Harman 4820 Type switch, Detector Highpass fader, Sensitivity fader, Live Filter Lift switch

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Section 6

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Detailed Parameters

 

Type switch

The Type switch toggles the AFS function between different sensitivities and filter Q settings corresponding to the type of application. The different Types are Speech (Highest Sensitivity, Bandwidth = 1/5 octave and Q=7.25), Music Low (High Sensitivity, Bandwidth = 1/10 octave and Q=14.5), Music Medium (Medium Sensitivity, Bandwidth = 1/20 octave and Q=29), and Music High (Lowest Sensitivity, Bandwidth = 1/80 octave and Q=116).

Detector Highpass fader

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. These waveforms can be tricky because the notes will not only appear to be feed- back to the algorithm, they will also cause the filters to widen out because they appear like several feedback frequencies closely located to each other. This Highpass parameter provides a mechanism to make the AFS algorithm less sensitive to low frequencies (thereby setting fewer filters in the bass region) and is adjustable between Off, 11.7 - 410.1Hz.

Sensitivity fader

The AFS algorithm is very effective when the audio has a nominal level of 0 dBu. However, if the audio is too low in level the AFS algorithm may not catch feedback as quickly as possible. By increasing or decreas- ing the sensitivity you can adjust for audio that is either too loud or too soft and help the AFS function properly. The Sensitivity fader can be adjusted between up to +/- 20dB.

Live Filter Lift switch

This parameter turns the Live Filter Lift functionality on and off.

Lift After fader

In Live mode the AFS filters offer Live Filter Lift which can remove extraneous filters. This parameter sets the timer length for the live filter lift. Once a filter’s timer has run out, the algorithm checks to see if the filter is still necessary. This timer ranges from 5 seconds to 60 minutes.

Number Fixed fader

This parameter sets the number of Fixed AFS filters. This also sets the number of Live filters; the total number of filters minus the number of Fixed Filters equals the number of Live Filters. The number of Fixed filters can range between 0 and 12.

Total Filters fader

This parameter selects the total number of filters available and can range between 0 and 12.

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Contents 4800/4820 Importantsafetyinstructions Important Safety Instructions DriveRack Table of ContentsDriveRack DriveRack Features IntroductionDriveRack DriveRack 4800/4820 FeaturesWarranty DriveRackIntroduction Service Contact InfoIntroductionDriveRack Front panel Getting Started Rear Panel 4800/4820 Front Panel Getting StartedOuput Channel Select Input Channel Select A-DThreshold Meters RTA Input JackGettingStarted System Architect Control Software System Architect FeaturesMute Buttons Minimum System Requirements for System Architect are InstallationRecommended System Requirements DriveRack Attributes Attributes DriveRack Philosophy DriveRack 4800/4820 PhilosophyNavigation Navigation Front Panel OperationModes of Operation Return to Edit mode by pressing the Preset button DriveRack While in Edit mode press and hold the UTILITY/METER button DriveRack DriveRack Module view SystemArchitectDriveRack4800/4820FileStorage Software Operation DriveRack PhilosophySystem Architect DriveRack 4800/4820 Philosophy Module ViewDevice Window Software OperationDevice File Menu Device View FeaturesDevice Edit Menu Device Tools MenuDevice View Menu Preset ToolDevice Help Menu Mutes and Solos MetersVenue File Menu Venue ViewVenue View Menu SoftwareGUI SoftwareOp rationOverviewVenue Insert Menu Venue Tools Menu Venue Panel MenuVenue Help Menu Venue Window MenuDriveRack Front panel Use Press and hold the RTA/LOAD button to load the presetDriveRack Store the name by pressing the STORE/DELETE button DriveRack GUI Operation DriveRack DriveRack Detailed Input Mixer Detailed ParametersDetailed Parameters Input Router Selected Source SwitchFlat/Restore switch EQ On/Off switchFrequency switch Detailed Parameters Input Graphic EQDetailed Parameters Input 9-Band Parametric EQ Delay On/Off switch Detailed Parameters Input DelayDelay fader Units switchDetailed Parameters Output Mixer Master Mute switchChannels A-D Detailed Parameters Output Router Detailed Parameters OutputBandpassFilter/Crossover Detailed Parameters Output 6-Band Parametric EQ Detailed Parameters Output Delay Mode switch AFS On/Off switchClear Live and Clear All buttons Live Filter Lift switch Type switchDetector Highpass fader Sensitivity faderDetailed Parameters Automatic Gain Control AGC Insert AGC On/Off switchThreshold fader Target faderWindow fader Limiter Auto On/Off switchAttack fader Release faderDetailed Parameters AutoWarmth Insert AutoWarmth On/Off switchAmount fader Detailed Parameters Compressor Insert Compressor On/Off switchOverEasy fader Ratio faderHold fader Auto On/Off switchDetailed Parameters De-EsserInsert De-Esser On/Off switchFrequency fader Width faderDetailed Parameters Noise Gate Gate On/Off switchMax Attenuation fader PeakStopPlus On/Off switch Limiter On/Off switchDetailed Parameters Limiter Insert PeakStopPlus Overshoot faderDetailed Parameters Detailed Parameters Notch Filter Insert Notch On/Off switchDetailed Parameters SubHarmonic Synthesizer Insert SubHarmonic Synth On/Off switchSubHarmonic Level fader 24-36Hz Level faderUtilities Miscellaneous UtilitiesGains & Trims Sample RatePreset Range Access RightsUtilities Real Time Clock UsersDriveRack DriveRackAppendix AppendixDriveRack SpecificationsDriveRackAppendix Block Diagram Crossover Table Preset TableDigital I/O and Clocking Word Clock Termination Zone Controller Wiring ZoneControllerWiringandInstallationZone Controller Installation AppendixDriveRack GND ZC-4 Wiring Diagram Factory Reset Information Factory ResetPower-Up Button Functions Hard Factory ResetOverview of TCP/IP Basics Ethernet NetworkingIP address SubnetDhcp Dynamic Host Configuration Protocol Connecting the Computer Directly to the DriveRackAssumptions Proxy Setup of a Simple Isolated Ethernet Network Using DhcpNetwork Considerations and Limitations Virtual Private Networks VPNSoftware Firewall NetworkTroubleshootingEthernet Link Copyrights AppendixDriveRack DriveRackAppendix 18-0353-B