• info@conferencehall.co
  • Call Us: +9821 8888 5499
  • Unit 12, No. 20, the 21st St. Gandi Avenue, Vanak Sq. Tehran-Iran
  • info@conferencehall.co
  • Call Us: +9821 8888 5499
  • Unit 12, No. 20, the 21st St. Gandi Avenue, Vanak Sq. Tehran-Iran

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Ancient Greek Amphitheater

Cut the chatter! The ancient mystery surrounding the great acoustics of the theater at Epidaurus in Greece has been solved.

The theater, dating to the 4th century B.C. and arranged in 55 semi-circular rows, remains the great masterwork of Polykleitos the Younger. Audiences of up to an estimated 14,000 have long been able to hear actors and musicians–unamplified–from even the back row of the architectural masterpiece.

How this sonic quality was achieved has been the source of academic and amateur speculation, with some theories suggesting that prevailing winds carried sounds or masks amplified voices.

It’s in the seats

Now, researchers at the Georgia Institute of Technology have discovered that the limestone material of the seats provide a filtering effect, suppressing low frequencies of voices, thus minimizing background crowd noise. Further, the rows of limestone seats reflect high-frequencies back towards the audience, enhancing the effect.

Researcher Nico Declercq, a mechanical engineer, initially suspected that the slope of the theater had something to do with the effect.

“When I first tackled this problem, I thought that the effect of the splendid acoustics was due to surface waves climbing the theater with almost no damping,” Declercq said. “While the voices of the performers were being carried, I didn’t anticipate that the low frequencies of speech were also filtered out to some extent.”

However, experiments with ultrasonic waves and numerical models indicated that frequencies up to 500 hertz (cycles per second) were lowered, and frequencies higher than 500 hertz went undiminished, he said.

Acoustic traps

The corrugations on the surface of the seats act as natural acoustic traps. Though this effect would seem to also remove the low frequencies from the actors’ voices, listeners actually fill in the missing portion of the audio spectrum through a phenomenon known as virtual pitch. The human brain reconstructs the missing frequencies, producing the virtual pitch phenomenon, as in listening to someone speaking on a telephone with no low end.

The findings are detailed in the April issue of the Journal of the Acoustics Society of America.

Amazingly, the Greek builders of the theater did not themselves understand the principles that led to the exceptional audibility of sound from the stage.

Attempts to recreate the Epidaurus design never quite matched the original. Later seating arrangements featured other materials, such as wood for the benches, an approach which may have ultimately derailed the design duplication effort.

April 6, 2007
Georgia Institute of Technology

World’s first sustainable convention centre in Dublin
Zenith music hall

Maximizing the reflective qualities of both its glass and titanium exterior and the surface of the lake it sits on, China’s National Grand Theater resembles nothing so much as a gigantic metallic egg. Housing three performance auditoriums, the theater boasts an underground entrance as its only means of access, preserving a mysterious, island-like effect.

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Tenerife Concert Hall by Calatrava

Lo­ca­ted on the Ave­nue of the Con­sti­tu­tion in the Ca­na­rian ca­pi­tal, Santa Cruz de Tenerife, architect and engineer Santiago Calatrava designed a sweeping white concrete concert hall for the waterfront of Santa Cruz. Con­struc­tion began in 1997 and was com­ple­ted in 2003.

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Dubai Opera House by Zaha Hadid

The design calls for an exciting new cultural centre in the new Seven Pearls district of Dubai. This landmark development will accommodate an opera house, playhouse, arts gallery, performing arts school and themed hotel on an island in Dubai Creek just off the mainland part of the district. Read More

Harpa Concert Hall

Situated on the border between land and sea, the Harpa Concert Hall stands out as a large, radiant sculpture reflecting both sky and harbour space as well as the vibrant life of the city.

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Chaktomuk Conference Hall

One of the main tourist attractions of Phnom Penh, the capital city of Combodia, is the Chaktomuk Conference Hall. Designed by renowned architect Vann Molyvann, the Chaktomuk Conference Hall in Phnom Penh was originally opened in 1961 as La Salle de Conférence Chaktomuk.

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The Metropolitan Opera is an opera company, located in New York City. Originally founded in 1880, the company gave its first performance on October 22, 1883. The company is operated by the non-profit Metropolitan Opera Association, with Peter Gelb as general manager. The music director is James Levine.

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MUMUTH Music Theater

In the daytime, unStudio’s Haus für Musik und Musiktheater (MUMUTH) is a mysterious presence among historic houses on Lichtenfelsgasse Street in Graz, Austria’s second-largest city. A fine, stainless-steel mesh attached to gently curved steel frames completely masks the four-story, glass-and-steel structure as well as the spectacular concrete spiral that is the heart of the building.

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clyde auditorium

Glasgow’s futuristic Clyde Auditorium is a new building and part of the Scottish Exhibition and Conference Centre (SECC), Scotland’s national venue for public events and also the UK’s largest integrated exhibition/conference centre. As you can see, it looks rather like an armadillo from the outside.

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Downtown Astana With The National Concert Hall

 This auditorium – one of the largest in the world – was awarded to Studio Nicoletti as the result of an international restricted competition. Founded in the heart of the steppes only four years after the Independence of the Country, Astana is now a decade old new capital of Kazakhstan.

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Typical microphone applications for installed audio systems

August 22, 2011, by Chris Lyons, Tim Vear, & Michael Pettersen

In order to select a microphone for a specific application, and to apply it properly, it is first necessary to know the important characteristics of the sound source(s) and of the sound system.

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sound system
sound system

August / September 1999

by John Matheson

Sound Systems: Through the 1980s and 1990s there has been an unprecedented advancement of computer and digital signal processing (DSP) technology. Spawned by the introduction of personal computers and the compact disk, the electronic tools now exist to recreate the quality of real acoustic spaces, to create virtual rooms if you like.

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When Johann Wolfgang von Goethe called architecture “frozen music“, he must have been thinking of the great concert halls of Europe. These halls serve as performance venues for classical instrumental music as well as operas, choral works and ballets.

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line array systems
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