Definitions for "Cut-Off Frequency"
The frequency at which the gain of an amplifier or filter has fallen by 3dB.
Highest or lowest frequency in the pass band of a filter, highest or lowest frequency passed by an audio device (the cut-off frequency is usually considered to be the first frequency to be 3 dB lower than a reference frequency in the middle of the bandwid
the frequency point above or below that a filter strongly attenuates a signal. (Usually, the signal's output level at the cut-off frequency is 3 dB below its input level.) In a lowpass filter, a high cut-off frequency allows most of a sound through and generally produces a bright sound, while a low cut-off frequency blocks most of the sound and produces a muted or plain sound. See highpass filter, lowpass filter.