The Parametric EQ block (PEQ) provides a low-cut and high-cut filter, and up to 15 parametric bell filters. The 2nd-order Butterworth high-cut and low-cut filters are useful for band-limiting audio to a specific frequency range. Each parametric filter is a bandpass type with equal response on either side of the center frequency. It can be used as a notch filter with high-Q settings (narrow BW) for feedback elimination, with low-Q (wide BW) settings for broadband EQ, or anything in between. Parametric filters provide from +12 dB of boost to -15 dB of cut, with an adjustable center frequency (20 Hz – 20 kHz) and bandwidth (0.015- 4 Octaves). All filters have a bypass control to disable the filter’s effect on the frequency response of the block.
tip: If you are using the Parametric EQ block to manage the frequency response of a space with multiple uses, you may find it necessary to save its settings in a preset and then recall different presets as the space changes. Once you’ve got a set of EQ settings stored in a preset, reconfigure your room for its next use and click the Flatten All button to quickly return to a flat frequency response.
note: A bypassed filter’s Frequency/Gain and Bandwidth responses and handles are hidden in the graph. By default the graph only displays the composite magnitude response (the total result of every filter in the block).
|Input node||Connection point for wiring input to the Parametric EQ block|
|Output node||Connection point for wiring the Parametric EQ output to another block|
|x 1||Indicates the total number of Parametric EQ filters in the block|
(Hover over the thumbnail below to view the properties dialog box.)
|Graphical representation of filters. Use the green/brown handles to adjust a filter's gain and frequency, and the purple handles to adjust a filter's bandwidth. Gain and Bandwidth controls are only available for bell filters. Use View options to change graph content.|
|View options||Selecting Magnitude (selected by default) displays the filters' Magnitude on the graph. Selecting Phase (deselected by default) displays the filters' phase response on the graph. Selecting Composite (selected by default) displays frequency/gain handles for all filters on the graph. Selecting Individual (deselected by default) displays the individual contribution of the selected filter.|
|Add Filter/Remove Filter||Click to add/remove the selected bell filter from the graph.|
|Flatten All||Click to return to a flat frequency response.|
|Frequency control||Displays the current frequency of the selected filter. Change the frequency by moving the slider or editing the frequency value in the edit box.|
|Gain control||Displays the current gain of the selected filter. Change the gain by moving the slider or editing the gain value in the edit box.|
|Bandwidth control||Displays the current bandwidth of the selected filter. Change the gain by moving the slider or editing the gain value in the edit box.|
|Bypass (above Table View)||Selecting this checkbox bypasses the selected filter, which effectively turns the filter into a wire.|
|Filter Table View||Displays the Frequency, Gain, and Bandwidth for each parametric filter. Displays the Frequency, Type, and Slope/Order for each cut filter.To select a filter, click its row in the table. You can also bypass a filter by selecting its associated Bypass checkbox. You can show or hide this table view by clicking the Show/Hide arrow above the table.|
|Bypass All||Selecting this checkbox bypasses all filters.|