's devastation and you can't communicate after that warning," said Muskogee Mayor Bob Coburn. "If your cell phone is down, your land line phone is down, [and] your power is out then you still have access to communicate and this [LRAD] has that potential."
For its multi-week March 2016 event, the Houston Livestock Show & Rodeo had an LRAD mass notification system on the grounds in case attendees needed to be warned of emergencies or extreme weather events.
The Singapore Navy is equipping its new fleet of eight Littoral mission vessels with Long Range Acoustic Devices.
The Vietnam Coast Guard is deploying LRAD on its vessels.
RPB 33 coastal patrol boats in service with the navies of Senegal, Togo and Ivory Coast are equipped with LRADs for communication over long distances.
On November 5, 2005, the luxury cruise ship Seabourn Spirit employed an LRAD to repel pirates who attacked the vessel with rocket-propelled grenades about 115 km off the coast of Somalia. The effectiveness of this device during the attack is not completely clear, but the pirates did not succeed in boarding the vessel and eventually fled.
The Liberian vessel MV Biscaglia was attacked on November 28, 2008. The security detachment aboard Biscaglia claimed to have used an LRAD device in an effort to repel attackers armed with assault rifles and rocket-propelled grenades. Following a one-sided shootout, the ship was seized and the unarmed security contractors abandoned ship leaving the ship and crew to the pirates. The incident caused the usefulness of LRADs to be called into question by Lloyd's List. In August 2013, Carl "Rocky" Mason, one of the three members of the security attachment aboard the Biscaglia during the incident, stated that an LRAD was aboard, but that he and the security attachment only had time to open the water cannons before gunfire and an RPG round forced them to abandon ship. No attempt was made to use the LRAD device during the incident.
London Olympics 2012
In February 2009, the Japanese whaling fleet operating in Antarctic waters near Australia installed LRADs on their vessels. The device was used against activists of the Sea Shepherd Conservation Society. The Japanese fleet later escalated the use of LRAD, deploying it against a Sea Shepherd helicopter carrying a camera crew. Sea Shepherd noted that they had an LRAD of their own, but as of early 2010, had not put it into use other than to play a recording of "Ride of the Valkyries" in the manner of attacking U.S. Army helicopters depicted in the 1979 film Apocalypse Now.
- Australia: Victoria Police, the Western Australian Police, the South Australia Police, the Queensland Police Service and the Australian Federal Police have confirmed they have purchased the devices.
- Azerbaijan: Azerbaijan police 
- Canada: Multiple police departments
- Czech Republic: Used first time on 18 March 2017 by the Police of the Czech Republic
- Hong Kong: Police Tactical Unit and Police Negotiation Cadre (PNC) of the Hong Kong Police Force
- India: Delhi Police
- Israel: Ministry of Defense
- Poland: Polish Police (Polish Police have it but for legal reasons it's not used)
- Singapore: Used by the Singapore Armed Forces
- Spain: Reported use by Catalan Police 
- Sweden: Swedish Navy 
- Turkey: Used by the Turkish Naval Forces
- United Kingdom: Ministry of Defence
- United States: Multiple police departments and US Army
- Vietnam: Being used on-board DN-2000-class ships of the Vietnam Coast Guard's fleet.
- Romania: Used first time on 7 June 2015 by Jandarmeria Romana
- Applications - LRAD Corporation website
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- LRAD Corporation website
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- Australian police authorities buying up sound weapons, The Law Report, ABC Radio, May 17, 2016
- This Pain-Inducing Acoustic Device Used to Control Crowds in Azerbaijan Might Be U.S.-Made, The Atlantic, March 14, 2013
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- [=http://www.eldiario.es/politica/Centenares-personas-recorren-Madrid-Gamonal_0_219078935.html El Diario : News : Los mossos utilizan un cañón de sonido para dispersar a los manifestantes en Barcelona]
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