4/11/2024 0 Comments Decibels logarithmic scaleBehold, we now have a signal which is at line level (see article on Audio Levels).Ĭonsequently, we could say that the level of the microphone signal is -60dB compared to the amplified line level. Therefore, a pre-amp with a gain of 60dB is going to amplify our 1mV mic level signal by a factor of 1000, giving us a level of 1,000 millivolts or 1 volt. From the table above, we see that 60dB is equal to a linear ratio of 1000. We plug this microphone into a pre-amp (microphone input on a camera or mixer) that has a gain of 60dB. Let’s say we have a microphone that is giving out 1 millivolt (that is, a thousandth of a volt) when we speak into it. I know it can be hard, but stay with me here, a few more examples should help. If is it -6dB, then it is half the size it was before. If the voltage is +6dB, it is twice the size as it was before. These examples also show that it is possible to have positive and negative decibels. So, we could say the output is now -6dB (below what it was before). This means we are halving the voltage (because 6dB is a factor of 2). Remember decibels are always relative to something, in this case, to what it was before we doubled (added 6dB to) the level.Įxample Two: same scenario, but this time we lower the volume by 6dB. That is, relative to what the level was, it is now 6dB higher. Otherwise, just skip the calculator and read the examples below to help understand how decibels are used.Įxample One : you increase the volume on a mixer or amplifier by 6dB: this is actually doubling the voltage that will appear at the output (because 6dB is a factor of 2 – see table).
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