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1 The use of subwoofers to provide deep bass in film presentations received a great deal of publicity in 1974 with the movie Earthquake which was released in Sensurround.

2 Initially installed in 17 U.S. theaters, the Cerwin Vega "Sensurround" system used large subwoofers which were driven by racks of 500 watt amplifiers which were triggered by control tones printed on one of the audio tracks on the film.

3 More Sensurround systems were assembled and installed.

4 By 1976 there were almost 300 Sensurround systems leapfrogging through select theaters.

5 Subwoofers came into greater popular consciousness in the 1970s with the introduction of Sensurround in movies such as Earthquake, which produced loud low-frequency sounds through large subwoofers.

6 Subwoofers received a great deal of publicity in 1974 with the movie Earthquake, which was released in Sensurround.

7 Initially installed in 17 U.S. theaters, the Cerwin Vega "Sensurround" system used large subwoofers that were driven by racks of 500 watt amplifiers, triggered by control tones printed on one of the audio tracks on the film.

8 More Sensurround systems were assembled and installed.

9 By 1976, there were almost 300 Sensurround systems leapfrogging through select theaters.

10 By the later 1970s, disco club sound engineers were using the same large Cerwin Vega Sensurround-style folded horn subwoofers that were used in Earthquake and similar movies in dance club system installations.

11 It was noted as the first film to utilize Sensurround, where massive sub-woofer speakers were installed in theaters to recreate the vibrating sensation of an earthquake.

12 Rollercoaster in Sensurround (1977) starring George Segal;

13 It is notable for the use of an innovative sound effect called Sensurround, which created the sense of actually experiencing an earthquake in theatres.

14 After several ideas were tossed about (which included bouncing styrofoam faux "debris" over audience members' heads), Universal's sound department came up with a process called "Sensurround" – a series of large speakers made by Cerwin-Vega powered by BGW amplifiers, that would pump in sub-audible "infra bass" sound waves at 120 decibels (equivalent to a jet airplane at takeoff), giving the viewer the sensation of an earthquake.

15 A famous example is Grauman's Chinese Theatre in Hollywood, California, where the "Sensurround" cracked the plaster in the ceiling.

16 The "Sensurround" process proved to be a large audience draw, but not without generating a fair share of controversy.

17 Sensurround was used again for the films Midway (1976), Rollercoaster (1977), and Battlestar Galactica (1979).

18 The 2006 Universal Studios Home Entertainment DVD release features the original "Sensurround" 3.1 audio track, duplicating the original theatrical "Sensurround" track (but oddly in mono directed to the front 3 speakers rather than the original stereo mix), but no actual 'rumble' generator was used, and only the two control tones that activated the generator can be heard.

19 End of story." Charles Champlin of the Los Angeles Times wrote that the Sensurround vibrations "succeed very nicely in making themselves felt as well as heard and they set up an anxiety which makes watching 'Earthquake' a very ambivalent experience for anyone who, so to speak, has been there before."

20 Gary Arnold of The Washington Post wrote "Thanks to Sensurround, 'Earthquake' figures to be the gimmick hit of 1974.