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 City was Colorado's cultural capital until another opera house, Tabor Grand Opera House, opened in 1881. The Opera House was not turning a profit and it expanded its repertoire to include theatre productions to increase its revenues. They featured prominent 19th-century actors such as Joseph Jefferson, Edwin Booth, Madame Januschek and Fannie Barlow. In addition, Buffalo Bill performed here as well as P. T. Barnum's circus. Peter MacFarlane, who was a contractor for the original construction and the contractor for the 1903 renovation, became the principal owner of the Opera House by 1910, when he opened it as a motion