![]() The filter output is simply accessed across the resistor instead of the capacitor. A sound 1,000 times more powerful than near total silence is 30 dB, 40 dB and so on. A sound 100 times more powerful than near total silence is 20 dB. Note that because the same resistor and capacitor were used, the cutoff frequency has not changed. The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). On the decibel scale, the quietest audible sound (perceived near total silence) is 0 dB.
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