BSS Audio DPR-944 Manual de usuario
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DPR 944
User Manual
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An example of 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
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 BV/JMK 17November1997
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 944. We recommend that you read this manual, particularly the section on installation,
before attempting to operate the unit.
Because of the operational nature of the DPR 944, this manual is split into three main sections. The first and
second deal with the operation and applications of the compressor and gate sections respectively, while the
third covers a more general background to use and application of the unit.
We welcome any comments or questions regarding the DPR 944 or other BSS products, and you may contact
us at the address or World Wide Web site given in the warranty section.
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Contents
Contents
1.0 Mechanical installation 5
2.0 Unpacking 6
3.0 Mains Power Connection 6
3.1 Mains Power 6
4.0 Introduction 7
5.0 Audio Connections 10
5.1 Main Inputs 10
5.2 Main Outputs 10
5.3 Key Insert 11
6.0 Control Operations - Gate 12
6.1 Gates In 12
6.2 Key filter 12
6.3 Filter narrow 12
6.4 Key listen 13
6.5 Threshold 13
6.6 Depth 20dB 14
6.7 Attack slow 14
6.8 Release 15
6.9 Stereo link 15
6.10 Open/Shut LEDs 16
6.11 Key insert connector 16
7.0 Genereal guide to gating 17
7.1 What are gates for? 17
7.2 Basic operation 18
8.0 Application examples - Gates 20
8.1 Basic gating 20
8.2 Frequency conscious gating 20
9.0 Control Operations - Parametric
compressor 22
9.1 Comps in 22
9.2 Threshold 22
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Contents
9.3 Ratio 23
9.4 Release fast 24
9.5 Gain 25
9.6 Side chain listen 25
9.7 Frequency 25
9.8 Width 26
9.9 Stereo link 26
9.10 Below threshold meter 27
9.11 Gain reduction meter 27
10.0 General guide to compressing 28
10.1 The need for gain control 28
10.2 Compressors & limiters 29
10.3 The effect of compression & limiting on
sound 30
10.4 Frequency selective compression 31
11.0 Application examples -
Compressors 32
11.1 Broadband (normal) compression 32
11.2 Peak limiting 32
11.3 De-essing, De-popping & reducing
proximity effect 33
11.4 Guitar treatment 35
11.5 Control of horn distortion 35
11.6 Dynamic bass and treble
enhancement 36
11.7 Using the side chain filter as EQ 36
11.8 Creative use 36
12.0 Warranty Information 37
13.0 Specifications 38
Index 40
User notes 41
Spare parts information
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Mechanical Installation
1.0 Mechanical installation
A vertical rack space of 1U (1 3/4"/44.5mm high) is required, with a depth of
190mm, excluding connectors. Ventilation gaps are unnecessary.
If the unit is likely to undergo extreme vibration through extensive road
trucking and touring, the unit must be supported 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 944 can be
mounted between other units. Damage caused by insufficient support is not
covered by the warranty. To prevent cosmetic damage to the front panel paint
finish, always use protective plastic cups under the rack mounting bolts.
As with any low-level signal processing electronics, it is best to avoid
mounting the DPR 944 next to a strong source of magnetic radiation or heat,
for example, a high power amplifier.
Fig 1.1 Unit dimensions.
Fig 1.2 Rack
dimensions.
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Unpacking
2.0 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 12.0; warranty section, for more info on the warranty, and
also to record your dealer details.
3.1 Mains Power WARNING! THIS APPLIANCE MUST BE EARTHED.
The DPR 944 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 944 is designed to use 50/60Hz AC power in one of
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.
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.
3.0 Mains Power Connection
Mains Power Connection
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Introduction
Note: For USA and Canadian users, the replacement fuse must be of an
identical UL rated type fuse for continued compliance with safety standards.
4.0 Introduction
The BSS Audio DPR 944 is a FOUR channel unit containing two channels of
ADVANCED GATING and two channels of PARAMETRIC COMPRESSION.
Both channels of the gate may be stereo linked, as can both channels of the
compressor. At all times the gate and compressor sections operate completely
independently. Each channel has separate balanced XLR input and output
connectors. As there are no obscure gate - compressor links to accidentally
activate during a live session, operating the unit is particularly
uncomplicated.
Gating
The gate section features the unique BSS characteristic audio level control
during both attack and release phases (refer to figures 7.3 - 7.5). This ensures
the most natural sounding operation, as the normal decay characteristic of the
signal is preserved. Special circuitry is provided to reduce the possibility of
false triggering and to ensure that it is possible to use a fast attack time
without running into the problem of ‘jittering’. The provision of fully
parametric key filtering and an external key input adds to the ease of use and
flexibility of the unit.
Parametric Compression
The compressor section uses the audibly transparent ‘subtractive VCA’
technology used in all other BSS compressors, and results in substantially
better performance than other methods. The subtractive VCA also allows the
realisation of a completely different type of compression that BSS have named
PARAMETRIC COMPRESSION. This allows you to selectively compress only
certain frequencies in a signal, as selected by two conventional looking
parametric filter controls on the front panel. When the selected frequencies
are encountered, the DPR 944 starts to compress only those signals at a rate
determined by the ratio and threshold controls. This is useful for controlling a
particularly strident vocalist or brass instrument for example. There are many
uses for this type of signal processing, and they are covered in section 11.0.
If desired, the parametric filter can be ‘dialled out’, in which case the DPR
944 compressors operate over the full frequency range.
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The DPR 944
Fig 4.2 Rear Panel
Fig 4.1 Front Panel
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All numbers in bubbles refer to Section numbers.
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5.0 Audio Connections
Audio Connections
5.1 Main Inputs There are 2 input sockets on the rear panel of the DPR 944, 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.
Fig 5.1
Fig 5.2
Fig 5.3
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.
When feeding the DPR 944 from unbalanced sources, connect the signal
conductor to pin 2 and the cable screen to pins 1 and 3.
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