![]() Having a good understanding of these ideas will speed up your mixing process substantially by fine-tuning your isomorphic mapping abilities. A 6dB change is perceived as a significant change in level and 10dB to 12dB can be heard as a doubling or halving of loudness. Most people begin to hear a slight change in level at plus or minus 2dB to 3dB. 0dBFS is the absolute peak in a digital system after which samples will be clipped. The levels commonly found on a track in a DAW are dBFS or Full Scale. But if we compare it to some level we’ll call 0dBSPL, we can say that it is roughly half as loud. For example, -12dBSPL by itself is meaningless. So decibels express amplitude or loudness levels as a value relative to some reference value or beginning value. A linear scale would be far less intuitive in terms of frequency or amplitude. This human perception is best visualized using a logarithmic scale so the physical distance on the graph between various octaves (e.g. In fact, we hear the distance between 200Hz and 400Hz as the same, which is the interval of an octave or a doubling of frequency or a 2:1 ratio. Although the numerical distance between 100Hz and 200Hz is the same as that between 200Hz and 300Hz, we do not hear that distance as the same. Find more explanation of logarithms here. ![]() This is a logarithmic scale based on powers of 10. For instance, from 100Hz to 200Hz is spaced farther apart than is 200Hz to 300Hz. Note that the vertical lines represent frequency values that do not look equally spaced. Consider the layout of a parametric EQ seen below. ![]() This might best be understood in terms of our perception of frequency. Linear scales represent a change in values as a difference, whereas logarithmic scales represent changes as a ratio. Human hearing is best measured and represented with a logarithmic scale as opposed to a linear scale. In other words, decibels are relative as opposed to absolute units. ![]() The Decibel is a logarithmic unit that expresses value in relation to another value. Most amplitude measurements use decibels in one form or another. Key to this is understanding the decibel (dB). In working with sound it is essential to have a firm grasp of amplitude and loudness and the various methods of measurement. ![]()
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