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Sound reinforcement system
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===Classical music and opera=== [[File:20070919 Pritzker Pavilion speakers.JPG|left|thumb|the first permanent LARES outdoor speakers at a concert venue named [[Jay Pritzker Pavilion]]]] A subtle type of sound reinforcement called [[acoustic enhancement]] is used in some concert halls where classical music such as symphonies and opera is performed. Acoustic enhancement systems add more sound to the hall and prevent ''dead spots'' in the audience seating area by "...augment[ing] a hall's intrinsic acoustic characteristics." The systems use "...an array of microphones connected to a computer [which is] connected to an array of loudspeakers." However, as concertgoers have become aware of the use of these systems, debates have arisen, because "...purists maintain that the natural acoustic sound of [Classical] voices [or] instruments in a given hall should not be altered."<ref>[http://harada-sound.com/sound/handbook/intro2.html Why do you need a Sound System?]</ref> Kai Harada's article ''Opera's Dirty Little Secret'' states that opera houses have begun using electronic acoustic enhancement systems "...to compensate for flaws in a venue's acoustical architecture." Despite the uproar that has arisen amongst operagoers, Harada points out that none of the opera houses using acoustic enhancement systems "...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." Instead, most opera houses use the sound reinforcement system for acoustic enhancement, and for subtle boosting of offstage voices, onstage dialogue, and sound effects (e.g., church bells in [[Tosca]] or thunder in Wagnerian operas).<ref>LiveDesignOnline.com. Kai Harada, Mar 1, 2001. [http://livedesignonline.com/mag/show_business_operas_dirty_little/ ''Opera's Dirty Little Secret''.] Retrieved on March 24, 2009.</ref> These systems use microphones, computer processing "with delay, phase, and frequency-response changes", and then send the signal "... to a large number of loudspeakers placed in extremities of the performance venue." Another acoustic enhancement system, [[VRAS]] uses "...different algorithms based on microphones placed around the room." The Deutsche Staatsoper in Berlin and the Hummingbird Centre in Toronto use a [[LARES]] system. The Ahmanson Theatre in Los Angeles, the Royal National Theatre in London, and the [[Vivian Beaumont Theater]] in New York City use the SIAP system.<ref>Entertainment Design, Mar 1, 2001 {{cite web |url=http://industryclick.com/magazinearticle.asp?releaseid=5643&magazinearticleid=66853&siteid=15&magazineid=138 |title=PRIMEDIA Business Magazines & Media Inc |access-date=2007-10-25 |url-status=dead |archive-url=https://web.archive.org/web/20131031082324/http://industryclick.com/magazinearticle.asp?releaseid=5643&magazinearticleid=66853&siteid=15&magazineid=138 |archive-date=2013-10-31 }}</ref>
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