Here is an interesting qoute from a website about low frequencies at high levels, and what they can do...
"12 Cycles Per Second (Hz) - Walt Disney and his artists accidentally experienced infrasound on one occasion. A cartoon sound effect was slowed from 60 cycles per second to 12 cycles per second via a tape-editing machine and was amplified through the theater system. The resulting tone, though brief in duration, produced in the entire crowd nausea that lingered for several days.
100 Cycles Per Second (Hz) - At this level, a person experiences irritation, "mild nausea, giddiness, skin flushing, and body tingling." Following this, a person undergoes "vertigo, anxiety, extreme fatigue, throat pressure, and respiratory dysfunction." (source; the Sonic Weapon of Vladimir Gavreau, by Gerry Vassilatos)
60 - 73 Cycles Per Second (Hz) - "coughing, severe sternal pressure, choking, excessive salivation, extreme swallowing pains, inability to breathe, headache, and abdominal pain" were present. In the post exposure phase, test subjects continued to cough, exhibit fatigue, and have skin flushing for up to four hours. (Source - THE SONIC WEAPON OF VLADIMIR GAVREAU, by Gerry Vassilatos)
WALL CURRENT - In the United States, wall current is 60 cycles per second (Hz). In Europe, the wall current is 50 cycles per second. Since European current has a lower cycle, an observer can actually see light bulbs slightly flicker.
43 - 73 Cycles Per Second (Hz) - lack of visual acuity, IQ scores fall to 77% of normal, distortion of spatial orientation, poor muscular coordination, loss of equilibrium, slurred speech, and blackout.
1 - 10 Cycles Per Second (Hz) - "Lethal infrasonic pitch lies in the 7 cycle range. Small amplitude increases affect human behavior in this range. Intellectual activity is first inhibited, blocked, and then destroyed. As the amplitude is increased, several disconcerting responses have been noted. These responses begin a complete neurological interference. The action of the medulla is physiologically blocked, its autonomic functions cease." (source; the Sonic Weapon of Vladimir Gavreau, by Gerry Vassilatos)
50 - 100 Cycles Per Second (Hz) - at 150 dB and higher, "intolerable sensations in the chest and thoracic region can be produced - even with the ears protected. Other physiological changes that can occur include chest all vibration and some respiratory rhythm changes in human subjects, together with hypopharyngeal fullness (gagging). The frequency range between 50 and 100 Hz also produces mild nausea and giddiness at levels of 150 - 155 dB, at which point subjective tolerance is reached. At 150 to 155 dB (0.63 to 1.1 kPA), respiration-related effects include substernal discomfort, coughing, severe substernal pressure, choking respiration, and hypopharyngeal discomfort." (source; 'Acoustic Trauma: Bioeffects of Sound,' by Alex Davies)
7 Cycles Per Second (Hz) - The most profound effects at this infrasonic level occur here. Seven Hz "corresponds with the median alpha-rhythm frequencies of the brain. It is also commonly alleged that this is the resonant frequency of the body's organs and hence organ rupture and death can occur at high-intensity exposures." (source; 'Acoustic Trauma: Bioeffects of Sound,' by Alex Davies)Scientific Applications and Research Associates (SARA) - This agency's alleged infrasound research showed, "infrasound at 110 - 130 dB would cause intestinal pain and severe nausea. Extreme levels of annoyance or distraction would result from minutes of exposure to levels 90 to 120 dB at low frequencies (5 to 200 Hz), strong physical trauma and damage to tissues at 140 - 150 dB, and instantaneous blastwave type trauma at above 170 dB. At low frequencies, resonance's in the body would cause hemorrhage and spasm/ in the mid-audio range (0.5 to 2.5 kHz), resonance's in the air cavities of the body would cause nerve irritation, tissue trauma and heating; high audio and ultrasound frequencies (5 to 30 kHz) would cause heating up to lethal body temperatures, tissue burns, and dehydration; and at high frequencies, or with short pulses, bubbles would form from cavitation and micro-lesions in tissue would evolve." (source; 'Acoustic Trauma: Bioeffects of Sound,' by Alex Davies)
Infrasound Toxicological Summary, November 2001 - "When male volunteers were exposed to simulated industrial infrasound of 5 and 10 Hz and levels of 100 and 135 dB for 15 minutes, feelings of fatigue, apathy, and depression, pressure in the ears, loss of concentration, drowsiness, and vibration of internal organs were reported. In addition, effects were found in the central nervous system, the cardiovascular system, and the respiratory system. Synchronization phenomena were enhanced in the left hemisphere. Visual motor responses to stimuli were prolonged, and the strength of the effect was reduced. Heart rate was increased during the initial minutes of exposure. Depression of the encephalic hemodynamics with decreased venous flow from the skull cavity was observed. Heart muscle contraction strength was reduced. Respiration rate was significantly reduced after the first minute of exposure."
The U. S. Navy has an anti-submarine device called Low Frequency Active (LFA) sonar. It emits 240 dB. Damage was possibly done to whales and dolphins, causing them to beach. Whales avoid areas with 120 dB or above. The Navy sets 140 dB as the maximum level of safe exposure to humans.
Long pipe organs, such as those found in churches and cathedrals produce infrasound. In one UK study, the extreme bass frequencies instilled strange feelings at a concert hall. Effects were "extreme sense of sorrow, coldness, anxiety, and even shivers down the spine." (source; Organ Music Instills Religious Feelings,' by Jonathan Amos, 9/8/2003)"
This was found here... http://www.lowertheboom.org/trice/infrasound.htm