Pre-Crossover Graphic Eq - dbx DriveRack Studio User Manual

Section 4 Section 4
4.1 Pre-Crossover
4.2 Feedback Eliminator
DriveRack Studio User Manual
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Detailed Parameters
The DriveRack Studio offers complete editing flexibility, by offering in-depth control over every
parameter within each effect module. The following section will provide you with descriptions
and explanations of all parameters within the DriveRack Studio.
The DriveRack Studio's Pre-Crossover EQ section may be configured as a single or linkable 28
band graphic EQ.
EQ On/Off
Turns the GEQ on and off.
Flatten/Restore
This parameter either flattens the GEQ or restores the GEQ to the last setting before flattening.
The DriveRack unit allows you to leave the EQ edit window and return without losing the edit-
ed EQ settings.
Frequency (F) 31.5Hz to 16.0kHz
This parameter allows you to select any one the 28 available frequencies.
Gain (G) -12 to +12 dB
This parameter allows you to adjust the level of any one of the 28 bands of the GEQ in .5 dB
increments.
In addition to being a great piece for studio applications, the DriveRack Studio is perfect for
live applications, and AFS mode is the perfect tool for eliminating feedback. the The DriveRack
Studio is the first product in the dbx family to offer the exclusive patent pending AFS (Advanced
Feedback Suppression) feedback elimination module. Feedback is caused when a microphon-
ic signal such as a guitar pickup or microphone is reproduced by an amplification and is repeat-
edly picked up in phase. The AFS uses Precision Frequency Detection and state-of-the-art pro-
cessing to determine the exact portions of a given frequency of your feedback that need to be
removed (instead of taking out large sections of your sound). The AFS module of the DriveRack
Studio allows the user to optimize the elimination of feedback. In the past, graphic equalizers
were used to eliminate feedback from a system. This was an acceptable method for eliminating
feedback, but when this method was precision tested, the result clearly showed that a single
1/3 octave EQ slider was removing approximately half of the signal power. With the AFS, the
module removes the feedback automatically and the proprietary, precision AFS filters remove
only a fraction of the frequency spectrum.
competing, competitive feedback eliminators and conventional graphic EQs:
AFS On/Off
Turns the AFS module on and off. If AFS is Off, the filters are bypassed, and the algorithm is
halted (the filters are not updated). If AFS is On, the filters are active, and the they are updat-
ed according to the current selected mode (Fixed or Live).
DriveRack
The following diagram shows AFS as opposed to
dbx AFS
Conventional Feedback Elimination
Graphic EQ
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Studio
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