How to Build a Sound Cannon

The use of a sound cannon is increasingly controversial, as a recent bill introduced in the state legislature aimed at banning the use of such devices. There is concern about the safety of sound-producing weapons, especially those that are loud. The maximum sound output of a sound cannon is 162 decibels, and a person suffering from hearing loss should not be exposed to a level that would cause damage. In addition, the human pain threshold for sound is 110 to 130 dB.

Long-range acoustic device

The Long-range acoustic device (LRAD) is a modern military deterrent that emits powerful sound waves to disorient people within its narrow beam. The device is typically a rounded black dish that is mounted on a police vehicle or a shipping vessel. The device is expected to permanently damage the ears of those within its beam. In 2009, Somali pirates attempted to board the luxury cruise ship Seaborn Spirit. The LRAD reportedly deterred the pirates and saved the ship and its crew.

The LRAD uses ordinary off-the-shelf drivers to project sound, similar to old-fashioned bullhorns. Its frame refocuses sound waves at a frequency in the range of 200 to 10 kHz. Because of its low frequency, the LRAD’s sound is relatively low compared to human speech, which has a range of about 10 kHz. The sound produced by the LRAD is destructive, but the frequency of the noise is lower than that of human speech.

Public address speaker system

The first step in constructing a public address speaker system is figuring out what volume you want to achieve. Depending on your setting, this may vary by room. To get the loudest volume, start by checking noise ordinances in your area. Then, look for speakers with high maximum sound pressure levels (SPL). Loudspeaker technical specs do not account for room reflections, so you can squeeze more volume from a smaller PA by raising the SPL. In addition, every speaker has a sensitivity rating.

A public address speaker system can be built using a microphone and a powered speaker. The system will also have an amplifier, EQ, wireless connectivity, and an internal mixer. Depending on your needs, a portable PA system can also have built-in wireless features. Mics and speaker systems may use standard dynamic microphones or a mix to make sure that the signal is clear. If you want to make a PA speaker system for a specific event, you can choose a model with built-in wireless features.

Ultrasonic transducer

If you’re wondering how to build an ultrasonic transducer, you’ve come to the right place. Transducers are electrical devices that use ultrasonic waves to measure certain parameters. The range of frequencies available includes low, medium, and high. The low frequency range covers the three to thirty MHz range, while the medium and high frequency ranges are 300 to three thousand MHz. The ultra high and super high frequency ranges cover the range of 30 GHz and higher.

A typical ultrasonic transducer is an immersion transducer that couples ultrasound to the test piece. If you’re interested in building an ultrasonic transducer, you’ll want to consider its beam angle and spread. Since the sound waves travel further, the area of detection increases. To determine the range of the beam, read the coverage specification on the transducer’s label. You can check whether the coverage is even in all directions.


If you are thinking of building a sound cannon for your home or for your business, you’ll have to consider several things that should be taken into account. These devices can be dangerous, resulting in permanent hearing loss, migraines, and other conditions. Children, the elderly, and people with hearing issues are particularly vulnerable. This is why ASHA urges police departments to use sound cannons in a more appropriate way. Despite these concerns, some cities have curbed or stopped using LRADs altogether, and some have adopted safer policies and practices as a result of lawsuits. Using an LRAD for a public address is a necessity, but the sound level from the device can cause hearing damage, tinnitus, and migraines, so ensuring safety is an absolute must.

The use of sound cannons is also dangerous. They can be used to prevent violence, obviate the use of potentially lethal weapons, and discourage public assembly. Their use is often seen in demonstrations following the death of Eric Garner. It has also been used to annoy protesters and warn them of riots, and even to issue commands. However, these loud loudspeakers can be used to deter protesters and police from preventing mass gatherings.


In the aftermath of the attack on the U.S.S. Cole, police sound devices were developed. The devices are capable of releasing loud, sustained sound bursts. Police first purchased them in 2004 during the Republican National Convention in New York. And in 2009, they were used during protests against a Group of 20 meeting in Pittsburgh. The lawsuit did not determine the legality of the device, but the judge’s ruling in favor of the police was upheld.

A recent case in New York saw the city reach a settlement of $750,000 with plaintiffs who claimed they were injured by police using a sound cannon. The sound cannon, officially known as a Long Range Acoustic Device, was used in the police’s arrest of Eric Garner after a five-year legal battle. The lawsuit also required the NYPD to cease using the high-frequency alert and deterrent tone on long-range acoustic devices. Those devices have been widely used by police to communicate with crowds.

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