dbx PX User Manual
Also see for DriveRack PX: Features & specificationsQuick start guideManual
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Contents
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Section 5 - Detailed ParametersThe DriveRack® PX offers complete editing flexibility, by offering in-depth control over everyparameter within each signal processing module. The following section will provide you withdescriptions and explanations of all parameters within the DriveRack® PX.5.1 Stereo Input Graphic EQEQ On/OffTurns the GEQ on and off.Flatten/RestoreThis parameter either flattens the GEQ or restores the GEQ to the last setting beforeflattening. The DriveRack PX unit allows you to leave the EQ edit window and return withoutlosing the edited EQ settings.Frequency (F) 31.5Hz to 16.0kHzThis parameter allows you to select any one the 28 available frequencies.Gain (G) -12 to +12 dBThis parameter allows you to adjust the level of any one of the 28 bands of the GEQ in 0.5 dBincrements.5.2 AFS (Automatic Feedback Suppression)Feedback is caused when a microphonic signal such as a guitar pickup or microphone isreproduced by amplification and is repeatedly picked up by the guitar pickup or microphone inphase. AFS uses Precision Frequency Detection and state-of-the-art processing to determinethe exact portions of a given frequency of your feedback that need to be removed (insteadof taking out large sections of your sound). The AFS module of the DriveRack® PX allows theuser to optimize the elimination of feedback. In the past, graphic equalizers were used toeliminate 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 1/3octave EQ slider was removing approximately half of the signal power. With the AFS, themodule removes the feedback automatically and the proprietary, precision AFS filters removeonly a fraction of the frequency spectrum. The following diagram shows AFS as opposed tocompetitive feedback eliminators and conventional graphic EQs. The widest filter shown is atypical 1/3 octave EQ band. The narrower filter indicates the typical bandwidth of competitors’filters. The narrowest filter is the dbx AFS filter. The narrow filter results in highly effectivefeedback suppression without compromising the sound.DriveRack® PX Section 5Detailed Parameters® |
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