Instruction/ maintenance manual of the product 4820 dbx
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U U s s e e r r M M a a n n u u a a l l 4800/4820 ® Complete Equalization & Loudspeaker Management System.
W ARNING FOR YOUR PROTECTION READ THESE INSTRUCTIONS: KEEP THESE INSTRUCTIONS HEED ALL W ARNINGS FOLLOW ALL INSTRUCTIONS THE APP ARA TUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING LIQ - UID AND NO OBJECT FILLED WITH LIQUID, SUCH AS V ASES, SHALL BE PLACED ON THE APP ARA TUS.
U.K. MAINS PLUG W ARNING A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facili- ty . NEVER UNDER ANY CIRCUMST ANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET .
T ab le of Contents Intr oduction 0.1 DriveRack 4800/4820 F eatures .............................ii 0.2 Service Contact Info .............................................iii 0.3 W arranty ..............................................................iii Section 1 - Getting Star ted 1.
® Appendix A.1 Specifications ......................................................68 A.2 Block Diagram ....................................................70 A.3 P reset T able .........................................................71 A.4 Crosso ver T able .
® DriveRack ®.
FEA TURES CUSTOMER SER VICE INFO W ARRANTY INFO INTRODUCTION DriveRack ® Introduction.
Intr oduction ® DriveRack ® 4800/4820 User Man ual ii Congratulations on your purchase of the dbx ® Driv eRack ® 4800 or 4820 system processor! Designed to provide “E ver ything you need between.
If you requir e technical support, contact dbx Customer Service. Be prepar ed to accurately describe the prob- lem. Know the serial number of your unit - this is printed on a sticker attached to the top panel. If y ou have not already taken the time to fill out your warranty r egistration card and send it in, please do so now .
Intr oduction ® DriveRack ® 4800/4820 User Man ual DriveRack ® iv.
REAR P ANEL FRONT P ANEL SOFTW ARE INST ALLA TION ® Getting Started Section 1 DriveRack ®.
Getting Star ted ® 2 Section 1 1. IEC P ow er Cord Receptacle The 4800 and 4820 come with a power supply that will accept voltages ranging fr om 100V -240V at fre- quencies from 50Hz-60Hz. An IEC cord is included for both a US and E uropean style AC mains plug.
® 9. Zone Control Inputs 1-12 (RJ-45) These RJ-45 connections are used to receiv e control information from up to 12 Z C wall panel con- trollers. 10. W or d Clock BNC Connection This connection allows the Driv eRack 4800 or 4820 to lock to a master system clock.
Getting Star ted ® 4 Section 1 O O U U T T P P U U T T is used to select and/or enter the Input and Output setup module. R R O O U U T T E E / / M M I I X X is used to select and/or enter either the Input or Output R outer or Mixer module.
Section 1 ® 9 9 . . S S t t a a t t u u s s L L E E D D s s This cluster of four LEDs indicate the following functions: C C L L I I P P - indicates either A/D, D/A, or DSP clipping. S S Y Y N N C C - indicates DSP syncing to an internal clock, AES/EBU, CobraN et, or W ordclock input.
Section 1 Getting Star ted ® 6 C C L L I I P P - indicates either A/D, D/A, or DSP clipping. S S Y Y N N C C - indicates DSP syncing to an internal clock, AES/EBU or W ordclock input. R R S S - - 2 2 3 3 2 2 - indicates PC connection via RS-232. L L I I N N K K / / A A C C T T - indicates connection to and/or activity on an Ethernet network.
® Minimum System Requir ements for System Architect ar e: 1GHz, P entium III processor 512MB RAM Windows 2000 or XP service pack 2 Recommended System Requirements: 3GHz, P entium 4 processor 1GB RAM .
Getting Star ted ® 8 Section 1 DriveRack ® DriveRack ® 4800/4820 User Man ual.
PRESETS A TTRIBUTES ® DriveRack Philosophy Section 2 DriveRack ®.
Section 2 The philosophy of the DriveRack 4800 and 4820 r evolves around the concept of two elements: Attributes and P resets. Attributes Attributes are parameters that ar e global like sample rate , analog I/O gain str ucture , or R T A mi c r ophone pr e- amp gain .
NA VIGA TION MODES ® Front Panel Operation Section 3 DriveRack ®.
F r ont P anel Operation ® 12 Section 3 The DriveRack 4800 is modal in its operation with differ ent types of navigation depending on the mode that the unit is in.
® F r ont P anel Operation Scroll N avigation - This navigation is used in the Utility menus, as well as in storing, r ecalling and delet- ing presets. I t is very useful for finding menu offerings that are located within another sub-menu. F or example, the R T A mic pre gain is located within the Gain/T rim sub-menu of the Utility .
F r ont P anel Operation ® 14 Section 3 Edit P reset M ode - In Edit mode, access to any of the processing functions is no more than two button presses away .
® 5. N avigate to the location where you want to paste and press the NEXT/P ASTE button. 6. T o exit Copy/P aste mode and return to Edit mode, pr ess the PRESET button. Recall P r eset Mode - Any pr eset in the preset list can be recalled, as long as it is within the P reset Minimum and Maximum range set in the U tility menu.
F r ont P anel Operation ® 16 Section 3 1. While in Edit mode, pr ess and hold the ST ORE/DELETE button for two seconds. 2. Select the preset y ou would like to delete. 3. P ress the ST ORE/DELETE button to delete the preset, and once more to confirm the deletion.
® 2. U se the PREV and NEXT buttons to navigate through the pages of meters. 3. T o exit Meter menus and r eturn to Edit mode, press the PRESET button. Wizar d Mode - The W izard mode will pro vide you with setup functions. The Wizard mode is not func- tional in v1.
F r ont P anel Operation ® 18 Section 3 5. Once the desired configuration is cr eated, press and hold the R T A/LO AD button to load the configura- tion. 6. T o exit Configuration and return to Edit mode without making any changes to the configuration, press the PRESET button.
MODULE VIEW DEVICE VIEW VENUE VIEW ® Software Operation Section 4 DriveRack ®.
Softwar e Operation ® 20 Section 4 The most basic storage elements of the DriveRack 4800 and 4820 ar e the Attribute and the P reset. Attributes are global parameters for that unit, while P resets are snapshots of the current processing func- tions or modules, their location in the signal path, and their parameters (see Section 2.
® Softwar e Operation Section 4 21 Module View Featur es While changes to the parameters within the module are instantaneous, every Module View includes the OK and Cancel buttons to either accept or reject these changes before closing the windo w .
Softwar e Operation ® 22 Section 4 De vice View Featur es Besides access to the processing functions, the Device View offers many other features, some of which can be found as pull-downs in the Windows M enu. I tems in the Windo ws Menu include the F ile Menu, Edit Menu, T ools Menu, View M enu, and H elp Menu.
® Section 4 23 De vice View Menu In the View Menu, y ou can select to Dock the window in the V enue View or leave it floating. De vice Help Menu In the H elp Menu, you can select fr om Contents, Index, or Search as ways to sear ch for topics in the Help F ile.
Softwar e Operation ® 24 Section 4 Meters The Meters in the lo wer left hand corner of the Device View are real time meters, and they sho w the cur- rent input and output levels if the unit is online. The meters can be turned off to reduce the amount of network traffic if so desired.
® The V enue View is the most encompassing perspective, pro viding a “ global” view of the entire venue or sys- tem. The V enue View pro vides many features that make System Architect superior in the way that it pr o- vides control of an audio system.
® 26 V en ue Edit Menu In the Edit menu, S ystem Architect provides the ability to U ndo or Redo commands as well as C ut, Copy , P aste and Delete selected units in the V enue. The F ind… command lets you find a specific unit in the sys- tem either by name or ID#.
® P P r r o o p p e e r r t t i i e e s s are all of the user-defined display options for any venue view , device, custom control panel, or controls in System Architect. D ifferent items pro vide different editable properties, such as changing the name, background color , or background image.
Softwar e Operation ® 28 V en ue P anel Menu The P anel M enu option lets you create and manage C ustom Control P anels, with functions including add, remo ve, import, export and activate a control panel. V en ue T ools Menu The T ools Menu lets y ou manage and control the way System Architect functions.
® V en ue Windo w Menu The Windo w M enu manages the main V enue V iew window . I t provides you with the follo wing options: N N e e w w adds a new V enue View to the main window . N N e e w w H H o o r r i i z z o o n n t t a a l l G G r r o o u u p p tiles the tab groups horizontally .
Softwar e Operation ® 30 Section 4 DriveRack ® DriveRack ® 4800/4820 User Man ual.
FRONT P ANEL OPERA TION SOFTW ARE OPERA TION ® In Use Section 5 DriveRack ®.
In Use ® 32 Section 5 U nder normal operation the most common modes are Configuration, Edit, S tore and R ecall Pr eset. The simplest way to illustrate these modes in use is by example; this will be done for both the F ront P anel N avigation as well as the GUI.
® 2. P ress the INPUT A button and the EQ 1 button to mov e to the Input G raphic EQ. 3. T urn Encoder knob #3 to link the G raphic EQs on Inputs 1 and 2. 4. P ress the INSER T 2 button and turn the Encoder #1 knob to select the Compressor . 5. T urn Encoder knob #3 to link the Compressors on I nputs 1 and 2.
In Use ® 34 Section 5 7. Rename the Input b y pressing Encoder #2 and using Encoder #1 and Encoder #2 to select characters and advance the cursor . 8. Stor e the name by pressing the ST ORE/DELETE button. 9. T o change the Mid Router to a M ixer , press the Output 6 button and then the MIX/R OUTE button, then turn Encoder #1 to select Mix er .
® With three pages per B andpass filter set, it should be noted that there will be nine total pages in this func- tion; these pages can either be accessed by continuing to press NEXT P AGE or by pressing the next OUTPUT CHANNEL button.
In Use ® 36 Section 5 N ow that the preset has had its configuration changed and has been edited, we can S tore it: 1. P ress the ST ORE/DELETE button to enter S tore mode. 2. Select a location for this new preset in the pr eset table by turning Encoder Knob #1.
® 2. Select the Configuration Wizard. 3. U se the links on the left side of the page to quickly jump to the desired locations. 4. Select the EQs link in the Input S ection, and click the check box to link the Input Channel A and B Graphic EQs.
In Use ® 38 Section 5 DriveRack ® DriveRack ® 4800/4820 User Man ual.
DET AILED P ARAMETERS ® Detailed Parameters Section 6 DriveRack ®.
Detailed P arameters ® Section 6 ® The DriveRack 4800 and 4820 pro vide a wealth of processing capabilities. This processing can be broken into two distinct sections: Input P rocessing and Output P rocessing. Both the Input and Output sections offer two types of processing functions, F ixed and I nsert.
® Detailed P arameters Section 6 41 ® The Input Router lets y ou select from any of the input sources and adjust the Master Gain. P ink N oise On/Off and Gain ar e also available in this module. Selected Sour ce Switch Allows selection between the input S ources (Analog 1-4, AES/EBU 1-4, CobraN et 1-4).
Detailed P arameters ® Section 6 ® The DriveRack 4800/4820 pro vides a 31 band G raphic EQ on each input channel. This EQ offers up to +/-15dB of gain at each of the 31 ISO frequency centers. EQ On/Off switch This turns the Graphic EQ on and off . Flat/Restore s witch This either flattens the EQ or restores it to its pr evious settings.
® The DriveRack 4800 and 4820 offer a second EQ (EQ2), after the input G raphic EQ, that can be config- ured as either a G raphic or 9-Band P arametric EQ. The 9-Band P arametric EQ provides F requency , Gain and Q control for each EQ band. EQ On/Off switch This turns the P arametric EQ on and off.
Detailed P arameters ® Section 6 Each input channel of the DriveRack 4800 and 4820 pro vide up to 680 mSec of I nput Delay . Dela y On/Off switch This turns the input channel Delay module on and off. Dela y fader This sets the amount of delay time and is adjustable in either 10 or 20 µSec steps (one sample at either 96 or 48 kHz).
® Each output DSP channel can be configured with either a Mix er or Router . The Output Mixer lets you mix between signals coming from the input DSP channels. Master G ain and M uting of this Mixer is also available. Channels A-D P rovides gain control for each of the input channels (–inf to +20dB).
Detailed P arameters ® Section 6 The Output Router lets you select fr om any of the input channels, adjust the Master Gain and M ute the output. Selected Sour ce Switch Allows selection between the input channels (Channels A-D). Master Gain fader P rovides Gain contr ol for the Router module (–inf to +20dB).
DriveRack ® 4800/4820 User Man ual ® The DriveRack 4800/4820 pro vides a Bandpass F ilter on each output channel. These filters can be con- figured as Crosso vers so you can adjust the frequency content of the adjacent output channels. Band Select switch This selects the specific band or channel to be adjusted.
Detailed P arameters ® Section 6 The DriveRack 4800 and 4820 offer an Output 6-B and P arametric EQ on each output channel. The 6- Band P arametric EQ provides F requency , Gain and Q control for each of the 6 EQ bands. EQ On/Off switch This turns the P arametric EQ on and off.
DriveRack ® 4800/4820 User Man ual ® The output channels of the DriveRack 4800 and 4820 pro vide up to 1360 mSec of configurable Delay , this means that the Delay can be allocated to where it is needed. Dela y On/Off switch This turns the output channel Delay module on and off.
Detailed P arameters ® Section 6 The DriveRack 4800/4820 offers the ex clusive dbx Advanced F eedback Suppression (AFS) feedback elim- ination module as an Insert processing function on the Input channels.
DriveRack ® 4800/4820 User Man ual ® T ype switch The T ype switch toggles the AFS function between different sensitivities and filter Q settings correspond- ing to the type of application. The different T ypes are S peech (Highest S ensitivity , Bandwidth = 1/5 octave and Q=7.
Detailed P arameters ® Section 6 The Automatic Gain Contr ol Insert is available in the DriveRack 4800 and 4820 in both the I nput and Output Insert modules. A utomatic Gain Control (or AGC) is used to keep the average lev el of a signal con- stant. This is done by selecting a desired T arget output level and the Window around that T arget.
DriveRack ® 4800/4820 User Man ual ® Windo w fader This parameter adjusts the amount of variation in the output and ranges from 1 to 10dB. F or most appli- cations a Windo w of +/- 2 or 3 dB maintains the signal adequately . Attack fader The Attack fader adjusts how fast the A GC will increase gain after the signal drops below the T arget.
Detailed P arameters ® Section 6 The Fletcher-M unson Equal-Loudness cur ves show that the per ception of low frequency signals decr eases quickly with decreasing volume. The DriveRack 4800 and 4820 offer the A utoW armth ® Insert module on each output (Insert 1) to compensate for this perceived loss in lo w frequencies.
DriveRack ® 4800/4820 User Man ual ® The DriveRack 4800 and 4820 offer an I nsert Compression function on both the Input and Output Inserts. This function is modeled from classic dbx Compressors such as the 160 and the 165. Compressor On/Off s witch This switch turns the Compressor module on and off .
Detailed P arameters ® Section 6 Auto On/Off switch Auto mode dynamically sets the Attack, H old, and Release parameters in r eal time, based on the incoming signal. This switch turns the Auto mode on and off. Attack fader The Attack parameter sets how quickly the compr essor starts to compress the signal after it passes the threshold.
DriveRack ® 4800/4820 User Man ual ® The DriveRack 4800/4820 offers a De-Esser module av ailable on the Input Inserts. This De-Esser effect is ideal for remo ving unwanted vocal sibilance and is based on the original dbx 902 De-Esser module.
Detailed P arameters ® Section 6 The DriveRack 4800 and 4820 pro vide a N oise Gate Insert that can be placed in both the Input and/or the Output section.
DriveRack ® 4800/4820 User Man ual ® The DriveRack 4800/4820 units offer a Limiter in the Output I nsert position. A Limiter operates on the same principles as a compressor (see section 6.14) but it is designed and used more for system pr otection rather than musical dynamics control.
Detailed P arameters ® Section 6 Attack fader The Attack parameter sets how quickly the Limiter starts to reduce the gain of the signal after it passes the Threshold. The Attack can range between 0.1 mSec and 200 mSec. The Attack time is dynamically set while in Auto mode.
DriveRack ® 4800/4820 User Man ual ® The 4800 and 4820 units offer 6-Band N otch F ilter that can be inserted in the Input section. The Notch filter is designed to provide a significant amount of cut in v er y narrow fr equency bandwidths to remov e room resonances and other unwanted artifacts.
Detailed P arameters ® Section 6 The SubH armonic Synthesizer module is designed to pro vide additional low frequency content to audio signals and is available as an Insert in both the Input and O utput sections.
UTILITIES ® Section 7 Utilities DriveRack ®.
Utilities ® Section 7 As stated earlier , the Utility menus contain many of the attributes of the D riveRack 4800 and 4820 devices. With the exception of A ccess Rights (which are stored manually), these attributes ar e stored instantly as they are changed.
DriveRack ® 4800/4820 User Man ual ® The DriveRack 4800 and 4820 have an internal R eal Time Clock. This clock allows the devices to load a preset based on a time schedule, for automated system changes. The real time clock is set by syncing the DriveRack device to a computer from which it extracts the clock information.
Utilities ® Section 7 Note: Setting up a basic Network The DriveRack 4800 and 4820 come with an included E thernet cable. The DriveRack 4800/4820 is set up at the factory for DHCP allowing it to be assigned an IP address by a DHCP Server .
DriveRack ® Appendix ®.
® Appendix Analog Inputs: (4) Connectors: F emale XLR T ype: Electronically balanced, RF filter ed Impedance: >50k ohms Maximum Input Lev el: Software selectable for: +28, +26, +24, +22, +20, +18,.
DriveRack ® 4800/4820 User Man ual ® Input Insert P rocessing: T wo selectable Insert Processing blocks per input T ype: N oise Gate, Compressor , Auto G ain Control, De-Esser , Sub-Harmonic S ynth,.
® Appendix A.2 - Block Diagram DriveRack ® DriveRack ® 4800/4820 User Man ual 70.
DriveRack ® 4800/4820 User Man ual ® A.4 - Cr osso ver T able A.3 - Pr eset T able Appendix 71 i r c s e D e m a N r e b m u N t e s e r P p n o i t n e p O e d i W 1 n o s r e t l i f s s a p d n a b t n e d n e p e d n i g n i d i v o r p n e p o y l e t e l p m o c s i t e s e r p s i h T t u o h c a e p .
® Appendix A.6 - W ord Clock T ermination A.5 - Digital I/O and Clocking Clock Sou r ce 4 8 00/4 8 20 4 8 00/4 8 20 4 8 00/4 8 20 75 Ω Coaxial Cable BNC “T” 75 Ω BNC Te r mi n ato r DriveRack .
DriveRack ® 4800/4820 User Man ual ® Zone Contr oller Wiring All Zone Controllers can be wir ed serially or in parallel. T o wire in series, each Zone Controller must have an identification number (ID) chosen using the DIP switches on the side of the controller (see diagram A).
® Appendix Diagram A RJ45 CONNECT ONLY TO ZONE CONTROLLE R INPU T . IEC60065 UL-6500 80-1342-A RJ45 CONNECT ONLY TO ZONE CONTROLLE R INPU T . IEC60065 UL-6500 80-1342-A ID# 1 ID# 4 Diagram B Diagram .
DriveRack ® 4800/4820 User Man ual ® Appendix 75 Diagram A Diagram B Diagram C RJ-45 ( 8 -P ositio n ) RJ-45 ( 8 -P ositio n ) O r a ng e White/Blue G r ee n Blue White/B r ow n B r ow n -VREF -Zo n.
® Appendix DriveRack ® DriveRack ® 4800/4820 User Man ual 76 A.8 - ZC-4 Wiring Diagram.
DriveRack ® 4800/4820 User Man ual ® Factory Reset Information In the event that a r eset is required, the Driv eRack 4800/4820 offers you the option of performing a “Hard ” or “Soft ” F actory Reset. P o wer -Up Button Functions All P ower-U p Functions will use the MUTE 1 thr ough MUTE 8 buttons.
® Appendix This section of the appendix provides a step-b y-step guide on how to properly connect the Driv eRack 4800 or 4820 to a Local Area N etwork (LAN) for several different network ar chitectures. The first topology is a simple direct connection using the pro vided Ethernet cable.
DriveRack ® 4800/4820 User Man ual ® DHCP (Dynamic Host Configuration Pr otocol) This is a protocol for automatically assigning IP addresses to devices on a network. With dynamic (DHCP) addressing, a device might have a differ ent IP address every time it connects to the network.
® Appendix N N O O T T E E : The following steps will overwrite these settings, so you will need to keep this information to restore y our network settings.
DriveRack ® 4800/4820 User Man ual ® units utilizes IP broadcast packets. These packets will not travel through internet routers and even some high end core switches. In a larger mor e complex network, proxy is used to tell the software wher e on the network to look for the 4800/4820 devices.
® Appendix • If the proxy link initially fails to connect, the user must go offline and then go back online before the proxy connection will be re-established. • F irewall Considerations: The 4800/4820 uses por t 3804 (udp and tcp) to communicate with the System Architect software.
DriveRack ® 4800/4820 User Man ual ® P ortions of code are covered b y the following copyrights: X Consortium Copyright (C) 1996 X Consortium P ermission is hereby granted, free of charge, to any pe.
All advertising materials mentioning features or use of this software must display the follo wing acknowledge- ment: This product includes software developed b y the U niversity of California, Lawrence Berkeley Laboratory .
Appendix DriveRack ® DriveRack ® 4800/4820 User Man ual ® 85.
8760 South Sandy P arkwa y • Sandy , Utah 84070 Phone: (801) 568-7660 • F ax (801) 568-7662 Int’l F ax: (801) 568-7583 Questions or comments? E-mail us at: customer@dbxpr o .
An important point after buying a device dbx 4820 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought dbx 4820 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data dbx 4820 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, dbx 4820 you will learn all the available features of the product, as well as information on its operation. The information that you get dbx 4820 will certainly help you make a decision on the purchase.
If you already are a holder of dbx 4820, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime dbx 4820.
However, one of the most important roles played by the user manual is to help in solving problems with dbx 4820. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device dbx 4820 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
