BSS Audio DPR 522 Manuale utente

DPR 522

User Manual

This equipment has been tested and found to comply with the following European and

international Standards for Electromagnetic Compatibility and Electrical Safety:

Radiated Emissions (EU): EN55013 (1990) Associated Equipment

RF Immunity (EU): EN50082/1 (1992) RF Immunity, Fast Transients ESD

Mains Disturbance (EU): EN61000/3/2 (1995)

Electrical Safety (EU): EN60065 (1993)

Radiated Emissions (USA): FCC part 15 Class B

Electrical Safety (USA): UL813/ETL (1996) Commercial Audio Equipment

Electrical Safety (CAN): UL813/ETLc (1996) Commercial Audio Equipment

IMPORTANTSAFETYINFORMATION

DO NOT REMOVE COVERS. NO USER SERVICEABLE PARTS INSIDE, REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL. THIS EQUIPMENT MUST BE EARTHED.

IT SHOULD NOT BE NECESSARY TO REMOVE ANY PROTECTIVE EARTH OR SIGNAL CABLE SHIELD

CONNECTIONS TO PREVENT GROUND LOOPS. ANY SUCH DISCONNECTIONS ARE OUTSIDE THE

RECOMMENDED PRACTISE OF BSS AUDIO AND WILL RENDER ANY EMC OR SAFETY CERTIFICATION

VOID.

For continued compliance with international EMC legislation ensure that all input and output cables are wired

with the cable screen connected to Pin 1 of the XLR connectors and/or the jack plug sleeve. The input XLR Pin

1 and the side-chain input jack socket sleeve are connected to the chassis via a low value capacitor, providing

high immunity from ground loops whilst ensuring good EMC performance.

V 1.0 JMK 11June1997

Please read

We have written this manual with the aim of helping installers, sound engineers and musicians alike to get the

most out of the DPR-522. We recommend that you read this manual, particularly the section on installation,

before attempting to operate the unit.

The manual is split into two main sections. The first deals with quick reference information, regarding the

functions and operation of the unit, while the second covers a more general background to use and application

of the DPR-522.

We welcome any comments or questions regarding the DPR-522 or other BSS products, and you may contact

us at the address or World Wide Web site given in the warranty section.

Contents

1.0 Mechanical installation 5

2.0 Mains Power Connection 6

2.1 Mains Power 6

3.0 Introduction 7

4.0 Unpacking 7

5.0 Audio Connections 10

5.1 Main Inputs 10

5.2 Main Outputs 10

5.3 Key returns 11

5.4 Key send 12

6.0 Control Operations 13

6.1 Channel In 13

6.2 Key filter 13

6.3 Width 13

6.4 Key listen 14

6.5 Ext key 14

6.6 Threshold 14

6.7 Key level meter 15

6.8 Range 15

6.9 Attack 16

6.10 ADE 16

6.11 Hold 17

6.12 Release 17

6.13 Open check 17

6.14 Duck mode 18

6.15 Stereo link 18

6.16 Gate open indicator 19

6.17 Key send connector 20

6.18 Key return connector 20

6.19 Control connector 20

Contents

7.0 Beginners guide 22

7.1 What are gates for? 22

7.2 Basic operation 23

8.0 General applications 24

8.1 Basic gating 24

8.2 Frequency conscious gating 24

8.3 Ducking 25

8.4 Using the Key filter as EQ 25

9.0 Warranty Information 26

10.0 Specifications 27

11.0 Glossary 28

Index 30

User Notes 32

Mechanical Installation

1.0 Mechanical installation

A vertical rack space of 1U (1¾" / 44.5 mm high) is required, with a depth of

190mm. Ventilation gaps are unnecessary (See Figure 1.1).

If the unit is likely to undergo extreme vibration through extensive road

trucking and touring, it is advisable to support the unit at the rear and/or sides

to lessen the stress on the front mounting flange. The necessary support can

generally be bought ready-built as a rack tray, or the DPR-522 can be

mounted between other units. Damage caused by insufficient support is not

covered in the warranty. To prevent damage to the paintwork on the front

panel, always use protective plastic cups or washers underneath the rack

mounting bolts.

As with any low-level signal processing electronics, it is best to avoid

mounting the unit next to a strong source of magnetic radiation or heat, such

as a high power amplifier.

Fig 1.1 Unit dimensions.

Fig 1.2 Rack

dimensions.

Mains Power Connection

2.0 Mains Power Connection

2.1 Mains Power WARNING! THIS APPLIANCE MUST BE EARTHED.

The DPR-522 must always be connected to a 3-wire earthed AC outlet. The

rack framework must also be connected to the same grounding circuit. The

unit must NOT be operated unless the power cables' EARTH (ground) wire is

properly terminated - this is important for personal safety as well as for proper

control over the system grounding.

The wires in the mains lead are colour coded in accordance with the

following code.

Green and Yellow......Earth

Blue......Neutral

Brown......Live

Those units supplied to the North American market will have an integral

moulded 3 pin connector which is provided to satisfy required local standards.

IMPORTANT: The DPR-522 is designed to use 50/60Hz AC power in one of

the two voltage ranges, selectable with the mains voltage selector switch on

the rear of the unit. It is vital that the position of this switch is checked

BEFORE initial power up to ensure that it matches the local mains supply.

Acceptable input AC supply voltages range from:

115V switch position - 90V to 132V

230V switch position - 190V to 265V

The application of voltages outside these ranges may cause permanent

damage or erratic operation of the unit, and will invalidate the warranty.

IMPORTANT: The mains fuse carrier on the rear of the unit must be fitted with

the correct type and rating of fuse, depending on the position of the mains

voltage selector switch:

115V switch position - T315mAfuse

230V switch position - T200mAfuse

In the unlikely event of the mains fuse failing without good reason,

DISCONNECT THE UNIT FROM THE MAINS SUPPLY, and always replace

with the appropriately rated fuse (as specified above) for continued protection

against damage and fire.

Note: For USA and Canadian users, the replacement fuse must be of an

identical UL rated type fuse for continued compliance with safety standards.

3.0 Introduction

The BSS DPR-522 is a dual channel high performance professional noise gate

which has been designed to be simple and intuitive to use. Many of the

facilities provided on the unique BSS DPR-502 unit, such as the parametric

key filters and key signal metering have been incorporated, with some new

features added.

One unique feature of BSS gates, featured in the DPR-522, is the adoption of

true logarithmic audio level control during both the attack AND release

phases. This ensures the most natural sounding fades, which are very

important if long attack or release times are used.

The provision of balanced key send and return signals minimises the

possibility of interference, which other units with unbalanced connections

may suffer from, whilst having separate send and return connectors eases the

integration of other equipment with the DPR-522.

To further enhance the unit's flexibility, extensive control of the DPR-522 is

possible using external DC control signals and switches; inputs are available

to remotely trigger the gate or inhibit it. Both contact closure and logic signals

may be used for this. In addition a signal is provided by the DPR-522 when the

gate opens, which may be used to trigger other external equipment.

Introduction

Unpacking

4.0 Unpacking

As part of the BSS system of quality control, we check every product carefully

before packing to ensure that it reaches you in flawless condition.

Before you go any further, please check the unit for any physical damage and

retain the shipping carton and all relevant packing materials for use, should

the unit need returning.

In the event that damage has occurred, please notify your dealer

immediately, so that a written claim to cover the damages can be initiated.

Check out section 9.0; warranty section, for more info on the warranty, and

also to record your dealer details.

The DPR-522

Fig 4.2 Rear Panel

Fig 4.1 Front Panel

All numbers in bubbles refer to Section numbers.

522

5.0 Audio Connections

5.1 Main Inputs There are 2 input sockets on the rear panel of the 522, Inputs 1 and 2. Each is

electronically balanced on standard 3 pin female XLRs at an impedance

greater than 10k Ohms. The ‘HOT, + or in phase’ connection is to pin 2 and

the ‘COLD, -, or out of phase’ connection is to pin 3. Pin 1 is internally

connected to the chassis earth via a low value capacitor. This ensures

freedom from ground loops whilst allowing good EMC performance. The

screen of the input cable should be connected to pin 1 to ensure that EMC

regulations are being met, and the cable shield ground should also be

connected to the equipment which is providing the input signal.

When feeding the DPR-522 from unbalanced sources, connect the signal

conductor to pin 2 and the cable screen to pins 1 and 3. Transformer isolated

inputs are available as a dealer fitted option.

Audio Connections

5.2 Main Outputs The output signals are electronically balanced and fully floating on 3 pin

male XLRs. Full headroom is available into any load of 600 Ohms or greater.

The signal ‘HOT, +, or in phase’ signal is to pin 2, the ‘COLD, -, or out of

phase’ signal is to pin 3, with pin 1 being connected directly to the chassis.

Fig 5.1

Fig 5.2

Fig 5.3

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