The document discusses the design standards for an auditorium building. It provides details on the types of auditoriums, basic design considerations, acoustic standards, and typical auditorium components. It then analyzes the National Museum auditorium based on these standards. The analysis finds that the auditorium's shape, seating arrangement, stage design, and materials used are generally in line with standard auditorium design. However, some improvements could be made to the horizontal circulation and location of the sound control room.

1. FIELD STUDY
PROJECT 03
GROUP 03
TOPIC : acoustic and viewing angle analysis of
an auditorium building
AUDITORIUM: NATIONAL MUSEUM auditorium
ROLL: 15.02.01.015
15.02.01.033
15.02.01.046
15.02.01.052

2. Auditorium is an enclosed indoor space, which has been developed from the classical open -air theaters.
An auditorium includes any room intended for:
-Listening to music or theaters.
-Classrooms
-churches
-Meeting halls.
INTRODUCTION
TYPES OF AUDITORIUM
For speech:
-Conference Hall
-Lecture hall
-Law Court
For music:
-Concert Hall
-Music practice room
Multi-purpose Hall:
-School Assembly Hall
-Town Hall

3. BASIC STANDARDS OF AUDITORIUM DESIGN
Determining shape, size and primary jot-down of seating
arrangements maintaining proportion
Includes the visual setting ,visual angle and acoustics of the
auditorium.
Speakers should produce a sound level at about 65 dB, everywhere
in the seating area.
Sound reflectors, speakers, roof system to be maintained.
Echo and electronic distortion must be avoided.
Proper entry and exit along with necessary stage ,green room and
fire exit facilities.

4. ACOUSTIC
STANDARD
In an auditorium there are 2 aims :
• Arranging ADEQUATE VISUAL FACILITIES FOR THE AUDIENCE.
•Supplying PROPER SONIC ENVIRONMENT.
MAIN OBJECTIVES OF AN AUDITORIUM DESIGN:
ADEQUATE VISUAL ARRANGEMENTS:
This includes:
• Shape of the auditorium.
• Seating arrangement pattern.
• Maintaining standard measurements for seats.
PROPER SONIC ENVIRONMENT:
This includes:
• Acoustic environment or the environment of wanted sound
• Preservation of natural quality of the speakers quality.
• Audibility and intelligibility for every members of the
audience.

5. SHAPES OF AUDITORIUM
The Proscenium shape
A proscenium is a shape in which the audience faces the
performing area on one side only and sees the performing area through
an architectural opening that often has an elaborated architectural frame.
The Arena Shape
This arrangement puts the greatest number of the audience in intimate proximity with
the performer. Both the audience and actor are in the same room.
The Apron Shape
When an apron or forestage is only an adjuscent to a proscenium stage, it should not be considered a thrust stage
The Open Thrust Shape:
A true thrust stage is a platform extending into an open auditorium in which the auditorium truly surrounds the stage on three sides. There may be
exits in the back of the stage, as well as under the audience through Vomitory tunnels .
STANDARDS OF AUDITORIUM:

6. STANDARDS OF AUDITORIUM:
An auditorium in generally composed of the following parts.
1. FRONT OF HOUSE:
•Lobby,
•Box Office,
•Marquee.
2. HOUSE:
•Orchestra Pit,
•Audience seating,
•Catwalks,
•Control Booth.
3. STAGE:
•Performing Space,
•Proscenium,
•Prompt Corner,
•Rake,
•Safety Curtain,
•Smoke Pocket,
•Wings.
4. BACK STAGE/OFF STAGE:
•Dressing rooms,
•Green room,
•Cross over,
•Fly system,
•Trap room,
•Dimmer room/Mechanical Room.
Fig: Parts of auditorium Fig: Parts of Stage

7. STANDARDS FOR A GOOD VISUAL SETTING & ACOUSTIC ARRANGEMENTS OF AUDITORIUM:
According to standard the angle of vision should be 100 deg horizontally and 30 deg vertically.
Height of the first step should be minimum half to the height of the stage
Fig: Vertical Angle of vision.
Fig: Horizontal Angle of vision from different corners.
Fig: Horizontal Angle of vision.
Fig: Horizontal Angle of vision.
100

8. STRAIGHT
ROW
STRAIGHT, CANTED SIDE-
BANKS
CURVED
ROWS
TYPES OF ROWS IN AUDITORIUM
*Straight row.(poorest type)
*Compound row.
*Curved row.
*Fan Row(Ideally best)
*Oval shaped Row etc.

9. FLOOR LEVEL/ STEPS:
This can be of 3 types:
•Level Floor
•Inclined Floor
•Stepped Floor
In most auditoriums inclined or
inclined or stepped floors are designed.
designed.
•Stepped floor is a better solution for it.
solution for it.
LEVEL FLOOR INCLINED FLOOR STEPPED FLOOR
Fig: Details of Seat measurements
Fig: Details of Seat measurements
Fig: Details of Seat measurements
Fig: Details of Seat measurements

10. DESIGN CRITERIA FOR GOOD ACOUSTICS IN AN AUDITORIUM:
• Every audience can clearly hear and understand the sound
•The natural quality of the speakers voice should be preserve
•Avoidance of strong echoes & focusing of sound rays.
•Intimacy
• Clarity
• Reduction of sounds & vibrations
•Proper reverberation time
•Echoes, flutter echoes, sound focusing , sound shadows and
•Background noise should be avoided in an auditorium design.
•The greater the early decay time (up to two seconds ), the greater the
preference for the concert hall. Above two seconds ,the trend it reversed.
Fig : Sound Shadow Fig : Echoes
The total sound level in any auditorium is made up of two parts:
• The direct sound
• The reverberant sound

11. In order to reach these goals 2 steps can be taken :
 Best use should be made for the limited amount of acoustic power available.
 There should be an absolute minimum of back ground noise.
PROBLEMS IN ACOUSTICS DESIGINING:
• Lots of sound ,but little is heard
A sound wave start at the loud speaker and only 0.17% of the
sound is directly heard by the audience.
• Noise blocks our ability to hear
the auditorium is meant for understanding speech . Noise destroys
sonic clarity.
• Background noise
Background noise is all the sounds one hears when the lecturer is not
Saying something.
• Acoustic noise, echoes and reverberation
To avoid corner eco steps can be taken as :
Fig :1 Fig:4Fig:3Fig:2

12. There are two basic types of materials for acoustic treatment –
1. absorbers
2. diffusers.
DIFFUSORS AND ABSORBERS
•Diffusers are used to reduce or eliminate repetitive echoes that occur in rooms having parallel walls and a flat
ceiling.
•Diffusion is often used in addition to absorption to tame these reflections.
•Such treatment is universally accepted as better than making the room completely dead by covering all of the
dead by covering all of the walls with absorbent material.
• The ideal listening room has a mix of reflective and absorptive surfaces, with no one large area all live or all dead
large area all live or all dead sounding.
STANDARD MATERIALS FOR AUDITORIUM
Curved absorber
Flat absorber
Absorber

13. NATIONAL MUSEUM AUDITORIUM

14. TRANSPORTATION
WAY

15.  waiting space serves both waiting for visitors and
connects the entry, exit, fire exit, wash room and other
facilities connecting by lobbies.
•two doors to enter in the auditorium
the doors are each 5’ wide.
•fire exit is on the back of the stage.
the main entry is inviting having a door 7’ wide.
•after the main lobby area comes the secondary lobby.
•a stair case connects the secondary lobby(ground
floor) & waiting space(first floor).
•auditorium is on the 1st floor.
Fig: BUBBLE-DIAGRAM showing functional
connections to the auditorium
AT A GLANCE

16. ENTRY,RAMP & PARKING

17. GROUND FLOOR PLAN

18. PLAN ANALYSIS OF AUDITORIUM
BACK ENTRY
BACK STAGE
PROJECTION ROOM
SITTING AREA
ENTRY
STAGE
MAKEUP ROOM
STORAGE
KITCHEN

19. SOUND REFLECTION IN AUDITORIUM
DIRECT
SOUND
REFLECTED
SOUND
OVERPAYING
REFLECTED
SOUND

20. FOR ACOUSTIC
Wanted area
WANTED AREA
UNWANTED AREA
UNWANTED AREA

21. HEIGHT ANALYSIS
SOUND REFLECTOR
TRUSS
SITTING
STAGE

22. SITTING ARRANGEMENTS
HEIGHT DIFFERENCE BETWEEN TWO ROW IS 1FEET.
STAGE HEIGHT FROM PLINTH LEVEL IS 2 FEET 6 INCH.
THE MESSUREMENTS ARE ACCORDING TO STANDARDS.
Fig: Section of sitting place

23. ANALYSIS OF LOCAL SURVEY ON THE BASIS OF STANDARDS OF AUDITORIUM
SOURCES LOCAL SURVEY STANDARD COMMENTS
SHAPE & SIZE Shape=curved
Height =21 ft
Floor:2300 sq.ft
Can be used for
music , drama
plays , seminar
and dance
Follows standard
ENTRY TO THE
AUDITORIUM
1 entry ,
5’ wide ,
serves 360 people.
1m wide per 150 person. Follows standard
STAGE •Proscenium is at the back of stage of white color.
•After the proscenium cross over of 5’ width connects the green rooms and
the green rooms and cultural background purpose.
•A platform of 2’6” ft height for cultural purpose like background drama,
background drama, shadow dancing etc.
PARTS OF STAGE:
•Performing Space,
•Proscenium,
•Prompt Corner,
•Rake,
•Safety Curtain,
•Smoke Pocket,
•Wings.
Follows standard

24. ANALYSIS OF LOCAL SURVEY ON THE BASIS OF STANDARDS OF AUDITORIUM
SOURCES LOCAL SURVEY STANDARD COMMENTS
SEATING
PATTERN
(Ground floor)
This seating arrangement can hold 360 people at a time.
Inner part of this auditorium consist of 3 parts
• Ground Floor- 2300 sqft
• 2 bays. Each contains=12 rows
Total seating = 360
Each step is 6” high.
Distance between two bays – 5’
• Green room and service
Seating can be in three bays. 25 seats per aisle is permissible
aisle is permissible ,if one exit of 1m width provided with 3-4
provided with 3-4 rows.
SIMILAR TO STANDARD

25. SOURCES LOCAL SURVEY STANDARD COMMENTS
SEATING PATTERN
(Ground floor)
ROOF
TREATMENT
• Distance between 2 audiences- 2 ft
• Distance between entry to last seat- 3 ft.
• Height of steps- 6”
• Trusses are used as structure for the roof
• Lights and fans are hanged from the traces
• Lights for both stage and
audience area.
• Ventilating and sound system
on the roof for proper acoustics.
•Angle between two truss is 120 degree keeping the distance of 1m
Slight dissimilarity
FOLLOWS STANDARD
ANALYSIS OF LOCAL SURVEY ON THE BASIS OF STANDARDS OF AUDITORIUM

26. SOURCES LOCAL SURVEY STANDARD COMMENTS
MATERIALS Floor is made of mosaic but
open portion is
covered with carpet.
•Stage covered with
jute carpet.
•Wall surface is covered
with jute particle
and composed with
absorbing material.
•After the outer layer there
is the brick wall façade.
SIMILAR TO
STANDARD
EXIT The entry is used as the exit.
Width- 5’
Height- 7’
1m wide per 150 person SIMILAR TO
STANDARD AND
PURPOSE IS SERVED
WELL
Section of wall
Brick wall
Buffer space
Jute partials
Floor Walll
ANALYSIS OF LOCAL SURVEY ON THE BASIS OF STANDARDS OF AUDITORIUM

27. stage Entry to the auditorium

28. Positive side
• Ramp and parking are well solved by following standards.
• Horizontal and vertical circulation are well organized for the building purpose.
• Brick and concrete are used for Building materials which is good for our climatic condition.
climatic condition.
• Roof terrace give the feelings of green and nature.
• The artificial light system is good accurate for viewers.
Negative side:
• Horizontal circulation is not enough for school purpose.
• Sound control room is behind the column that spoil the vision of controller.