amphitheatre requirement according to isi standards andinternational standards

1. Amphitheatre

3. • Amphitheatre Design details :
• Selection of site is a critical point- topographical,
meteorological and acoustical properties should be taken
into consideration.
• Slope of seating should not be less than 12 degrees, for
better audibility n visibility.
• Noise level should not exceed 40 to 50 decibel.
• Seating arrangement speaker Sound reflection.
• An outdoor theater with a semi-circular, fan-shaped, or
elongated auditorium facing a grass, masonry, or wooden
stage.
• While there are a number of factors that go into
determining the stage height, including types of
performances, seated or standing audience, venue shape
and size, here are some rules of thumb for determining
stage height:
• Up to 100 spectators – 8” to 16” high
• 100 to 300 spectators – 16” to 24” high
• 300 to 500 spectators – 24” to 32” high.

4. r

6. INDIAN STANDARD CODE Of PRACTICE FOR ACOUSTICAL DESIGN OF AUDITORIUMS
AND CONFERENCE HALLS
• Stage Used for Speech and/or drama - The clarity of speech is most important in this case. Optimum clarity depends on:
• a) correct reverberation time,
• b) absence of echo,
• c) correct loudness level at all parts of the hall, and
• d) low background noise.
• Precaution should be taken while designing
• Prevailing noise conditions should not exceed 45 dB on 'A' scale. Wind velocities naturally experienced at site should not exceed 16 km/h.
• Back stage wall should be made reflective and broken into convex shaped surface. Overall shape should be flat in plan; however, if it is
desired to be concave, it should be broken into convex surfaces which in either case should be of at least 90 to 180 cm width.
• If direction of wind generally remains the same, the auditorium should be so located that wind direction is towards the audience from the
stage.
• In case the number of audience exceeds 600 or back ground noise is more than 45 to 50 DB . The loudspeaker system should be so
designed that it is capable of providing an average level up to 80 dB over the entire listening area.
• Absorbent material should be distributed evenly over the wall surfaces of the stage.