Those who make the program, this is an experimental thesis. Pressure and level for audio frequency between the boiler room used cars exhaust sound absorption and reflection of the sound. Then find the equation for the calculation of the audio frequency and audio frequency is compared with the values measured from the lowest exhaust both pots. Using software to analyze an audio spectrum analysis to be used in reference to the exhaust system of the vehicle must be adapted to the audio frequency and the sound pressure level is lower than the value given by the Act, the following volume, while a travel engine, horn signal must not exceed the sound level 100 DB. When the measuring distance 0.5 m or 85 cars DB. When measuring 7.5-meter stage.
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