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The theatre of Epidaurus and its extraordinary acoustics

March 14, 2015 by Mike 3 Comments

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The theatre of Epidaurus (Greece) is one of the best preserved ancient theatres, dating back to 4th century B.C, and is world famous for its exceptional acoustics. I had to go and get the mic to do a recording (video below)…

epidavros-theatre-greece
The ancient theatre of Epidauvrus – photo by Martina Di Fresco

There’s loads of interesting stuff round this area of ancient Epidaurus, but I’ll just show you the coolest bit: the acoustics of the theatre.

  1. Discovered under a layer of earth and excavated in 1881
  2. Dates back to 4th century B.C
  3. An audience of 15000 are able to hear musicians and actors un-amplified – even from the back row (60m away)
  4. The acoustic properties have been a bit of a mystery for a while but were recently solved by some guys at Georgia Institute of Technology (read more here)

Here’s what the theatre of Epidaurus sounds like:

How does it work?

The theatre, due to its shape, is an amplifier. The interesting thing is that it only amplifies certain frequencies which happen to be just the right ones – it’s not really known if this was intentional.

It’s the steps – they form an efficient acoustic filter which minimises background noise and amplifies the actors and musicians.

epidavros-theatre-seats-filter

All sound below the frequency about 500Hz (like the unwanted sound of the audience and the wind) get absorbed whilst frequencies above this cutoff value (like an actors voice) get reflected and amplified through the theatre. This does cut out some of the lower end of an actors voice but works because of the ‘virtual pitch’ phenomenon where the brain fills in the missing frequencies.

The theatre actually increases the signal to noise ratio resulting in a high clarity of sound which can be heard on the very back row

Did the Greeks know this?

I reckon watching a performance here would be really good. The location is also pretty amazing – right on the side of a mountain, surrounded by trees

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Filed Under: Living and travelling in a van Tagged With: greece, travel

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