Abstract
The author, a consultant in architectural acoustics, became interesting in the vast differences in interior noise levels between passenger cars in today's market. Octave‐band noise levels were measured in 20 different automobile models. In order to reduce the number of variables, the measurements were limited to the driver's position with the car stopped and engine at idle. In the 31‐Hz band, noise levels varied 20 dB between two different models by the same manufacturer. The range of A‐weighted levels spanned only 8 dB. While the A‐weighted sound levels as published by most consumer magazines provide some indication of relative loudness, examination of octave‐band levels shows radical differences between models. Some observations and conclusions are drawn by an “enlightened” consumer.
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