Dbx PX Manuale utente

User Manual

Powered Speaker Optimizer

Featuring

Powered Speakers

WARNING FOR YOUR PROTECTION

PLEASE READ THE FOLLOWING:

KEEP THESE INSTRUCTIONS

HEED ALL WARNINGS

FOLLOW ALL INSTRUCTIONS

THE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING LIQUID AND NO OBJECT

FILLED WITH LIQUID, SUCH AS VASES, SHALL BE PLACED ON THE APPARATUS

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

PERIODS 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 recep-

tacles, 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 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.

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.

SAFETY INSTRUCTIONS

NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD.

WARNING: THIS APPLIANCE SHALL BE CONNECTED TO A MAINS SOCKET OUTLET WITH A

PROTECTIVE EARTHING CONNECTION.

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.

CONDUCTOR WIRE COLOR

Normal Alt

L LIVE BROWN BLACK

N NEUTRAL BLUE WHITE

E EARTH GND GREEN/

YEL GREEN

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 INFORMATION

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: DriveRack PX

Note: Product name may be suffixed by the EU.

Product option: None

conforms to the following Product Specifications:

Safety: IEC 60065 (7th ed. 2001)

EMC: EN 55013 (2001+A1)

EN 55020 (1998)

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.

Director of Engineering - dbx

8760 S. Sandy Parkway

Sandy, Utah 84070, USA

Date: January 23, 2008

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

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 interfer-

ence that may cause undesired operation.

Operation of this unit within significant

electromagnetic fields should be avoided.

use only shielded interconnecting cables.

•

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.

If you want to dispose this product, do not mix it with general household waste. There is a

separate collection system for used electronic products in accordance with legislation that

requires proper treatment, recovery and recycling.

Private household in the 25 member states of the EU, in Switzerland and Norway may return their used

electronic products free of charge to designated collection facilities or to a retailer (if you purchase a similar

new one).

For Countries not mentioned above, please contact your local authorities for a correct method of disposal.

By doing so you will ensure that your disposed product undergoes the necessary treatment, recovery and

recycling and thus prevent potential negative effects on the environment and human health.

IMPORTANT SAFETY INFORMATION

Section 1- Introduction ......................... 1

0.1 Defining the DriveRack PX............... 1

0.2 Service Contact Info....................... 2

0.3 Warranty....................................... 3

Section 2- Getting Started ..................... 4

2.1 Rear Panel Connections .................. 4

2.2 Front Panel Connections ................. 4

2.3 Quick Start ................................... 6

2.4 DriveRack PX Wizard....................... 8

Section 3 - Editing Functions.................. 15

3.1 Basic Navigation Modes .................. 15

3.2 Button Array Overview.................... 15

3.3 Navigating the High-pass and

Bandpass Filter (SETUP) Section ...... 16

3.4 Navigating the

Subharmonic Section...................... 16

3.5 Navigating the

Comp/Limiter Section..................... 17

3.6 Navigating the EQ Section .............. 17

3.7 Navigating the AFS Section ............. 18

3.8 Navigating the Utility Section ......... 18

3.9 Navigating the Wizard Section......... 18

3.10 Navigating the Recall Section ........ 19

3.11 Navigating the Store Section ......... 19

Section 4 - Operating Functions............... 20

4.1 Preset Definition ........................... 20

4.2 Navigating Factory Presets .............. 20

4.3 Editing Factory Presets................... 21

Section 5 - Detailed Parameters ............... 23

5.1 Stereo Input Graphic EQ ................. 23

5.2 AFS (Automatic Feedback

Suppression)....................................... 23

5.3 Subharmonic Synthesizer ................ 25

5.4 Compressor/Limiter........................ 26

5.5 Filter (SETUP) .............................. 28

5.6 Output Parametric EQ (3-band)........ 28

Section 6 - Application Guide................... 29

6.1 Mains-Only Setup (No Subs) ............ 29

6.2 Two Mains/One Subwoofer Setup...... 30

6.3 Two Mains/Two Subwoofers Setup .... 31

6.4 Sub with Satellites Setup................ 32

Section A - Appendix............................... 33

A.1 Factory Reset................................ 33

A.2 Power Up Quick Key Options............ 33

A.3 Specifications ............................... 35

A.4 Auto-EQ Optimization Tips.............. 36

A.5 Crossover Diagrams ........................ 36

A.6 Block Diagram............................... 37

A.7 Preset List / Supported Speakers ..... 38

A.8 System Setup and Gain Structure ..... 39

DriveRack®PX

Table of Contents

Section 1- Introduction

The dbx DriveRack® PX Powered Speaker Optimizer has everything you need to get the most

out of your stereo powered speaker system. It even includes stereo or mono subwoofer

support. With the included dbx M2 measurement mic, Auto-EQ corrects for audible

deficiencies in the room environment. Our patented Advanced Feedback Suppression (AFS™)

kills nasty feedback, allowing problem-free operation at higher sound levels, while our

patented Subharmonic Synthesizer™ extends bass response for enhanced bottom end. With

all that, you also get classic dbx compression and the protection offered by our graceful

PeakPlusTM limiting. Your ears, your audience, and your powered speakers will forever thank

you.

0.1 Deﬁning the DriveRack PX

The dbx DriveRack PX is the most effective way to manage all aspects of powered loudspeaker

management for public address system applications. The DriveRack PX essentially becomes the

only device that you will need between the mixer and the powered speakers. The following

are just some of the features of the DriveRack PX.

DriveRack® PX features:

Stereo Feedback Elimination with 12 feedback notch ﬁlters

Stereo 28-band Graphic EQ

Classic dbx® Compressor

120A Subharmonic Synthesizer

Stereo Multi-band Parametric EQ

Stereo PeakPlus™ Limiters

Pink Noise Generator

Auto-EQTM with 28-Band RTA

JBL® and other popular powered speakers included in Setup Wizard

JBL® preset speaker combinations

dbx M2 Measurement Mic and zippered pouch included

Front panel RTA-Mic XLR input with phantom power

25 User Programs / 25 Factory Programs

2 Channel XLR Input

2 Channel XLR Output

2 Channel XLR Sub Output

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

dbx Type IVTM Conversion System

Full Graphic LCD Display

By including every form of processing necessary to drive the signal from the mixer to the

power amp, the DriveRack® PX allows you to eliminate all other processing devices normally

found in large and cumbersome traditional drive rack systems of the past.

The DriveRack PX Powered Speaker Optimizer includes two balanced XLR inputs and two

balanced XLR outputs, as well as two balanced XLR subwoofer output connectors.

•

DriveRack®PX Section 1

Introduction

0.2 Service Contact Info

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 bottom 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 first

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

end-user. 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.

DriveRack®PX

Section 1 Introduction

0.3 Warranty

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

defective 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 first 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.

DriveRack®PX Section 1

Introduction

2.1 Rear Panel Connections

GND

SUB OUTPUTS

Manufactured under the following U.S. Patents:

3,789,143; 4,182,993; 6,195,029; 7,203,324.

UL 60065 IEC 60065

120V - 60Hz

IEC Power Cord Receptacle

The DriveRack® PX comes with a power supply that will accept voltages ranging from 100V-

120V at frequencies from 50Hz-60Hz. An IEC cord is included. EU versions accept 220V-240V

at frequencies from 50Hz-60Hz.

Sub Outputs Left/Mono and Right

Connect your subwoofer(s) here (optional).

Outputs Left and Right

Connect your main speakers here.

Inputs Left/Mono and Right

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

Ground Lift Switch

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

+4dBu / –10dBV Switch

This switch selects between –10dBV and +4dBu nominal operating levels. When the switch is

in the “in” position, the –10dBV operating level is selected. When the switch is in the “out”

position, +4dBu is selected.

2.2 Front Panel Connections

SETUP

AFS

RECALL

SUBHARMONIC

COMP/LIMITER

UTILITY

PRESET

NEXT PG

STORE

WIZARD

Inputs Sub Outs

UTILITY

PREV PG

WIZARD

SIG

Headroom dB Headroom dB Headroom dB

Outputs

Limiter

DriveRack PX

Powered Speaker

Optimizer

SIG

RTA Mic Input Jack

This balanced XLR input is used for the connection of the dbx M2 RTA microphone, which

allows the user to optimize the powered speaker settings and the EQ settings of any room

through the use of the System Setup and Auto-EQ Wizards.

RTA MIC Input Selector

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

start the Auto-EQ wizard.

DriveRack®PX

Section 2 Getting Started

Section 2- Getting Started

Data Wheel

The Data wheel of the DriveRack® PX is used to scroll through the preset menu, load presets,

select parameters and edit parameter values.

LCD Display

The backlit LCD display of the DriveRack® PX provides the user with all of the vital processing

information of the DriveRack® PX including: signal routing, effect block editing and Wizard

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® PX allow direct access to all editing and navigating

functions of the DriveRack® PX. The functions of the aforementioned buttons are as follows:

<PREV PG> - Moves to the previous page in the currently selected menu.

<NEXT PG> - Moves to the next page in the currently selected menu.

<SETUP> - Press and release to enter the high-pass and bandpass filter editor. Press and hold

to enter the first page of the Powered Speaker Setup Wizard.

<SUBHARMONIC> - Press and release to enter the dbx 120A Subharmonic Synthesizer editor.

<COMP/LIMITER> - Press and release to cycle through the compressor editor and output

limiter processing editor.

<EQ> - Press and release to cycle through the graphic EQ and parametric EQ editors. Press

and hold to enter the first page of the Auto-EQ Wizard.

<PRESET/[RECALL]> - Press and release to return to the preset view, showing preset number,

preset bank (user or factory), preset name, and signal path. Press and hold to activate the

[RECALL] button function which allows the selection and loading of a new preset.

<STORE/[UTILITY]> - Press and release to enter the Store menu, which allows the user to

store the current state to a user preset. Press and hold to enter the UTILITY menu to adjust

LCD contrast, Auto-EQ plot selection (RTA or GEQ), and Sales Banner on/off.

<AFS> - Press and release to enter the AFS editor. Press and hold to enter the first page of

the AFS Wizard.

Stereo Input Meters

The DriveRack® PX provides the user with two independent six segment input meters that

range from Signal Present (–48 dBFS) to 0 dBFS (maximum output). These meters monitor the

signal level right after the input module.

Stereo Output Meters

The DriveRack® PX provides the user with two independent six-segment output meters that

range from Signal Present to 0 dBFS (maximum output).

Mono/Stereo Subwoofer Output Meters

The DriveRack® PX provides the user with two independent six-segment subwoofer output

meters that range from Signal Present to 0 dBFS (maximum output).

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.

DriveRack®PX Section 2

Getting Started

2.3 Quick Start

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® PX.

Signal Path Block Diagram

The following diagram shows the logical and intuitive signal path of the input, signal

processing modules, and output of the DriveRack® PX.

GEQ

Meters

Left (Mono) Input

Right Input

Left

Right

Left (Mono)

Right

Mic Input

Outputs

Stereo Compressor

AFS Notch Filters

SubHarmonic Synth

3-Band PEQ2-Band PEQ

PeakPlus LimiterPeakPlus Limiter

High-Pass and

Band-Pass Filter Section

Stereo/Mono

Pink Noise

Micr Pre amp

RTA

Meters

Sub Outputs

Connections

When setting up the DriveRack® PX, make connections as follows:

Always make connections prior to applying power to the unit.

Connect the output from the sending device (mixer) to one or both of the two XLR

input connectors shown below.

Make output connections from “Outputs” XLR connectors shown below to the inputs of

the powered speakers.

If a subwoofer or subwoofers are to be used, make output connections from “Sub

Outputs” XLR connectors shown below to the inputs of the subwoofers.

GND

SUB OUTPUTS

Manufactured under the following U.S. Patents:

3,789,143; 4,182,993; 6,195,029; 7,203,324.

UL 60065 IEC 60065

120V - 60Hz

If you will be “pinking” the room through the use of the RTA, connect the dbx M2 RTA

microphone to the front-panel XLR input.

IMPORTANT- It is imperative that the powered speakers are turned off prior to applying

power to the DriveRack® PX. Always make sure that your powered speakers are the last

item turned on and the first turned off.

•

DriveRack®PX

Section 2 Getting Started

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