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."
City Opera House (Traverse City, Michigan) City Opera House provided a 1200-seat performance space for traveling artists as well as a perfect setting for formal balls, such as an Installation Ball held in 1892. In 1920, a local movie house leased the building and shuttered it to eliminate competition. it was leased through the 1940s, and remained closed until 1985. In 1978, work began to raise money for restoration. In 1980, the owners gave the structure to the city, and restoration work began in 1985. In 2005, the bulk of a 30-year and 8.5 million dollar restoration was completed. The City Opera House is a square,