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mid frequency 20 Hz - 44 kHzbandwidth „Q“ 0,1 - 20BSNotch FilterThe notch filter filters out a frequency range defined by the mid frequency and thebandwidth. With a “Q” factor above 5 this filter is very narrow, allowing the user tofilter out unwanted frequencies (i.e. mains hum at 50 Hz and certain harmonics)completely. With a “Q” factor below 5 the filter response is quite wide but this set-upis seldom used in professional audio systems.mid frequency 20 Hz - 44 kHzbandwidth „Q“ 0,1 - 20