Ashly nX8004 Operating Manual page 26

Operating Manual - nX, nXe, and nXp Power Amplifiers
Threshold Below Target - Determines the relative input signal level above which the Autoleveler increases gain, below which
no action is taken.
Ratio - This is the ratio of the input level change in dB to output level change in dB. It determines the degree of boost or cut
applied to a signal to maintain the target level. The higher the ratio, the closer the signal (above threshold) will approach the
target level. However, a higher level will also increase how aggressive the Autoleveler will maintain that gain.
Gain Change Rate - Prevents sudden, choppy-sounding level changes to an input signal having a wide dynamic range.
Hold Time - This is the time after the input signal falls below the threshold during which the Autoleveler's gain is held con-
stant before it returns to unity gain. Hold Time is used in conjunction with gain change rate to arrive at a natural-sounding auto
leveler action.
Both the Advanced and Basic control views have a visible meter bar. It shows the gain or attenuation applied by the auto leveler
in 1 dB steps.
Ducker
The Ducker is used to attenuate the level of selected channels when one or more "Trigger"
channels has signal preset. This is typically used in paging applications where a common
input signal such as background music needs to be attenuated when signal is applied to a
specific channel (e.g., a paging microphone).
Parameters
Ducker Type - Available types are High and Low Priority Trigger, Filibuster, and Ducked
Program.
Trigger Threshold - The signal level on a trigger channel at which point all ducked
program channels are attenuated.
Ducking Release - This determines the time the ducked program stays attenuated after
the trigger input signal has fallen below its threshold.
Ducking Depth - Determines how much attenuation is applied to input channels set for
ducked mode.
Duck At Mixer(s) - Disables any attenuation being applied to the input and enables the
ability for each output channel's matrix mixer to apply the attenuation.
Ducker Types
High Priority Trigger - When signal is present on this channel, all channels set to "Ducked Program", "Low Priority Trigger"
and "Filibuster", attenuated to -Inf. (Muted).
Low Priority Trigger - When signal is present on this channel, all channels set to "Ducked Program" will be attenuated by the
depth specified on that channel. All channels also set to filibuster will be attenuated to -Inf. (Mute).
Filibuster - When signal is present on this channel, all channels set to "Ducked Program" will be attenuated by the depth speci-
fied on that channel. All channels also set to Filibuster are attenuated to -Inf. Only one Filibuster channel is allowed to be above
the threshold at any given time, the rest are fully attenuated. The filibuster input does not allow other signals to return to normal
until half a second after it has fallen below its threshold.
Ducked Program - Sufficient signal present on any Trigger Channel will cause this channel to be attenuated by the specified depth.
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