+**3 dB** marks a significant shift: a halving or doubling of power, or a noticeable change in signal amplitude. It is a critical point in [Electrical Engineering](/wiki/electrical_engineering) and [Acoustics](/wiki/acoustics), often defining the edge of a system's effective range. This small number holds great meaning for filters, amplifiers, and communication channels.
+## See also
+- [Decibel](/wiki/decibel)
+- [Gain](/wiki/gain)
+- [Bandwidth](/wiki/bandwidth)
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