In Noordwijk in the Netherlands is the most powerful speaker in Europe. This device belongs to European Space Agency (ESA) and is used to test satellites. The room with the speaker must be very well insulated, because the sounds that go with the extract, they could even kill them.
The device is called LEAF (with English Large European Acoustic Facility) and housed in a special chamber with a width of 11 meters, a depth of 9 meters and a height of 16.5 meters. The use of nitrogen in speaker lets you create sounds with a capacity of more than 154 decibels (dB). These sounds are produced during take-off rockets ranging satellites into orbit. Hence LEAF is designed to test such devices for durability.
People working at the sound system must comply with the security rules. For example, the speaker can not be turned on if all the doors to the room with him will not be tightly closed and in the middle one will not. This is very important because the resulting sounds can cause human harm and even kill .
When noise is too loud ?
Harmful for our body may already sounds range from 35 ( working fridge) to 70 (on TV ) dB. They cause fatigue of the nervous system . By the sounds of power from 70 to 85 ( the sounds of a busy street ) dB weakens the hearing and appear headaches. With louder noises can occur dysfunction of the digestive system or circulatory system.
The limit of pain is 130 dB ( the sound of an airplane taking off ) . These sounds cause various diseases and ailments somatic and psychological nature . At 160 dB ( rocket taking off ) burst eardrums and at 185 dB begins abruptly change blood pressure. When sound reaches about 200 dB , there is a blockage in the arteries , and death occurs.
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