Filtering and Notch Control for Noise Problems
The high pass and low pass filters are the core of the NF575. You can choose slopes of 6, 12, 18, 24, 30 or 36 dB per octave and set the cutoff anywhere in the audible range. Steep slopes remove rumble or hiss with a sharper edge, while gentler slopes keep the change more subtle.
The five notch filters target narrow bands. For each one you set the amount of signal cut, the center frequency and the width. Linking the notches harmonically lets you address cyclical noise, such as 60 Hz hum and its multiples, with a single set of adjustments.






