What are the buzz words for amplifiers?

The phrase was coined in a scene from the 1984 mockumentary rockumentary This is Spinal Tap by the character Nigel Tufnel, played by Christopher Guest. In this scene Nigel gives the rockumentary's director, Marty DiBergi, played by Rob Reiner, a tour of his stage equipment. While Nigel is showing Marty his guitar amplifiers, he points out one in particular whose control knobs all have the highest setting of eleven (unlike standard amplifiers, whose volume settings are typically numbered from zero to ten), believing that this numbering actually makes the amp louder. When Marty asks why the ten setting is not simply set to be louder, Nigel pauses, clearly confused, before responding with the now famous phrase, "These go to eleven."