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" ... During its last eruption in 2015, researchers discovered a strange noise coming from the volcano. The noise couldn't be heard by humans as its frequency is beneath 20 Hz, which is outside human hearing range. Instead, this "infrasound" signal was recorded by equipment installed to monitor the volcano. The signal, picked up on a daily base, was named "tornillo" by the researchers, a Spanish word for a screw, as the signal resembles sort of a screw if plotted in a diagram. A tornillo is a 90 second-long oscillating signal, starting suddenly and decreasing over time in intensity. ... "
" ... To top off a deluxe home cinema configuration, there’s Focal’s Sub 1000 F subwoofer which also uses a flax cone. The Sub 1000 F's extended infrasound frequency response, coupled with its high sound pressure level capacity, and stable tonal balance, even at very high volumes, should keep movie fans immersed in the heart of the action. ... "