Opera house electronic libretto systems have begun to be used in some opera houses, including New York's Metropolitan Opera, Milan's La Scala, and the Crosby Theatre of The Santa Fe Opera, which provide two lines of text on individual screens attached to the backs of the seats so as to not interfere with the visual aspects of the performance. A subtle type of sound reinforcement called acoustic enhancement is used in some opera houses. Acoustic enhancement systems help give a more even sound in the hall and prevent "dead spots" in the audience seating area by "...augment[ing] a hall's intrinsic acoustic characteristics."
Central City Opera House which tells the story of wealthy mine-owner Horace Tabor and his second wife Baby Doe Tabor. It was first performed in 1956. In 2001, it was the first opera company in the United States to produce "Gloriana" of Elizabeth I by Benjamin Britten. Gioachino Rossini's "The Barber of Seville" was performed by the Central City Opera in 2015. Samuel Ramey and Beverly Sills have performed at the opera house. It was noted by Daniel Rule, who managed the Central City Opera company, that 29 of the performers of the Metropolitan Opera in New York had performed at Central City. The