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Send questions or comments to doi. The decibel ( symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale, called the can be used to express a change in value ( e., + 1 dB or − 1 dB) or an absolute value. In the latter case, it expresses the ratio of a value to a fixed reference value; when used in this way, a suffix that indicates the. View and Download Chevrolet Captiva owner' s manual online.