dbx DriveRack 220i - Manual (Page 23)

19
220i
DriveRack ® User Manual
Clear Live/All
This parameter clears the filters. If Clear Live is selected, then (if invoked) the live filters are reset. If
Clear All is selected, then (if invoked) all of the filters are reset. When either Clear Live or Clear All is
selected, the third parameter row displays “Start w/ Data Wheel.”
Mode - Live or Fixed
When the mode is Fixed, the algorithm updates only the fixed filters. When the mode is Live, the
algorithm updates only the live filters. In FIXED mode, the filters are automatically assigned to a
frequency creating feedback fixed filters that are stored remain with the program and at that frequency
until cleared by the user. Fixed mode is used before the performance without any input signal. In LIVE
mode, the live filters automatically detect and remove feedback during the performance. When all of
the live filters have been used, they begin to round robin. Essentially this means that the first filter set
is replaced where a new feedback is detected and notched out. This mode is useful because feedback
frequencies may change as the microphone is moved, and/or as the characteristics of the venue change.
Note- Only the fixed filter settings will be stored with the program.
Type - Speech, Low Music, Medium Music and High Music
Type allows the AFS algorithm to be customized for the application. The Values correspond to different
Q and sensitivity settings. Values are; Speech (Q=7.25), Music Medium (Q=29), Music High (Q=128).
NOTE: Because lower frequencies have longer wavelengths, it is sometimes more difficult to find the
exact feedback frequency; as a result the AFS algorithm will sometimes use a slightly wider Q filter to
notch low frequency feedback.
Total Number of Filters 1-12
This parameter selects the number of filters being used
Number Fixed - 0-12
This sets the number of fixed filters. This sets the number of Fixed AFS filters and ranges from 0-12.
This also sets the number of Live filters as the Total number of filters - number of Fixed Filters =
number of Live Filters.
Live Filter Lift (On/Off)
This parameter turns the Live Filter Lift on and off.
Lift After - 5 sec to 60 min
This parameter allows the user to setup the box so that the Live filters will automatically be removed
after a set time (as indicated by the “Lift After” parameter). It ranges from 5 seconds to 60 minutes. This
feature is useful if the microphone being used is moved or the characteristics of the venue change over
time. This feature removes unnecessary filters from the spectrum to increase sonic quality.
Virtual Highpass 0.00-410.1Hz
This parameter sets a highpass filter in the path of the AFS detector. There may be occasions where
the AFS algorithm is removing too much low end because it is being triggered by Synthesizer or Bass
notes that are not really feedback. This parameter provides a mechanism to make the AFS algorithm less
sensitive to low frequency thereby setting fewer filters in the bass region.
Detailed Parameters
Section 3