Dbx DRIVERACK PA User Manual

Download

User Manual

Complete Equalization & Loudspeaker Control System

Featuring

Custom T unings

WARNING FORYOUR PROTECTION

PLEASE READ THE FOLLOWING:

KEEP THESE INSTRUCTIONS HEED ALL WARNINGS FOLLOW ALL INSTRUCTIONS DO NOT USE THIS APPARATUS NEAR WATER CLEAN ONLY WITH A DRY CLOTH. DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH THE

MANUFACTURER’S INSTRUCTIONS. DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS, STOVES,

OR OTHER APPARATUS (INCLUDING AMPLIFIERS) THAT PRODUCE HEAT. ONLY USE ATTACHMENTS/ACCESSORIES SPECIFIED BY THE MANUFACTURER. UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERI-

ODS OF TIME. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug

has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or third prong are provided for your safety. If the provided plug does not fit your outlet, consult an electrician for replacement of the obsolete outlet.

Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

Use only with the cart stand, tripod bracket, or table specified by the manufacture, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

Refer all servicing to to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

POWER ON/OFF SWITCH: The Power switch used in this piece of equipment DOES NOT break the connection from the mains.

MAINS DISCONNECT: The plug shall remain readily operable. For rack-mount or installation where plug is not accessible, an all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated into the electrical installation of the rack or building.

FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEPTACLE: Replace fuse with same type and rating only.

MULTIPLE-INPUT VOLTAGE: This equipment may require the use of a different line cord, attachment plug, or both, depending on the available power source at installation. Connect this equipment only to the power source indicated on the equipment rear panel. To reduce the risk of fire or electric shock, refer servicing to qualified service personnel or equivalent.

This Equipment is intended for rack mount use only.

SAFETY INSTRUCTIONS

NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD. WARNING:THISAPPLIANCE MUSTBEEARTHED. The cores in the mains lead are coloured in accordance with the following code:

GREEN and YELLOW - Earth BLUE - Neutral BROWN - Live

As colours of the cores in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows:

• The core which is coloured green and yellow must be connected to the terminal in the plug marked with the letter E, or with the earth symbol, or coloured green, or green and yellow.

• The core which is coloured blue must be connected to the terminal marked N or coloured black.

• The core which is coloured brown must be connected to the terminal marked L or coloured red.

This equipment may require the use of a different line cord, attachment plug, or both, depending on the available power source at installation. If the attachment plug needs to be changed, refer servicing to qualified service personnel who should refer to the table below. The green/yellow wire shall be connected directly to the units chassis.

WARNING: If the ground is defeated, certain fault conditions in the unit or in the system to which it is connected can result in full line voltage between chassis and earth ground. Severe injury or death can then result if the chassis and earth ground are touched simultaneously.

The symbols shown above are internationally accepted symbols that warn of potential hazards with electrical products. The lightning flash with arrowpoint in an equilateral triangle means that there are dangerous voltages present within the unit. The exclamation point in an equilateral triangle indicates that it is necessary for the user to refer to the owner’s manual.

These symbols warn that there are no user serviceable parts inside the unit. Do not open the unit. Do not attempt to service the unit yourself. Refer all servicing to qualified personnel. Opening the chassis for any reason will void the manufacturer’s warranty. Do not get the unit wet. If liquid is spilled on the unit, shut it off immediately and take it to a dealer for service. Disconnect the unit during storms to prevent damage.

IMPORTANT SAFETY INSTRUCTIONS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC

SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE

CONDUCTOR

L N E

LIVE

NEUTRAL

EARTH GND

WIRE COLOR

Normal Alt

BROWN

BLUE

GREEN/YEL

BLACK WHITE

GREEN

U.K. MAINS PLUG WARNING

A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility. NEVER UNDER

ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET. Do not use the

mains plug without the fuse cover in place. Replacement fuse covers can be obtained from your local retailer. Replacement fuses are 13 amps and MUST be ASTA approved

to BS1362.

LITHIUM BATTERY

WARNING

CAUTION!

This product may contain a lithium battery.There is danger of explosion if the battery is incorrectly replaced.Replace only with an Eveready CR 2032 or equivalent.Make sure the battery is installed with the correct polarity.Discard used batteries according to manufacturer’s instructions.

ADVARSEL!

Lithiumbatteri - Eksplosjonsfare.Ved utskifting benyttes kun batteri som anbefalt av apparatfabrikanten. Brukt batteri returneres apparatleverandøren.

ADVARSEL!

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri av samme fabrikat og type. Levér det brugte batteri tilbage til leverandøren.

VAROITUS!

Paristo voi räjähtää,jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

VARNING!

Explosionsfara vid felaktigt batteribyte.Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren.Kassera använt batteri enligt fabrikantens instruktion.

IMPORTANT SAFETY INSTRUCTIONS

ELECTROMAGNETIC

COMPATIBILITY

This unit conforms to the Product Specifications noted on the Declaration of Conformity. Operation is subject to the following two conditions:

• this device may not cause harmful interference, and

• this device must accept any interference received, including interference that may cause undesired operation.

Operation of this unit within significant electromagnetic fields should be avoided.

• use only shielded interconnecting cables.

DECLARATION OF

CONFORMITY

Manufacturer’s Name: dbx Professional Products

Manufacturer’s Address: 8760 S. Sandy Parkway

Sandy, Utah 84070, USA

declares that the product:

Product name: dbx DriveRack PA Note: Product name may be suffixed by the EU.

Product option: None

conforms to the following Product Specifications:

Safety: IEC 60065 (1998)

EMC: EN 55013 (1990)

EN 55020 (1991)

Supplementary Information:

The product herewith complies with the requirements of the Low Voltage Directive 72/23/EEC and the EMC Directive 89/336/EEC as amended by Directive 93/68/EEC.

Vice-President of Engineering 8760 S. Sandy Parkway Sandy, Utah 84070, USA Date: April 19,2002

European Contact: Your local dbx Sales and Service Office or

Harman Music Group 8760 South Sandy Parkway Sandy, Utah 84070 USA Ph: (801) 566-8800 Fax: (801) 568-7583

Table of Contents

DriveRack

™

Introduction

0.1 Defining the DriveRack™ PA .........................ii

0.2 Service Contact Info ........................................iii

0.3 Warranty ...........................................................iv

Section 1 - Getting Started

1.1 Rear Panel ......................................................2

1.2 Front Panel .....................................................2

1.3 Quick Start .....................................................3

Section 2 - Editing Functions

2.1 Basic Navigation Modes.................................12

2.2 Button Array Overview..................................12

2.3 Navigating the EQ Section (GEQ/PEQ) ........14

2.4 Navigating the Subharmonic Synthesizer Section....14

2.5 Navigating the Crossover Section..................14

2.6 Navigating the Feedback Suppression Section ..15

2.7 Navigating the Comp/Limiter Section...........15

2.8 Navigating the Speaker Alignment Delay

Section..................................................................15

2.9 Navigating the Utility Section........................16

2.10 Navigating the Wizard Section ....................16

Section 3 - Operating the DriveRack PA

3.1 Program Definition .........................................18

3.2 Navigating Factory Programs .........................18

3.3 Editing Factory Programs ...............................18

Section 4 - Detailed Parameters

4.1 Pre-Crossover Graphic EQ.............................22

4.2 Advanced Feedback Suppressor ...................22

4.3 Subharmonic Synthesizer...............................23

4.4 Crossover ........................................................24

4.5 Post-Crossover Parametric EQ.......................25

4.6 Compressor/Limiter........................................25

4.7 Speaker Alignment Delay .............................27

Section 5 - Application Guide

5.1 2X6 Crossover.................................................30

5.2 2X5 Crossover.................................................31

5.3 2X4 Crossover.................................................32

5.4 2X3 Crossover.................................................33

Appendix

A.1 Factory Reset .................................................36

A.2 Quick Key Options ........................................36

A.3 Specifications..................................................37

A.4 Auto EQ Optimization Tips ..........................37

A.5 Crossover Diagrams.......................................38

A.6 Block Diagram ...............................................39

A.7 Prog List/Speaker Tunings/Amp Tunings ....40

A.8 System Setup and Gain Structure .................41

DriveRack™ User Manual

Table of Contents

INTRO

CUSTOMER SERVICE INFO

Defining the DriveRack

WARRANTY INFO

INTRODUCTION

DriveRack

™

Introduction

DriveRack™ PA User Manual

DriveRack

™

Drive your PA to a whole new level of performance with the DriveRack

PA Complete Equalization & Loudspeaker Control System. The DriveRack PA from dbx Professional Products represents a complete integration of the key elements that help ensure optimal loudspeaker system management in P A-specific applications. Capitalizing on the legendary 480 DriveRack technology, the DriveRack PA is able to provide its user with top-tier, pro-level loudspeaker management specifications, yet still remain appealing to the budget-conscious audiophile who requires a tried and true utilitarian workhorse. With its all-inclusive, no-compromise design, the DriveRack PA has been systematically developed and designed to grow with your system needs for years to come.

The dbx DriveRack™ PA is the most effective way to manage all aspects of Loudspeaker management for Public Address system applications. The DriveRack P A essentially becomes the only device that you will need between the mixer and the power amps. The following are just some of the features of the DriveRack™ PA.

DriveRack™ PA features:

• Stereo Feedback Elimination with 12 feedback notch filters

• Dual 28-band Graphic EQ

• Classic dbx®Compressor

• 120A Sub-harmonic Synthesizer

• 2x3, 2x4, 2x5, 2x6 Crossover Configurations

• Stereo Multi-band Parametric EQ

• Stereo Output Limiters

• Alignment Delay

• Pink Noise Generator

• Auto-EQ with 28-Band RTA

• JBL®Speaker and Crown®Power Amp Tunings with Setup Wizard

• 25 User Programs / 25 Factory Programs

• 2 Channel XLR Input and 6 Channel XLR Output

• Front panel RTA-M XLR input with phantom power

• 24-Bit ADC/24-Bit DAC, >110 dB Dynamic Range

• TypeIV®Conversion System

• Full Graphic LCD Display

0.1 Defining the DriveRack™ PA

INTRODUCTION

Introduction

DriveRack

™

DriveRack™ PA User Manual

By including every form of processing necessary to drive the signal from the mixer to the power amp, the DriveRack™ PA allows you to eliminate all other processing devices normally found in large and cumbersome traditional drive rack systems of the past.

The DriveRack™ PA Loud Speaker Management System includes two balanced XLR inputs, as well as six balanced XLR output connectors.

If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit - this is printed on a sticker attached to the top panel. If you have not already taken the time to fill out your warranty registration card and send it in, please do so now.

Before you return a product to the factory for service, we recommend you refer to the manual. Make sure you have correctly followed installation steps and operation procedures. If you are still unable to solve a problem, contact our Customer Service Department at (801) 568-7660 for consultation. If you need to return a product to the factory for service, you MUST contact Customer Service to obtain a Return Authorization Number.

No returned products will be accepted at the factory without a Return Authorization Number.

Please refer to the Warranty information on the following page, which extends to the first enduser. After expiration of the warranty, a reasonable charge will be made for parts, labor, and packing if you choose to use the factory service facility. In all cases, you are responsible for transportation charges to the factory. dbx will pay return shipping if the unit is still under warranty.

Use the original packing material if it is available. Mark the package with the name of the shipper and with these words in red: DELICATE INSTRUMENT, FRAGILE! Insure the package properly. Ship prepaid, not collect. Do not ship parcel post.

0.2 Service Contact Info

iii

Introduction

DriveRack™ PA User Manual

DriveRack

™

This warranty is valid only for the original purchaser and only in the United States.

1. The warranty registration card that accompanies this product must be mailed within 30 days

after purchase date to validate this warranty. Proof-of-purchase is considered to be the burden of the consumer.

2. dbx warrants this product, when bought and used solely within the U.S., to be free from

defects in materials and workmanship under normal use and service.

3. dbx liability under this warranty is limited to repairing or, at our discretion, replacing defec-

tive materials that show evidence of defect, provided the product is returned to dbx WITH RETURN AUTHORIZATION from the factory, where all parts and labor will be covered up to a period of two years. A Return Authorization number must be obtained from dbx by telephone. The company shall not be liable for any consequential damage as a result of the product's use in any circuit or assembly.

4. dbx reserves the right to make changes in design or make additions to or improvements upon

this product without incurring any obligation to install the same additions or improvements on products previously manufactured.

5. The foregoing is in lieu of all other warranties, expressed or implied, and dbx neither assumes

nor authorizes any person to assume on its behalf any obligation or liability in connection with the sale of this product. In no event shall dbx or its dealers be liable for special or consequential damages or from any delay in the performance of this warranty due to causes beyond their control.

0.3 W arranty

Getting Started

Section 1

DriveRack

™

Getting Started

DriveRack™ PA User Manual

Section 1

DriveRack

™

IEC Power Cord Receptacle

The DriveRack™ PA comes with a power supply that will accept voltages ranging from 100V120V at frequencies from 50Hz-60Hz. An IEC cord is included. EU version accepts 220V-240V at frequencies from 50Hz-60Hz.

Outputs 1-6

The output section of the DriveRack™ PA offers six electronically balanced XLR connectors.

Inputs 1-2

The input section of the DriveRack™ PA offers two electronically balanced XLR connectors.

+4/-10dBv Switch

This switch changes the level from either +4 or -10dBv.

Ground Lift Switch

The ground lift switch lifts the pin 1 chassis ground of both input XLR connectors.

RT A Input Jack

This balanced XLR input is used for the connection of an RTA microphone, which allows the user to “Pink” and optimize the EQ settings of any room through the use of the Auto EQ in the Wizard setup assistant.

RT A MIC Input Selector

Pressing the RTA MIC input button will engage the front panel RTA input XLR connector.

Data Wheel

The Data wheel of the DriveRack™ PA is used to scroll through the program menu, load programs, select parameters and edit parameter values.

CROSSOVER/ALIGNMENT DELAY/GRAPHIC EQ/PARAMETRIC EQ/AUTO/EQ

1.2 Front Panel

1.1 Rear Panel Connections

Left/MonoLeft/Mono

LCD Display

The backlit LCD display of the DriveRack™ PA provides the user with all of the vital processing information of the DriveRack™ P A including: signal routing, effect block editing and Wizard Setup functions. The display will also notify the user if any internal clipping is taking place within the unit. The following message will appear: CLIP.

Function Buttons

The function buttons of the DriveRack™ PA allow direct access to all editing and navigating functions of the DriveRack™ PA. The functions of the aforementioned buttons are as follows:

<PREV PG> - is used to navigate back through the various pages of any module block. <NEXT PG> - is used to navigate forward through the various pages of any module block. <EQ> - is used to move to the EQ modules. Successive presses will move you through the

EQ modules in the input section and through EQ modules located in the output section.

<SUBHARMONIC> - This button is used to move to the Subharmonic Synthesizer module. <XOVER> - is used to move to the Crossover module. <FEEDBACK> - is used to move to the feedback elimination module. <COMP/LIMITER> - is used to move to the Compressor or Limiter modules. <DELAY> - is used to move to the Delay module. <PROGRAM> - is used to enter program mode when pressed. <UTILITY> - is used to access the the Utility menu. <STORE> - is used to store any program changes. <WIZARD> - is used to enter the Wizard section which includes: SYSTEM SETUP, AUTO EQ

WIZARD and AFS WIZARD.

Input Meters

The DriveRack™ PA provides the user with two independent six segment Lightpipe™ input meters that range from -30 to +20 dBu. These meters monitor the signal level right after the input module.

Threshold Meters

The threshold meters indicate that the threshold level has been exceeded within the Limiter section, and gain reduction may be taking place within the specific output channel.

Output Meters

The DriveRack™ PA provides the user with six independent six-segment Lightpipe™ output meters that range from -30 to +20 dBu.

Power Switch

The Power Switch turns the DriveRack™ PA on and off. Note: dbx Professional Products strongly recommends that power amplifiers connected to the DriveRack™ PA, should be powered down prior to cycling the power on the DriveRack™ PA.

For those of you that wish to jump right in, the following information has been provided to act as a quick start guide for optimizing performance of the DriveRack™ PA.

1.3 Quick Start

Getting Started

Section 1

DriveRack

™

DriveRack™ PA User Manual

Getting Started

DriveRack™ PA User Manual

Section 1

DriveRack

™

Signal Path Block Diagram

The following diagram shows the logical and intuitive signal path of the input, effect modules, and output of the DriveRack™ PA.

Connections

• When setting up the DriveRack™ PA, make connections as follows:

• Always make connections prior to applying power to the unit.

• Connect the output from the sending device (mixer) to either of the two XLR inputs connectors shown below.

• Make output connections from any one of the six output XLR connectors shown below to the input of the selected power amps.

• If you will be “pinking” the room through the use of the RTA, connect the selected RTA microphone to the front-panel XLR input, and press the RTA input button.

• IMPORTANT- It is imperative that the power amps are turned off prior to cycling power to the Driverack™

PA. Always make sure that your power amps are the last item turned on and the first turned off.

Once all of the connections have been made and the unit is powered up, you can navigate through the entire signal path of the DriveRack PA from the front panel of the unit. The display provides you with a clear and concise overview of each aspect of the signal path from the input to the output section.

The features of the front panel of the DriveRack™ PA are as follows from left to right. RTA MIC Input- This XLR input is used for the connection of a RTA microphone.

Meters

Outputs

Alignment Delay Alignment Delay Alignment Delay

Left High

Left Input

Stereo/Mono

Pink Noise

Meters

SubHarmonic Synth

GEQ

AFS Notch Filters

Stereo Compressor

3-Band PEQ 2-Band PEQ 2-Band PEQ

Peak Stop Limiter Peak Stop Limiter Peak Stop Limiter

Right Input

Mic Input

Micr Pre amp

GEQ

RTA

Crossover Section - (2X3, 4,5,6)

Right High

Left Mid

Right Mid

Left Low

Right Low

Left/MonoLeft/Mono

CROSSOVER/ALIGNMENT DELAY/GRAPHIC EQ/PARAMETRIC EQ/AUTO/EQ

The RTA MIC input button is used to engage the RTA input connector. LCD Display- All operational information of the DriveRack™ PA is displayed here. The display will also notify the user if any internal clipping is taking place within the unit. The following message will appear: CLIP. Data Wheel - The data wheel is used to scroll through the program menu of the DriveRack™ PA. The Data Wheel is also used to perform editing functions to effects and utility menu features. Button Array - Operational editing is done using this 12 button array. A complete description of each button’s functionality is listed below. Input meters- These two 6-segment LED meters monitor the input level of the DriveRack™ PA directly after the input mixer. Output meters - These six 6-segment meters monitor the output levels of the DriveRack™ PA directly after the output gain stage. Threshold meters - These six 1-segment meters (when lit) show that threshold level of the limiters has been exceeded.

DriveRack PA Wizard

Now that you have made all of your audio connections and have made yourself familiar with the front-panel navigation of the unit, you can easily optimize your system through the use of the DriveRack™ PA Wizard setup system. This feature of the DriveRack™ PA allows for quick and hyper-accurate venue setups. The menu section of the Wizard offers System setup, Auto EQ and AFS (Advanced Feedback Suppression). The following will walk you through your venue setup.

• From program mode, press the <WIZARD> button and the display will appear as

follows:

System Setup

• The arrow will indicate the selected Wizard setup. To select any one of the three

options, rotate the <DATA> wheel. If you are performing the System setup, press either the <NEXT PG> button or the <DATA> wheel and the display will appear as follows:

• Simply rotate the <DATA> wheel to select either a Mono or Stereo input configura- tion. Once you have selected your input option, press the <NEXT PG> button and the display will appear as follows:

Getting Started

Section 1

DriveRack

™

DriveRack™ PA User Manual

DriveRack PA WIZARD System Setup

Auto EQ WIZARD AFS WIZARD

Input Setup

Select Input as MONO or STEREO. >STEREO

Getting Started

Section 1

DriveRack

™

• Simply rotate the <DATA> wheel to select either a Dual Mono or Stereo linked 28-band Graphic EQ. Once you have selected your EQ option, press the <NEXT PG> button and the display will appear as follows:

• Rotate the <Data> wheel to select any one of the numerous custom-tuned MAIN speaker options available. If the speaker being used is not specified in the menu, select CUSTOM. Once you have selected your Main speaker option, press the <NEXT PG> button and the display will appear as follows:

• Rotate the <Data> wheel to select any one of the numerous custom-tuned SUB speaker options available. Once you have selected your SUB speaker option, press the <NEXT PG> button and the display will appear as follows:

• You are now prompted to select a power amp by rotating the <DATA> wheel to select any one of the numerous custom-tuned Amplifier options available. Note that the top line of the display will either read High, Mid or Low depending on your selected speaker setup selections. Once you have selected your Amp tuning option (depending on the amp type), you will select the specified amplifier sensitivity setting if applicable.

• Rotate the <DATA> wheel to select the amplifier manufacturer’s specified amplifier sensitivity setting. Once set, press the <NEXT PG> button, and you will now be given the option of optimizing your amp levels with the DriveRack PA. The page will appear something like this:

DriveRack™ PA User Manual

Graphic EQ Setup

Select GEQ as Dual Mono or Stereo >Dual Mono

Main Speaker

Select Main PA JBL SRX >SR4702X Passive

Sub Speaker

Select Sub PA

>None

High Amplifier

Select an amplifier

>Crwn MacroTech 1202

High Amplifier

Select Sensitivity Crwn MacroTech 1202 >0.775 Volts

High Amp Level

Adjust level same as your amp >25

• You will now rotate the <DATA> wheel to match the same setting as your amplifier

of choice. Note that based on your amp selection, the DriveRack™ PA will initially display the recommended setting of that particular amp for obtaining maximum headroom. This is done to match unity gain from the DriveRack™ PA and your amplifier. Note that if Sub Speakers are included in the speaker selection, you will be asked if the sub woofer is bridged or mono. For more information regarding Amplifier gain settings, please refer to the System Setup and Gain Structure information located in the appendix section.

• Once you have completed your amp level settings, you will press the <NEXT PG>

button, where you will be asked to select a bridged or normal setting fro your low amp (if used). The display will appear as follows:

• Once have made a bridged or mono selection, press the <NEXT PG> where the unit will prompt <DATA> wheel to load your new settings. If you do not wish to load the settings either press the <PROGRAM> button or use the <PREV PG> but- ton to re-edit your settings, By using your selections, the DriveRack™ will automatically generate a new program and speaker selection which are used to choose the correct crossover type, parameters, speaker compensation EQ and delay are also adjusted by the speaker selection. Amplifier parameters are used to set the limiters to stop amplifier clipping and balance out the crossover levels. You may find that you want to re-adjust the crossover levels based on your taste and type of music.

Auto EQ WIZARD

• Once you have custom-tailored your system setup, you can now proceed to EQ your system.The Auto EQ Wizard automatically adjusts the response of the system by producing pink noise and adjusting the Graphic EQ until the RTA matches a selected response. From the DriveRack™ PA Wizard menu, rotate the <DATA> wheel until the display appears as follows:

• Either press the <NEXT PG> button or rotate the <DATA> wheel and the display will read:

• The display is prompting you to connect an RTA-specific microphone to the front-

Getting Started

Section 1

DriveRack

™

DriveRack™ PA User Manual

Low Amp Bridging

Select same as your amp >Normal

DriveRack PA WIZARD

System Setup Auto EQ WIZARD AFS WIZARD

Auto EQ

Connect mic to RTA input. Press RTA input button.

Getting Started

Section 1

DriveRack

™

panel RTA XLR input, and press the <RTA Input> button. It is recommended that you use the optional dbx RTA-M microphone. If you wish to bypass the previous steps all together, from program mode, press the <RTA Input> button, or press the <NEXT PG> button and the display will appear something like this:

• You can now select any one of the several different Frequency responses for the Auto EQ. The options are: Flat (0), and Response A-D, and Low, Medium and High Precision. Once you have selected your desired EQ Frequency response, press the <NEXT PG> button and the display will appear as follows:

• You will now proceed to “Pink” the room by adjusting the Pink level. The range of bar graph is -30dBu to +20dBu. Be certain to raise the pink noise level to the level to be used during the performance. Once the Pink level has been adjusted to the desired volume, press the <NEXT PG> button and the Auto EQ sequence will begin. The display will either show the graphic EQ or the RTA. Rotating the <DATA> wheel clockwise and counter clockwise will toggle between the two modes. You can also select either mode to default to in the Utility menu. Regardless, the display will appear something like this:

• At this point, the DriveRack™ PA will automatically EQ the room. If you are using independent left and right graphic EQs, you will auto EQ each side independently. If you are using a stereo-linked EQ, both sides will be EQ’d simultaneously. Auto EQ can be aborted at any point in the process by pressing the <NEXT PG> button. Upon completion of the Auto EQ Wizard, you can return to program mode by releasing the <RTA Input> button and pressing the <PROGRAM> button.

For more information regarding the Auto EQ section, please refer to the Auto EQ Optimization Tips information located in the Appendix section.

AFS WIZARD

• The DriveRack™ PA also offers its exclusive AFS (Advanced Feedback Suppression) module. This unique feature now makes unwanted feedback in a PA system a thing of the past. The AFS Wizard will lead you through the setup of of the fixed filters of the AFS module. From DriveRack™ PA Wizard menu, rotate the <DATA> wheel until the display appears as follows:

DriveRack™ PA User Manual

t o

RESPONSE C PRECISION LOW

Auto EQ : Pink Noise

Mic Level Turn Up Level Pink Level > 18dB

L R

Auto EQ

• Press the <NEXT PG> button and the display will read:

• Once the gain level of the mixer has been turned down, press the <NEXT PG> but-

ton and the display will read:

• You will now use the <DATA> wheel to select the number of fixed filters. This will

range from values 0-12. The total number of filters will stay at 12, and the number of live filters will be = Total Num Filters – Num Fixed. Live and Fixed filter types differ in that FIXED mode filters are automatically assigned to a frequency creating feedback, thus remaining at that frequency until cleared by the user. In LIVE mode, live filters automatically detect and remove feedback frequencies in the presence of audio (music or speech). 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.

The Fixed/Live filter usage will be indicated at the bottom of each page of the feedback elimination effect. ‘F’ indicates an available fixed filter, and ‘L’ indicates an available live filter. A blocked out F or L indicates a filter that is set, or in use. Once the desired number has been selected, press the <NEXT PG> and the display will read:

• These types pertain to the Q, sensitivity, and algorithm type. The filter is established by using the formula: Q= Freq divided by Bandwidth. This means that a higher Q will produce a filter that is more narrow. Values are: Speech (Bandwidth = 1/5 octave and Q=7.25) Music Low (Narrow notch filter, Bandwidth = 1/10 octave and Q=14.5), Music Medium (Very Narrow notch filter, Bandwidth = 1/20 octave and Q=29) Music High (Ultra Narrow notch filter, Bandwidth = 1/80 octave and Q=116). To guarantee that feedback is suppressed at lower frequencies, the AFS may place wider notch filters at these lower frequencies (below 700 Hz). Once the desired fixed

Getting Started

Section 1

DriveRack

™

DriveRack™ PA User Manual

DriveRack PA WIZARD

System Setup Auto EQ WIZARD AFS WIZARD

AFS

Please turn down the mixer gain. Press

NEXT PG when done.

AFS

Select Number of fixed filters. > 6

F F F F F F L L L L L L

AFS

Select fixed type > Speech

Getting Started

Section 1

DriveRack™ PA

type has been selected, press the <NEXT PG> button and the display will read:

• You are now prompted to raise the output gain of the mixer to the level of the performance. Note that you are raising the mixer gain without an input signal running through the mixer. Once the desired level has been set and all of the fixed filters have been assigned, the unit will automatically move you to the page that indicates the fixed filter setup has been completed. If you have reached the performance level setting and all of the fixed filters have not been used, you may want to return to the page that selects the number of fixed filters and

re-adjust the number of fixed in order to provide you with additional live filters. Regardless, once you have completed the setup, the display will read:

• To return to program mode, simply press the <PROGRAM> or <NEXT PG> button. For more information regarding feedback elimination, please see the AFS parameters of the Detailed parameters section.

DriveRack™ PA User Manual

Slowly Increase the mixer gain to desired level.

F F F F F F L L L L L L

AFS

Fixed Filter Setup Done

F F F F F F L L L L L L

EDITING

FUNCTIONS

Editing Functions

Section 2

DriveRack

™

Editing Functions

Section 2

DriveRack

™

The DriveRack™ PA has been carefully designed and engineered to ensure that all aspects of operation are intuitive and logical. Simply stated, the DriveRack™ PA operating system was designed with user’s best interest in mind.

Navigational aspects of the DriveRack™ P A are clear, concise and more important: flexible. The DriveRack™ PA provides you with essentially three different modes of navigation when performing program edits. 1. FX buttons - This array of 12 FX buttons is your primary mode of directly accessing any effect module. 2. NEXTPG & PREVPG page buttons - Successive presses of the NEXTPG or PREVPG page buttons will move the user from one page to the next in an effect block. 3. Data Wheel - The Data Wheel is used to move through the program menu of the DriveRack™ PA. The Data wheel is also used to change the values of the selected parameter by simply rotating the wheel. Pressing the Data wheel will toggle between the available parameters on any selected page of the currently selected effect module.

PREVIOUS PAGE - Moves to the previous page in the currently selected effect menu.

NEXT PAGE - Moves to the next page in the currently selected effect menu.

EQ - Selects the EQ effect menu. This is the EQ section located prior to the

crossover section. Successive presses will rotate through the various precrossover 28 band EQ and Post-xover PEQ section modules.

SUBHARMONIC - Selects the Subharmonic Synthesizer section.

XOVER - Selects the Crossover section.

FEEDBACK - Selects the Advanced Feedback Suppression (AFS) effect section.

COMP/LIMITER - Selects the Compressor and the Limiter effect section.

Successive presses will move from the Compressor (pre-xover) to the Limiter (postxover).

DELAY - Selects the Alignment Delay effect module.

PROGRAM - This button is used to enter the Program screen from any sub

section within the unit when pressed.

UTILITY - Selects the Utility menu of the DriveRack PA.

STORE - The store button is used to store program edits.

WIZARD - Enters the DriveRack PA Wizard setup menu which includes:

System Setup, Auto EQ setup and AFS Wizard.

2.2 FX Button Array Overview

2.1 Basic Navigation Modes

Editing Functions

DriveRack™ PA User Manual

2.4 Navigating the Subharmonic Section

The EQ button toggles through the EQs used in each channel of the selected program menu.

PEQ

GEQ

To edit the parameters of the EQs used in a selected program, simply use the following procedure. From program mode,

press the EQ button to reach the EQ module to be edited. Successive presses of the EQ button will move through each channel.

Navigate through the Pages of the selected EQ section by depressing "Next Page" or "Prev Page" successively until arriving at the desired Page.

GEQ On/Off Flatten/Restore

Frequency Gain -12dB to12dB

PEQ On/Off Flatten/Restore Bell,HSelf, LShelf, LHShelf,

Band 1 Freq Gain -12dB to12dB Q .20 to 16.0

Band 2 Freq Gain -12dB to12dB Q .20 to 16.0

Band 3 Freq Gain -12dB to12dB Q .20 to 16.0

Successive presses of the Data wheel will select effect parameters within the currently selected page.

GEQ/PEQ

2.3 Navigating the EQ Section (28-GEQ and PEQ)

Editing Functions

Section 2

DriveRack

™

DriveRack™ PA User Manual

From program mode, press the SUBHARMONIC button. Pressing the Data Wheel will select the effect parameter to be edited.

The NEXT and PREV buttons scroll through the pages of selected module.

Subharmonic

Subharmonic - -On/Off Subharmonics % 0-100

24-36Hz Level - 24-36Hz 36-56Hz Level - 36-56Hz

Successive presses of the Data wheel will select effect parameters within the currently selected page.

SUBHARMONIC

Editing Functions

Section 2

DriveRack

™

The NEXT and PREV buttons scroll through the pages of selected module.

AFS On/Off AFS Clear

Mode - Fixed/Live Type- Speech, Low,Med and High Number of Fixed filters 0-12

Live filter Lift - On/Off Lift After - 0-60

FEEDBACK

From program mode, press the FEEDBACK button. Pressing the Data Wheel will select the effect parameter to be edited.

Successive presses of the Data wheel will select effect parameters within the currently selected page.

2.6 Navigating the Feedback Suppression Section

Freq- 20.kHz to Out Type -BW6-24,LR12,24 Gain- Inf to 20dB

Low

High Pass Low Pass High Pass Low Pass High Pass

XOVER

To edit the parameters of the Crossover used in a selected program, simply use the following procedure. From program mode,

press the X-OVER button. Once you have reached the Crossover module, Navigate through the Pages of the selected Crossover

module by pressing the "Next Page" or "Prev Page" buttons successively until arriving at the desired Page.

Freq- 20.kHz to Out Type- BW6-24,LR12,24

Low

Freq- 20.kHz to Out Type- BW6-24,LR12,24 Gain- Inf to 20dB

Mid

Freq- 20.kHz to Out Type- BW6-24,LR12,24

Mid

Freq- 20.kHz to Out Type- BW6-24,LR12,24 Gain- Inf to 20dB

High

Successive presses of the Data wheel will select effect parameters within the currently selected page.

XOVER

2.5 Navigating the XOVER Section

DriveRack™ PA User Manual

2.8 Navigating the Delay Section

The Comp/Limiter button toggles through the Compressor or Limiter modules used in each channel of the selected program.

COMP

Comp On/Off Over Easy Off, 1-10

COMP/LIMITER

Threshold -40-20dB Ratio

1:1 to ∞Inf:1

Gain

-20 to 20dB

LIMITER

Limiter On/Off Over Easy Off, 1-10 Threshold -40-20dB

COMPRESSOR/LIMITER

From program mode, press the comp/limiter button to move to eithter the Compressor or Limiter module. Once you have reached the Crossover module,

successive presses of COMP/LIMITER button will move through each channel that utilizes either a Compressor (pre Crossover) or Limiter (post-crossover) module.

Navigate through the Pages of the selected compressor or Limiter module by pressing the "Next Page" or "Prev Page" buttons successively until you arrive at the desired Page.

Successive presses of the Data wheel will select effect parameters within the currently selected page.

2.7 Navigating the Comp/Limiter Section

Editing Functions

Section 2

DriveRack

™

DriveRack™ PA User Manual

From program mode, press the Delay button. Pressing the Data Wheel will select the effect parameter to be edited.

The NEXT and PREV buttons scroll through the pages of selected module.

DELAY

Delay - On/Off Length - Delay Time - Course, Fine Units - Seconds,Feet,Meters

Successive presses of the Data wheel will select effect parameters within the currently selected page.

DELAY

Editing Functions

Section 2

DriveRack

™

The NEXT and PREV buttons scroll through the pages of selected module.

Input Setup - Stereo or Mono

WIZARD

SYSTEM SETUP

AUTO EQ WIZARD

AFS WIZARD

GEQ Setup-Dual Mono or Stereo Linked

Main Speaker Select See list

Sub Speaker Select See list

Amp SelectHigh, Mid, Low See list

Amp Sensitivity High, Mid, Low

Amp Level High, Mid, Low

Low Amp Bridged/ Normal-

Load New Program-

Connect Mic Pink Noise Level

-Inf to 20dB

Auto EQ - L Auto EQ - R Auto EQ - L-R

Left and Right when using

Linked Graphic EQ

Select Number of Fixed Filters

- 0-12

Mixer gain turn down prompt

Select Type Low, Med, High mode

Mixer Gain Adjust-

WIZARD

From program mode, press the WIZARD button. Pressing the Data Wheel will select the effect parameter to be edited.

Fixed Filter Setup Done-

Successive presses of the Data wheel will select effect parameters within the currently selected page.

2.10 Navigating the Wizard Section

Successive presses of the Data wheel will select effect parameters within the currently selected page.

LCD Contrast 1-16 AEQ Plot - RTA/GEQ Sales Banner - On/Off

UTILITY

Compressor/Limiter Threshold Meters

UTILITY

From program mode, press the UTILITY button. Pressing the Data Wheel will select the effect parameter to be edited.

2.9 Navigating the Utility Section

DriveRack™ PA User Manual

OPERATING

FUNCTIONS

SOFTWARE

Section 3

DriveRack

™

Operating Functions

Section 3

DriveRack

™

DriveRack™ PA User Manual

The Operation section of the DriveRack™ PA will be your key to successful navigation of the operation of the DriveRack™ PA. The following information provides descriptions about program functions and operating functions of the DriveRack™ PA.

The first step in understanding the thorough programming capabilities of the DriveRack™ is to understand the elements involved, that when combined, define a complete “program.” Within an individual program, there are several levels of editing that make up the complete program. After turning the unit on, you will be at the “program” mode level. This level supplies the user with current program information such as: current signal path, effect usage, and program name. From this point, the DriveRack™ P A gives you the option of entering subsequent levels of operation that are dedicated to program editing. The Utility menu mode is accessed via the utility menu, and is not part of a single program.

From the factory, the DriveRack™ PA is shipped with 25 factory programs that utilize carefully constructed routing configurations that have been designed to accommodate virtually any sound reinforcement and installation application. The factory programs offer a clear and concise explanatory title to help get you up and running in a timely manner. These programs can also be used as templates or starting points for the user to create custom programs.

Selecting Programs:

The quickest way to get up and running with the DriveRack™ PA is to use any one of the factory programs that are available in the box. When you reach the factory program, a FACT icon will appear above the factory program name. From program mode, use the <DATA> wheel to scroll through the various programs. As each factory program is selected, the display will clearly indicate the title that is directly related to a specific application. Once a program is selected, press the <DATA> wheel to load the program. The display will appear something like this:

Navigation Modes

The function buttons of the DriveRack™ PA allow direct access to all editing and navigating functions of the DriveRack™ PA. The functions of the aforementioned buttons are as follows:

GLP

PL PL

F B

S U B

ROCK VENUE

FACT

3.2 Navigating Factory Programs

3.1 Program Definition

Operating Functions

Section 3

DriveRack

™

DriveRack™ PA User Manual

EQ modules in the input section and through EQ modules located in the output section.

WIZARD and AFS WIZARD.

Once you have reached the module that you wish to edit, simply use the <PREV PG> and <NEXT PG> buttons to move through the pages within the module. The <DATA> wheel is used to edit parameter values. The following illustration shows an example of the Comp module in edit mode:

Note that the arrow indicates the currently selected parameter for editing. To select parameters to edit from the current page, simply press the <DATA> wheel until the arrow is pointing to the parameter that you wish to edit.

Once you are satisfied with the changes that have been made to a factory or user program, the DriveRack™ allows you to save these changes as a custom USER program by pressing the <STORE> button, and the display will appear as follows:

DATA - SELECTS CHAR PREV/NEXTPG - LEFT/RIGHT: PRESS STORE TO ADVANCE

NAME: ROCK VENUE

Over Easy OFF

Compressor ON

COMP THR

-50 -30 -12 -5 0

-0+

3.3 Editing Factory Programs

Operating Functions

Section 3

DriveRack

™

DriveRack™ PA User Manual

• Rotating the <DATA> wheel will change the icons on the currently selected position.

• Pressing the <DATA> wheel will toggle between upper and lowercase letters, numbers

or symbols.

• Use the <PREV PG> and <NEXT PG> button to move icon positions.

• Once the desired title has been written, press the <STORE> button again and the dis-

play will now appear something like this:

• Rotate the <DATA> wheel to select the program to be replaced and press the <STORE>

button and the existing program will be replaced with the new program.

The DriveRack™ PA will store 25 user programs in addition to the 25 factory programs. Note: Factory programs cannot be over-written. When storing changes to a Factory program, you must replace an existing User program.

Replacing

PRESS STORE TO ADVANCE

STORE: ROCK VENUE

U1 DJ Setup

DETAILED

PARAMETERS

Section 4

DriveRack

™

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

Section 4

The DriveRack™ PA 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™ PA.

The DriveRack™ PA’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 edited 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.

The DriveRack™ PA 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 microphonic signal such as a guitar pickup or microphone is reproduced by an amplification and is repeatedly picked up in phase. The AFS uses Precision Frequency Detection and state-of-the-art processing 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™ PA 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. The following diagram shows AFS as opposed to 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 updated according to the current selected mode (Fixed or Live).

4.2 Feedback Eliminator

4.1 Pre-Crossover

Graphic EQ

Conventional Feedback Elimination

dbx AFS

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA 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.” If Clear (none) is selected, then nothing is displayed on this row. When the user moves to this third row and turns the Data Wheel (when Clear Live or Clear All is selected) then the filter reset is invoked.

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, thus remaining 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 during 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.

Type - Speech, Low Music, Medium Music and High Music

If Fixed or Live mode is chosen, the text will read “Type.” The options will be Speech, Music Low, Music Medium and Music High. These types pertain to the Q, sensitivity, and algorithm type. Values are; Speech (Bandwidth = 1/5 octave and Q=7.25) Music Low (Bandwidth = 1/10 octave and Q=14.5) Music Medium (Bandwidth = 1/20 octave and Q=29) Music High (Bandwidth = 1/80 octave and Q=116). Note: To guarantee that feedback is suppressed at lower frequencies, the AFS may place wider notch filters at these lower frequencies (below 700 Hz).

Number Fixed - 0-12

This will range from values 0-12. The total number of filters will stay at 12, and the number of live filters will be = Total Num Filters – Num Fixed. If this is changed before the filters are reset, then the filters will be reset one by one as the number changes. For example, if the number of Fixed filters goes down, then the last fixed filter set will be reset. Likewise, if the number of Fixed filters goes up (and thus the number of live filters goes down), then the last live filter set will be reset. The Fixed/Live filter usage will be indicated at the bottom of each page of the feedback elimination effect. ‘F’ indicates an available fixed filter, and ‘L’ indicates an available live filter. A blocked out F or L indicates a filter that is set, or in use.

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 characteristics of the venue change over time. As example; a filter placed minutes ago will not be presently preventing feedback. This feature removes unnecessary filters from the spectrum to increase sonic quality. If the feedback is still there (after the filter is removed), it will catch it and notch it out the same.

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

Section 4

The Subharmonic Synthesizer module has been specifically optimized to enhance Bass audio material for use in a variety of professional applications, including nightclub and dance DJ mixing, theatre and film sound, music recording, live music performance and broadcasting. The Subharmonic Synthesizer module’s two separate bands of subharmonic synthesis provide the best combination of smoothness and control, and the independent low frequency boost circuit is designed to get the most out of high-performance low frequency speaker systems.

Sub-Harmonic Synth - On/Off

Turns the Subharmonic Synth module on and off.

Sub-Harmonics Synth - 0 to 100%

This parameter sets the overall level of the Subharmonic Synthesizer.

24-36Hz and 36-56Hz (Subharmonic Synthesis) Level - 0 to 100%

These controls individually let you customize the amount of the respective synthesized frequencies to be added in, tuning the ultimate bass response of your system to taste. For example, if the sound is too woofy or growly, try turning down the 36Hz-56Hz level. If your woofers are bottoming out (making a ticking, popping sound), try turning down the 24Hz36Hz level. You may find that a setting produces fine results in one room, but produces too much boominess in another. If this occurs, adjust the controls as needed, (e.g., increase one or the other of the band levels). Experimentation will pay off with smooth, full, deeply extended bass. Remember, you are not selecting a frequency. You are controlling the overall level of each band.

The Crossover is used to divide the input signal into several frequency bands. This allows the user to drive the speaker in its optimum frequency range and send each output separately for more efficient use of amplifier power. The DriveRack™ PA Crossover can be configured as a 2x3, 4, 5, or 6. Appendix A.5 illustrates each of the available crossovers. The High frequency output is created using a High-Pass filter. The Mid and Low outputs are created using Band Pass filters consisting of Low-Pass and High-Pass filters. When editing Crossover parameters the frequency band is indicated by the highlighted H, M, or L in the top left corner of the screen. The High-Pass or Low-Pass filter being edited is indicated by the highlighted edge in the graphics area. For each Low-Pass filter there are two parameters:

Frequency

Adjusts the frequency of the Low Pass filter from 20 to 20KHz.

Type

Selects the filter type. Selections are BW 6,12,18,24 for Butterworth type filter with slope of 6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz-Riley type with slope of 12 or 24 dB/Octave.

For each High Pass filter there are three parameters and they are follows:

Frequency

Adjusts the frequency of the High Pass filter from 20 to 20KHz.

4.4 Crossover

4.3 Subharmonic Synthesizer

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

Type

Selects the filter type. Selections are BW 6, 12, 18, 24 for Butterworth type filter with slope of 6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz-Riley type with slope of 12 or 24 dB/Octave.

Gain

Adjusts the output gain of the current band from –INF to +20dB.

The crossover is stereo linked. Adjusting a parameter affects both the left and right outputs of the current frequency band. For the 2x3 and 2x5 Crossover, the Left and Right inputs are summed to produce a Mono signal that is processed by the Low Band Pass filter. After filtering, the Mono signal is fed to both the Left and Right of the Low band output.

In addition to the pre-crossover EQ options within the signal path, the DriveRack™ PA also offers a 2 or 3-band parametric EQ after the crossover section. The parameters for the postcrossover EQ are as follows and are user adjustable.

PEQ On/Off

Turns the PEQ band on and off. The following figure shows the constant Q parametric filter.

Flatten/Restore

This parameter either flattens the PEQ or restores the PEQ to its original shape.

Type

This parameter selects the PEQ type. Types include: 1. Bell-All parametrics are bell-shaped 2. HShelf - One shelf is High, while all others are bell 3. LShelf - One shelf is Low, while all others are bell and 4. LHShelf - One shelf is High and one is Low, and the others are bell.

Band (1-3) Frequency 20Hz to 20kHz

Selects the frequency of the selected band of the parametric EQ.

Level (1-3) -12dB to 12dB

Sets the peak level of the selected parametric EQ.

Q (1-3) 0.20 to 16 dB

Sets the Q or Bandwidth of the selected Parametric EQ.

4.5 Post-CROSSOVER PEQ

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

Section 4

The DriveRack™ PA also offers Compression and Limiter modules. The Compressor is a full bandwidth Stereo Compressor located prior to the Crossover. The Compressor is the perfect tool for tightening uneven signal sources such as vocals and guitars. The Limiters are located on each stereo output channel and have been strategically placed for speaker and amplifier protection. Note that Compressor/Limiter threshold metering can be observed on page two of the Utility section. The parameters for the Compressor/Limiter are as follows and are user adjustable.

COMPRESSOR

Compressor On/Off

Turns the Compressor module on and off.

OverEasy (O) Off to 10

There are ten levels of OverEasy® that can be used for the limiters. The point when the compressor starts to compress is the "knee." When the compressor starts to reduce the level of a signal abruptly as it passes over the threshold, this is called "hard knee" compression. OverEasy® (soft knee as it is sometimes called) is when the volume of the sound is compressed gradually. OverEasy® compression starts to compress before the level of the signal reaches the threshold and reaches full compression after the level has gone above the threshold. OverEasy® compression, by its very nature, sounds much smoother and more natural and will be used for most applications. When it is gentle (natural sounding or light) compression that you are looking for, the compressor offers VariKnee™. VariKnee™ gives you ten levels of OverEasy® compression to choose from (1 being almost hard knee and 10 being the most OverEasy®). This lets you choose the exact knee that is needed for the dynamic effect you are looking for.

Threshold (T) -40 to +20dBu

Threshold is the signal level at which the unit starts to compress the signal. If the level is set to

-10 dBu, than any signal larger than -10 dBu is compressed while any signal that has a level that is lower than -10dBu is left at the same signal level. Light compression is where only the loudest parts of the signal go over the threshold. Very heavy compression can be achieved by setting the threshold low enough that almost the entire signal content is over the threshold. For most signals the most natural compression is achieved when most of the signal content remains just below the threshold and only the peaks cross the threshold.

Ratio (R) 1.0 to Inf:1

Ratio is the amount the unit reduces the signal level of the sound that is above the threshold. A 2:1 ratio means that if the incoming signal is 2dB over the threshold the unit will compress the signal, and outputs a signal that only goes 1dB over the threshold. For light compression choose a lower ratio, while a heavy compression requires a higher ratio. A setting of Inf:1 makes the compressor act as a limiter.

Gain (G) -20 to +20 dB

This parameter is used to compensate for the gain lost during compression. By using heavy compression on a signal and then boosting the signal with the output gain, the user can create a signal that sounds much louder than it actually is.

4.6 Compressor/Limiter

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

LIMITER

Limiter On/Off

Turns the Limiter module on and off.

OverEasy (O) Off to 10

(soft knee as it is sometimes called) is when the volume of the sound is compressed gradually. OverEasy®compression starts to compress before the level of the signal reaches the threshold and reaches full compression after the level has gone above the threshold. This OverEasy

compression, by its very nature sounds much smoother and more natural and will be used for most applications. When it is gentle (natural sounding or light) compression that you are looking for, the compressor offers VariKnee™. VariKnee™ gives you ten levels of OverEasy®compression to choose from (1 being almost hard knee and 10 being the most OverEasy

). This lets

you choose the exact knee that is needed for the dynamic effect you are looking for.

Threshold (T) -40 to +20dBu

Threshold is the signal level at which the unit starts to compress the signal. If the level is set to

-10 dBu, any signal larger than -10 dBu is compressed while any signal that has a level that is lower than -10dBu is left at the same signal level. Light compression is where only the loudest parts of the signal go over the threshold. Very heavy compression can be achieved by setting the threshold low enough that almost the entire signal content is over the threshold. For most signals, the most natural compression is achieved when most of the signal content remains just below the threshold and only the peaks cross the threshold.

The DriveRack™ P A offers alignment delay to use for compensating signal delay that occurs due to internal speaker components such as horns, speakers and subwoofers within speaker cabinets. The alignment delay is also ideal to compensate for the difference in high and low frequency speed. The parameters for the alignment delay are as follows and are user adjustable:

Delay On/Off

Turns the Speaker Alignment delay on and off.

Units - Seconds, Feet or Meters

Selects the unit of measurement for the delay.

Length

Sets the amount of Speaker Alignment delay time. Delay times include: Seconds- 0.00-10.00 ms, Feet- 0.00-11.3 and Meters - 0.00-3.43. Fine adjustments are made in 20uS increments. Coarse adjustments are made in 21uS increments.

4.7 Alignment Delay

Detailed Parameters

Section 4

DriveRack

™

DriveRack™ PA User Manual

Section 4

USER NOTES

APPLICATION

GUIDE

Section 5

DriveRack

™

Application Guide

Section 5

DriveRack

™

This Application guide section is provided to offer suggested installation applications of the DriveRack™ PA that will allow you to optimize peak performance of the units. Note that the 25 included application programs represent the extensive flexibility of the DriveRack™ units. These applications can be used verbatim, or as sample reference guide templates for designing countless audio applications.

Hardware

1. Connect the outputs from the mixer to the inputs of the DriveRack™.

2. Connect the outputs of the DriveRack™ PA and run to the selected speaker amplifier.

3. Make sure that the mixer and power amps are turned off prior to powering up the

DriveRack™ PA.

Software

1. From Program mode, select factory program #F10 (SR4702 2X6) as a template, or use the

Wizard to setup the specific program.

2. Once the program has been chosen, press the DATA wheel to load the program.

5.1 2X6 Crossover

DriveRack™ PA User Manual

1202

Left Low

Right Low

MA-5002VZ

Left Sub

Left Mid

Left

SR4731XF

Right

Right Mid

Left High

MA-3600VZ

Left High

1202

Right Mid

Right High

MA-1202

Right High

SR4731XF

Right Sub

SR4719X

Hardware

1. Connect the outputs from the mixer to the inputs of the DriveRack™.

2. Connect the outputs of the DriveRack™ PA and run to the selected speaker amplifier.

3. Make sure that the mixer and power amps are turned off prior to powering up the

DriveRack™ PA.

Software

1. From Program mode, select factory program #F2 (3 Way w/mSub) as a template, or use the

Wizard to setup the specific program.

2. Once the program has been chosen, press the DATA wheel to load the program.

5.2- 2X5 Crossover

Application Guide

Section 5

DriveRack

™

DriveRack™ PA User Manual

Left

Right

Mono Low

Left Mid

Right Mid

Left High

SR4719X

Left High

Right Mid

Mono Sub

Right High

SR4731XFSR4731XF

Application Guide

Section 5

DriveRack

™

Hardware

1. Connect the outputs from the mixer to the inputs of the DriveRack™.

2. Connect the outputs of the DriveRack™ PA and run to the selected speaker amplifier.

3. Make sure that the mixer and power amps are turned off prior to powering up the

DriveRack™ PA.

Software

1. From Program mode, select factory program #F14 (MP212 2X4) as a template, or use the

Wizard to setup the specific program.

2. Once the program has been chosen, press the DATA wheel to load the program.

5.3 2X4 Crossover

DriveRack™ PA User Manual

Left Low

Left

ht Lo

Left High

MP412 MP412

Right

MP4718SP Powered

Right High

MP4718S Non-Powered

Application Guide

Section 5

DriveRack

™

DriveRack™ PA User Manual

Hardware

1. Connect the outputs from the mixer to the inputs of the DriveRack™.

2. Connect the outputs of the DriveRack™ PA and run to the selected speaker amplifier.

3. Make sure that the mixer and power amps are turned off prior to powering up the

DriveRack™ PA.

Software

1. Use the Wizard to setup the specific program.

2. Once the program has been chosen, press the DATA wheel to load the program.

5.4 - 2X3 Crossover

Left

Right

Mono Low

Left High

Right High

EON15 G2EON15 G2

MP4718S Non-Powered

Application Guide

Section 5

DriveRack

™

USER NOTES

DriveRack™ PA User Manual

Appendix

DriveRack

™

DriveRack™ PA User Manual

Appendix A

DriveRack

™

In the event that a reset is required, the DriveRack™ PA offers you the option of performing a “Soft” or “Hard” reset. The Soft Reset resets all operating parameters except user programs. The Hard Reset Procedure will reset all programmable information back to the factory defaults.

All Power-Up Functions require a button(s) to be pressed and held as the unit power is turned on.

DriveRack PA Power-Up Button Functions Factory (“Hard”) Reset.

Press and hold the <STORE> button at power-up until the following message appears:

“! HARD RESET?”

“Yes <PREV PAGE>”

“No <PROGRAM>”

•Pressing the <PREV PAGE> button will start a Factory Reset (All User Programs will become

copies of the Factory Programs, all Utility settings will be defaulted, and all Security settings will be defaulted).

• Pressing the <PROGRAM> button will abort the Factory Reset sequence and the unit will reset normally.

System (“SOFT”) Reset

• Press and hold the <UTILITY> button at power-up until the following message appears:

“! SOFT RESET?”

“Yes <PREV PAGE>”

“No <PROGRAM>”

• Pressing the <PREV PA GE> button will start a System Reset (All Utility settings will be defaulted.)

•Pressing the <PROGRAM> button will abort the System Reset sequence and the unit will reset normally.

The DriveRack™ PA offer several “Quick Key” options for initial power up and are as follow:

Change Initial Program Number

• To change the initial power program number, Press and hold the <PROGRAM> button at power-up until the following message appears:

Use Wheel to”Change Restart”Program Number”

• Turning the <DATA> wheel will select the program you wish to load at initial reset.

• Press the <PROGRAM> button again when the selection is complete. Nor mal resetting will continue.

System Lock Out

• Press and hold <WIZARD> at power-up until one of the following messages appears:

System Unlocked All user input will be accepted

System Locked No user input will be accepted

• Rotating the <DATA> wheel to select either Lock, Unlock or Filter Unlocked the system.

• Pressing <PREV PAGE> will unlock the system if it were locked or it will lock the system if it were unlocked.

• If you wish to leave the system locked with the exception of being able to clear the feedback filters, follow the same

procedure on power up and then rotate the <DATA> wheel to select the feedback filter unlock feature.

• Pressing any other button will abort the System Lockout sequence and the unit will reset normally.

A.2 Power Up Quick Key Options

A.1 Factory Reset

Analog Inputs:

Number of Inputs: (2) Line inputs. (1) RTA Mic input Connectors: (2) Female XLR line inputs, XLR RTA Mic input Type: Electronically balanced/RF filtered Impedance: > 40k Ω Max input line level: +20dBu CMRR: > 45dB RT A Mic Phantom Voltage: +15VDC RTA Mic EIN: < -117dBu, 22Hz-22kHz, 150Ω

Analog Outputs:

Number of Outputs: (6) Line Outputs Connectors: Male XLR Type: Electronically balanced, RF filtered Impedance: 120 ohms Max Output Level: +20dBu Alignment Delay: 10ms per channel (60ms total)

A/D Performance:

Type: dbx Type IV conversion system Dynamic Range: >107 dB unweighted, >110 dB A-weighted Type IV dynamic range: 123 dB with transient material, A-weighted, 22kHz BW 121 dB with transient material, unweighted, 22kHz BW 115

dB typical with program material, A-weighted, 22kHz BW

Sample Rate: 48kHz

D/A Performance:

Dynamic Range: 112 dB A-weighted, 110dB unweighted

System Performance:

Dynamic Range: 110 dB unweighted, >107dB weighted, THD+N: 0.002% typical at +4dBu, 1kHz, 0dB input gain Frequency Response: 20Hz – 20kHz, +/- 0.5dB Interchannel Crosstalk: >110dB, 120dB typical Crosstalk input to output: >100dB

Power Supply:

Operating Voltage: DO: 100-120VAC 50/60 Hz - EU: 220-240 VAC 56/60 Hz, Power Requirements: 25 Watts

Physical:

Weight: 5.5 lbs.(2.5 kg) Shipping weight 7 lbs. (3.18 kg) Dimensions: 1.75” H x 5.75” D x 19” W

By using the setup wizard, cross over output gains and post cross over parametric EQ settings are set to match your system. The Auto-EQ can be used to adjust your system to compensate for room effects, and adjust the response of the entire system to your liking. After allowing Auto EQ to “pink the room” your system will sound tighter. The low end will have more definition, the mids will be more intelligible, and the highs can be tamed. Here are two things to look for to get the best performance from the Auto-EQ.

Look out for Modes

Some speaker and RTA microphone positions will result in certain frequencies canceling out. The resulting modes can not be corrected with equalization. The Auto-EQ does not detect modes in the frequency response, so may try to boost a band to compensate for a mode with

A.4 Auto EQ Optimization Tips

A.3 Specifications

Appendix A

DriveRack™ PA User Manual

DriveRack

™

DriveRack™ PA User Manual

Appendix A

DriveRack

™

out positive affect. You may be able to see if a lifted band is a mode by manually adjusting a lifted EQ band - if no change in the EQ is perceived, you probably are seeing a mode in your frequency response. To reduce the effect of this mode, try different microphone positions and adjust the location of your speakers, then repink the room for a more effectual Graphic EQ adjustment.

Adjust Cross Over Output Gains

If your system setup or the response you have chosen results in the Auto-EQ lifting or cutting a number of consecutive bands of the Graphic EQ, you can adjust the level of the associated cross over output gain to match the average boost or cut in the graphic EQ and repink your room. This time, the adjustment of the Graphic EQ bands will be less “heavy handed” and the system will sound better having fewer phase problems and a lower noise floor than a more aggressively adjusted Graphic EQ. With the rest of your system properly adjusted, the Auto EQ can compensate for room resonance and adjust to suit personal taste without large excursions in the Graphic EQ bands.

A.5 Crossover Diagrams

2X2

2X5 (3-band)

2X3(2-band)

L Mono

2X4(2-band)

2X6 (3-band)

A.6 Block Diagram

Appendix A

DriveRack™ PA

DriveRack™ PA User Manual

Left High

Outputs

Meters

Alignment Delay Alignment Delay Alignment Delay

Peak Stop Limiter Peak Stop Limiter Peak Stop Limiter

3-Band PEQ 2-Band PEQ 2-Band PEQ

Stereo Compressor

SubHarmonic Synth

Right High

Crossover Section - (2X3, 4,5,6)

Left Mid

Right Mid

Left Low

Right Low

AFS Notch Filters

GEQ

Meters

Stereo/Mono

Pink Noise

Left Input

GEQ

Right Input

RTA

Micr Pre amp

Mic Input

DriveRack™ PA User Manual

Appendix A

DriveRack™ PA

A.7 Program List/ Speaker Tunings/ Power Amp Tunings

PROGRAM LIST

1) Stereo 3Way

2) 3Way w/mSub

3) Stereo 2Way

4) 2Way w/mSub

5) Full Range

6) DJ Setup

7) Disco Smile

8) Rock Venue

9) SR4702 2X6

10) SR4722 2X6

11) SR4725 2X6

12) SR4726 2X6

13) SR4735 2X4

14) MP212 2X4

15) MP225 2X4

16) MP410 2X4

17) MP415 2X4

18) EON1500 2X4

19) SF15 2X4

20) SF25 2X4

21) FR159z 2X4

22) S112IV 2X4

23) C300 2X4

24) Elim i 2X4

25) V152 2X4

SPEAKER TUNINGS

MAINS

1) JBL SRX SR4702X

2) JBL SRX SR4722X

3) JBL SRX SR4725X

4) JBL SRX SR4726X

5) JBL SRX SR4731X

6) JBL SRX SR4732X

7) JBL SRX SR4733X

8) JBL SRX SR4735X

9) JBL MPro MP212

10) JBL MPro MP215

11) JBL MPro MP225

12) JBL MPro MP410

13) JBL MPro MP412

14) JBL MPro MP415

15) JBL EON1500

16) JBL EON10G2

17) JBL EON15G2

18) JBL SndFactor SF15

19) JBL SndFactor SF25

20) EAW FRz FR129z

21) EAW FRz FR159z

22) EAW FRz FR153z

23) Yamaha S112IV

24) Yamaha S115IV

25) Yamaha S215IV

26) Mackie C300

27) Mackie S500

28) EV Elim i

29) Cerwin-Vega V152

30) Cerwin-Vega V122

31) Custom

SUBWOOFERS

32) JBL SRX SR4715X

33) JBL SRX SR4718X

34) JBL SRX SR4719X

35) JBL MPro MP418S

36) JBL MPro MP418SP

37) JBL MPro MP255S

38) JBL EON SUB G2

39) JBL SndFactr SF22SP

40) EAW FRz FR250Z

41) Yamaha SW118iv

42) Yamaha SW215iv

43) EV Elim iS

44) Cerwin-Vega SUB 18B

45) Cerwin-Vega SUB 15

46) Custom

AMPLIFIER TUNINGS

1) Crown XLS 202

2) Crown XLS 402

3) Crown XLS 602

4) Crown CE 1000

5) Crown CE 2000

6) Crown CE 4000

7) Crown PowerTech 1.1

8) Crown PowerTech 2.1

9) Crown PowerTech 3.1

10) Crown K1

11) Crown K2

12) Crwn MacroTech 1202

13) Crwn MacroTech 2402

14) Crwn MacroTech 3600

15) Crwn MacroTech 5000

16) Custom

The DriveRack PA offers a wide range of tools for sound system design and setup. These tools can make your system more efficient and better sounding, but to get the best possible sound it is important to use these tools properly. In the DriveRack PA we have included a Wizard setup tool to help in system setup. If you use the Wizard to set up your DriveRack PA it will automatically set the limiters for some amplifier selections. If your amplifiers are not available in the Wizard, you should choose the Custom setting. The following section explains how to maximize system gain and how to use the limiters to protect your amplifiers from clipping.

In traditional system design, the output of your console would be routed to a system EQ, a compressor, and a crossover with output level control. From the crossover, there may be additional filters that are employed to improve the response of your speakers. There may also be limiters set up to keep your amplifiers from going into clipping and protect your speakers from the hazards of a clipped signal. Your amplifiers play a vital role in system setup, because they are last item in the chain before your speakers and offer the greatest amount of gain (that is their job after all). If your amplifiers are incorrectly setup you will not be using your system to its fullest potential and could be harming your speakers.

One thing that is critical to system setup is maximizing gain structure. Gain structure refers to aligning the gain of each device so that they all clip at the same point, and the noise floor of the entire system is at its absolute minimum. Quite often PA systems are setup with the amplifier input controls turned all the way up in the incorrect assumption that this is the only way to get the maximum output level. Amplifiers are fixed gain devices, turning down the amplifier input attenuators does not change the potential output of the amplifier; it only requires more input voltage to get full output power. Many amplifiers will clip with an input level greater than +6 dBu when the input attenuators are turned all the way up. Most mixing consoles can deliver over +18 dBu of output level before clipping. This means that with your amps tuned all the way up you are sacrificing 12 dB of headroom, resulting in poorer noise performance and the potential of system clipping. By adjusting the amplifier controls properly, you can maximize your system performance.

A way to set up your amplifiers for maximum gain structure is to use the clip indicators of the console and amplifiers themselves. Disconnect the output of the amplifier from the speakers. Run a continuous signal (pink noise or sine waves – many test CDs are available that have these types of signals) through your console. Turn up the output of the console until it begins clipping. If there is no clip indicator on the console then use the output meters; most reputable console manufacturers use red LEDs at the top of the meters to show the onset of clipping. Once the console is clipping, back the output gain down slightly until the clip indicator turns off. Run this signal through the DriveRack PA and into the amplifiers with the crossovers and output gain section in the DriveRack PA set for your particular speakers. Make sure that the output limiters are turned off. Run this signal into the amplifiers and turn up the input attenuators until the amplifier clip indicator begins to turn on. Turn the attenuators down slightly, so the clip indicator no longer is on. Y ou have just maximized the gain through your system. This amplifier setting should give you maximum gain without clipping, another way of say this is that when the output of your console is clipping you will also be at the clip point of your amplifiers.

A.8 System Setup and Gain Structure

Appendix A

DriveRack™ PA

DriveRack™ PA User Manual

Appendix A

DriveRack

™

Once you have found the clip point of your amplifiers, you can mark this position and turn the amplifiers back up to the point where they are clipping. You can now use the output limiters in the DriveRack PA to protect the amplifier from clipping no matter what you do at the console. With the amplifiers clipping, now go to the Limiter page of the DriveRack PA and turn the limiter for each output band on. Make sure that the threshold is all the way up to +20dB. Now slowly reduce the threshold until the clip indicator of the amplifier turns off. You have successfully set the output limiter up and the amplifier will not be able to go into clipping no matter what the input is. Y ou should now proceed to the next output band and go through the same process. If you are using a sine wave to create clipping in your amplifier you should make sure that the sine wave is within the frequency range of the output band that your are working with. Once all the limiters are set up you can now turn the amplifiers back down to the gain maximized position. The Wizard will automatically set your limiters based on your choice of amplifier. Because of component variances within the amplifier circuitry, you may need to adjust the limiter settings by a few dB after running the Wizard to ensure that they are set correctly.

Once all the limiters are set up and the gain is maximized, reduce the output of your console and reconnect your speakers. Now for the fun part, sit back and send your favorite music through the system. If your system is not loud enough, you may want to consider an amplifier or amplifiers with greater output power. Most loudspeaker manufacturers recommend an amplifier that can provide 1.5 to 2 times the rated RMS power of the speaker. If this setting is too loud when your speakers are reconnected you can turn down the amplifier input attenuators even more.

8760 South Sandy Parkway • Sandy, Utah 84070

Phone: (801) 568-7660 • Fax (801) 568-7662

Int’l Fax:(801) 568-7583

E-mail us at: customer@dbxpro.com or visit us on

the web at:www.dbxpro.com

18-1790-A

A Harman International Company

Dbx DRIVERACK PA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual