DiGiCo SD Series - Manual (Page 26)

Chapter 1 - Channel Types
1-19
Dynamic EQ
In a dynamic EQ module, the EQ adjustment is applied dynamically, based on the level of the incoming frequency relative to a
predetermined threshold. Dynamic EQ is accessed by touching the red "Delta" symbol on any EQ band. Activate the dynamic
function by pressing the dynamic on button (a red ring will appear in the button). When dynamic EQ is active, you can also mute
and unmute the entire EQ band by pressing the band on button (a red ring indicates that the band is unmuted).
When any dynamic EQ bands are on, a dynamic EQ icon appears above the EQ graph in the channel strip (as shown on the
previous page). The four boxes beneath the icon indicate the status of each band – each box is empty (light grey) when the band
dynamics are off, dark grey when the dynamics are on but the band is off, and coloured when the dynamics and band are on.
DiGiCo dynamic EQ can operate in two modes: 'over' or 'under':
Over Mode
To place the dynamic module into Over mode, ensure that the Over indication below the threshold control is not illuminated.
When the signal entering the module passes the threshold, the EQ adjustment (as determined by the frequency and Q controls)
starts to be applied, up to a maximum adjustment, determined by the EQ band gain control. The manner in which the EQ adjustment
is applied once the threshold has been reached is determined by the attack, release and ratio controls.
Gain : Sets the maximum EQ adjustment that could be applied
Frequency / Q / Curve : Adjusts the EQ characteristics
Threshold : Sets the threshold at which the EQ starts to be applied
Attack : controls how quickly the dynamic module responds to level passing the threshold
Release : adjusts how quickly the module responds to a fall in level
Ratio : controls how quickly the maximum adjustment is reached once the threshold level is passed.
Over Mode is generally used with a reduction in gain at a specific frequency, such that when the threshold is reached, a gradual
reduction of level at that frequency is applied. This could be used to control a change in tonal characteristics as a singer pushes
their voice to sing louder.
Under Mode
To place the dynamic module into Under mode, ensure that the Over indication below the threshold control is illuminated.
In under mode, the maximum EQ adjustment (as determined by the frequency, Q and band gain controls) is applied when the signal
entering the module is below the threshold. As the signal level approaches the threshold, the EQ adjustment is reduced to the point
where there is no EQ being applied at the threshold. The manner in which the EQ adjustment is reduced as the signal level
approaches the threshold is determined by the attack, release and ratio controls.