Opera
Acoustic enhancement in opera

A subtle type of sound electronic reinforcement called acoustic enhancement is used in some modern concert halls and theatres where operas are performed. Although none of the major opera houses "...use traditional, Broadway-style sound reinforcement, in which most if not all singers are equipped with radio microphones mixed to a series of unsightly loudspeakers scattered throughout the theatre", many use a sound reinforcement system for acoustic enhancement and for subtle boosting of offstage voices, child singers, onstage dialogue, and sound effects (e.g., church bells in Tosca or thunder effects in Wagnerian operas).
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