This chart shown below represents the influence of all Biquads on the frequency and phase response. The left axis indicates the amplitude in dB, and the right axis shows the phase in degrees.
EQ Chart in EQ Panel
The number of Biquads are defined with the Signal Flow Designer. The Biquads get dynamically managed inside the GTT. Most of the Biquads are represented by appropriate markers.
These Markers are movable. Moving them allows you to amend the current Biquad parameters. Each marker corresponds to one or two Biquad parameters. For example, the equalizer shown below has three markers.
HINT-TO-EDITOR: Wrong image; needs additional signature, see original document!
The Biquad settings will allow you to:
- change the Frequency, Gain and Quality
- Change/remove a Biquad
Frequency is used to set the center frequency of each filter.
Gain is used to set the center frequency gain of each band of the filter. Not all filter types offer a variable gain.
Quality is used to set the width of each band pass or notch type band of the filter. Not all filter types offer a variable quality factor.
The Biquad Filter Menu shows a list of all Biquads that are set up in the amplifier for the current channel. You can change the Biquad type or remove the Biquad by setting it to Bypass (at top of the list).
You cannot add new filters to the EQ Panel. All available filters are added and bypassed at panel startup.