Factors influencing acoustic properties of buildings

In a building, the seats should be arranged such that they are along the circumference of an ellipse whose semimajor and semiminor axes bear a ratio 4:3. Walls should have an optimum reflecting power. Better you keep a parabolic reflector at the back of speaker with the position of the speaker at the focus of the reflector. Reverberation time should have an optimum value. To minimize echelon effect, always make steps of unequal width and cover them with some suitable absorbing material. Mufflers can be used to reduce the sound from systems containing a noise source connected to a fine pipe or suitable duct system such as air conditioning systems, fans, industrial blowers, gasoline and diesel engines, compressor and jet engine inlets and exhausts. There are two types of mufflers- reactive and dissiapative.