We have proposed the measure called booming level for evaluating booming sensation caused by car interior noise. In this measure, the scale was constructed by the arithmetic average of the weighted sound pressure level within specific frequency bands that contributed booming sensation. The weighting function was obtained by the subjective test using magnitude estimation. But this method had some difficulty to find out suitable frequency bands contributing booming sensation for calculation. In order to solve this problem, new method was introduced which based on the power summation of the weighted 1/3 octave band signals that was free from extracting specific frequency bands for calculation. This measure was named as Booming Index. As a result, good correlation was obtained between the subjective evaluation on booming sensation and Booming Index.
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