Extron electronic Extron Electronics Music Mixer DMP 64 Manuale Utente

By increasing the Q to 10.000, the center frequency remains the same. The markers show 
the bandwidth of the filter narrowed to between 900 Hz and 1200 Hz, or about 300 Hz 
(see figure 30). Parametric filters can be used to notch out a very narrow, or very wide 
range of frequencies using the Q setting.

The dialog window above shows the frequency curve for a single active filter. To add its 
effect to the overall frequency response, remove the bypass on the other filters.