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Early speaker from Vega Labs. Cerwin-Vega was founded as Vega Associates [4] (with later name changes to Vega Laboratories and then Cerwin-Vega) by aerospace engineer Eugene J. "Gene" Czerwinski (1927–2010) in 1954, [4] and became noted for producing an 18" speaker capable of producing 130 dB in SPL at 30 Hz, an astonishing level during its time.
When receiving the noise signal, the amplifier and subwoofers responded with sound pressures ranging from 100 dB to 120 dB. The resulting rumble could be felt by audience members as well as heard. [1] For the film Earthquake, Sensurround was activated during the quake scenes to augment the conventional soundtrack. [5]
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
The magnitude 4.7 earthquake just north of Malibu on Thursday morning adds to what scientists say is an unusually active year for moderate earthquakes in Southern California.
The China seismic intensity scale is a national standard of the People's Republic of China [1] used to measure seismic intensity.Similar to EMS-92 on which CSIS drew reference, seismic impacts are classified into 12 degrees of intensity, or liedu (Chinese: 烈度; pinyin: lièdù, literally "degrees of violence") in Roman numerals from I for insensible to XII for landscape reshaping.
Historical earthquakes is a list of significant earthquakes known to have occurred prior to the early 20th century. As the events listed here occurred before routine instrumental recordings — later followed by seismotomography imaging technique, [1] observations using space satellites from outer space, [2] artificial intelligence (AI)-based earthquake warning systems [3] — they rely mainly ...
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