Chapter 2. Measurement
2.1. Concepts Underlying the Decibel and its Use in Sound Systems
Most system measurements of level start with a voltage amplitude. Relative level changes at a given point can be observed on a voltmeter scale when it is realized that(2.1)
which is only true if both values are measured at an identical point in their circuit. A common usage has been to remove the
exponent from the ratio and apply it to the multiplier.(2.2)
Bear in mind that the decibel is always and only based on a power ratio. Any other kind of ratio (i.e., voltage, ...
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