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# Mid Notch Filter

A Mid Notch filter is a parametric mid filter that can work on any frequency of the audio signal (20 Hz to 20 kHz). There are four available mid filter nodes for you to use. A notch filter fully limits the specified frequency range regardless of the gain setting. It is often used to reduce the 50 Hz or 60 Hz hum originating from the power source, while having little noticeable effect on the rest of the frequency spectrum. By specifying a frequency for the mid EQ, you can set the target frequency. Use the Q curve to determine the range of frequencies affected. The default Mid Notch filter setting is 1000 Hz with a Q value of 2.0.

The following diagram illustrates the result of using a Notch filter at the specified frequency of 1000 Hz with higher Q setting of 4.00.

The following diagram illustrates the result of using a Notch filter at the specified frequency of 1000 Hz with lower Q setting of 0.50.