Dbx DriveRack 220i User Manual download pdf (Page 23)

Detailed Parameters

Section 3

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 dur-

ing 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 some-

times 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 characteris-

tics 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.

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Dbx DriveRack 220i User Manual Page 23

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