Extron electronic DMP 44 LC manual Parametric Equalizer, Parametric Filter Dialog Box, 1000 Hz

Parametric (Equalizer)

Up to three parametric filters can be placed in the filter box at one time. Each may be set to a different frequency creating a 3 band parametric equalizer. The control will boost or cut the center frequency, and by changing the Q value, the range of affected frequencies can be widened or narrowed around the center frequency. In general, the higher the Q, the narrower the affected bandwidth.

To demonstrate how Q affects the filter, see the following filter block below containing three parametric filters centered at different frequencies but with the same Q of 1.0. The filter in focus (B) has a center frequency of 1000 Hz boosting that frequency +12 dB over a Q of 1.0. Note the markers on either side of the peak frequency are at 200 Hz on the left and 5000 Hz on the right, a bandwidth of about 4800 Hz.

Figure 11. Parametric Filter Dialog Box, 1000 Hz

The above dialog box shows the frequency curve for the single active filter. To add its effect to the overall frequency response, remove the bypass on the other filters, as shown in the following illustration.

Figure 12. All Parametric Filters Active

The overall frequency response is now shown as a solid red line with the filter in focus, located in row 2, shown in the color of its table row.

DMP 44 LC • Operation 19