Coloring of sound quality is caused due to uncontrolled resonance. Anor cause of this defect is selective absorption. In order to remove this defect, wood panel absorbents are used which resonate over a wide range of frequency.

Concrete floor floating construction provides good insulation against impact sounds. In this type of construction, an additional floor is constructed and isolated from already existing concrete floor.

The average height for small halls should be 6 m while average height for large halls should be 7.5 m. The height is determined by various factors such as ventilation, presence of balcony, type of performance etc.

The Phon indicates level of sounds of equal loudness at all frequencies point for convenience, The Phon and decibels differ so slightly that y may be treated as synonyms.

There are three phenomenons that happen when sound waves strike surface of a room. These are reflection, absorption and transmission. The amount of sound transmitted outside a room depends on sound insulation properties of surface while amount of sound reflected or absorbed depends on surface.

Excessive reverberation is caused due to insufficient absorption. Reverberation is continuation of sound in space even after source of sound has been removed.

The rate of ventilation depends on both wind effect and stack effect. In ventilation due to wind effect, rate depends on direction and velocity of wind outside. In ventilation due to stack effect, rate is affected by convection effects.

The value of relative humidity is obtained by comparing dry bulb and wet bulb temperature. For higher temperatures, low humidity and greater air movements are necessary for removing greater portion of heat from body.

The rate of flow through an opening due to wind blowing on wall containing it is given by expression where Q = rate of air flow in m³/h, A = area of smaller opening in square metres, K is coefficient of effectiveness and V is wind speed in m/h.

When reflecting surfaces are situated at a distance greater than 17 meters or so and when shape of Auditorium is unsuitable, formation of echoes takes place. This defect can be removed by selecting proper shape of Auditorium and by providing rough and porous interior surfaces to disperse energy of a Echoes.