auditorium

Acoustical considerations in the

Architectural Design of

Musical Auditoriums

Presented by

Ar.Jaiku

mar Ranganathan

Lecturer

Dept of Architectu

re,HCE

Chennai,India

Acoustical considerations

Since no music hall is built for one specific type or style of music, the RT must be a meticulously established compromise. A carefully controlled RT will increase fullness of tone and will help loudness, definition, and diffusion.However,the establishing of an ideal RT alone is no guarantee that a hall will be acoustically excellent for the performance of music; it is a contributing factor only.

Acoustical considerations Definition will be satisfactory if the initial time-Delay gap does not exceed 20 msec; if the direct sound is loud enough relative to the reverberant sound, that is, listeners are are reasonably close to the sound source; and if there is no echo.

Providing an adequate supply and distribution of bass tones over a large audience area( above 2500 seats) is a serious acoustical problem, in part because the fundamentals of several musical instruments are relatively week and most of the time only their harmonics are heard.

Acoustical considerations

To achieve uniform quality of sound over the entire seating area balconies should not protrude too deeply into the air space of the room; listeners should have unobstructed sight lines so that they receive ample direct sound, the should be of reasonable size and proportion, and concave enclosures should be avoided.

Acoustical considerations

Echo will be particularly noticeable if the RT is short and diffusion is inadequate. The longer the RT in a room, the less trouble can be expected from echo. The longer RT will cover up the single intrusions of an echo. In checking echo-producing spots, it should always be borne in mind that the acoustical design of rooms is a three dimensional problem.

Acoustical considerations

The frequencies of sounds involved in the acoustics of music halls extend over a considerable wide range than those for speech, from about 30 Hz for certain musical instruments to about 12,000 Hz, including those high-frequency components of musical sounds which characterize some musical instruments.

Acoustical considerations

Particular attention is required to control noises and vibrations originating from the heating, ventilation and air –conditioning system; from nearby spaces; mechanical and electrical rooms; and from surface, underground, and air transportation.