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."
Haiphong Opera House Haiphong Opera House Haiphong Opera House (Vietnamese "Nhà hát lớn Hải Phòng") is a French-built neoclassical opera house on Opera Square ("Quảng trường Nhà hát lớn") in Hai Phong, which was opened in 1912. The first performance of opera in Haiphong was held by a travelling troupe in the Hotel des Colonies in 1888. Later 1895-1897 a touring French opera company in Indochina, featuring Alexandra David-Néel as prima donna toured Haiphong with La Traviata and Carmen. Another touring company, while waiting for the 1902 Exposition of Hanoi to open, came to Haiphong, including Blanche Arral. The French colonial authorities cleared