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The cutoff or corner frequency of a filter is the point at which is starts filtering. For example, if a low-pass filter has a corner frequency of 500 Hz (cycles per second), all harmonics or other sound components below 500 Hz will be allowed through untouched, and all harmonics above 500 Hz will be “filtered” – reduced in loudness – the further above 500Hz you go.

Similar:
center frequency
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