BSS Audio DPR-901ii Manuale di istruzioni
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This Manual is the COPYRIGHT of BSS Audio. All reproduction and copying, other than for the legal
owner's personal use, or disclosure of part or whole to a third party, without prior written authorisa-
tion, is in violation of the European Copyright Convention. BSS Audio 1995
DPR-901ii
User's Manual
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DPR-901ii
Welcome to the DPR-901ii Users Manual
ABOVEANDBELOWTHRESHOLDDYNAMIC
PARAMETRIC EQUALISATION.
This manual is provided with the aim of assisting sound engineers,
producers,musicians,systeminstallersandconsultantstofullyunder-
stand the DPR-901ii, and to benefit from it’s maximum capability.
As opposed to most manuals, the contents can be read like a book. At
the same time, the information is structured under a series of broad
headings for easy access. So where possible within each section:
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!The most immediate information appears at the head of each
section under the main title.
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!As you read further into each subsequent section, more detailed,
specific information is given.
If you have any comments or questions about installing, setting-up or
using the DPR-901ii, please write to us about your application, at the
address in the warranty section.
DPR-901ii
Welcome
V1.1 9 August1995
This equipment has been tested and found to comply with the
following European Standards for Electromagnetic Compatibility.
Emission Specification EN55013 1990 (Associated equipment)
Immunity SpecificationEN50082/11992 (RF Immunity, Fast
Transients and ESD)
Mains Disturbance EN61000/3/21995
For continued compliance ensure that all input and output cables are
wired with cable screen connected to pin 1 of the XLR. The input XLR pin
1 on BSS equipment is generally connected to chassis via a capacitor to
prevent ground loops whilst ensuring good emc compatibility.
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Table Of Contents
Table Of Contents
1.0 Introduction 4
1.1 Features and Facilities 5
2.0 Installation 6
2.1 Unpacking 6
2.2 MechanicalInstallation 6
2.3 Mains Power 7
2.4 VoltageSetting 8
2.5 SafetyEarthing 8
2.6 AC Power Fusing 8
2.7 AudioConnections 9
2.8 GroundLoopControl 10
3.0 Controls 11
4.0 Principle of operation 16
5.0 Using the DPR-901ii 18
6.0 WarrantyInformation 20
Appendix A 21
A1 Chassis/0v Link Removal 21
A2 Input pin 1 to Chassis Connection 22
A3 TransientSuppressorReplacement 22
Appendix B 23
Technical Specifications 23
Appendix C 25
Glossary 25
User Notes 28
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DPR-901ii
1.0 Introduction
Introduction
Congratulations!.Whetheryou’reasoundengineer,producer,consult-
ant, installer or musician, you’ve just added a powerful new weapon to
youraudioarmoury.
The DPR-901ii is a new class of audio equaliser. Both subtle and power-
ful, it builds on the established problem solving capabilities of paramet-
ricequalisers.
It’suses range from processingand sweetening speech, instrumentsand
compositemusic, through SPL control,to loudspeaker system and room
tuning. The DPR-901ii refines the EQ process, makes it more specific -
and expands it too.
For the first time, changes in EQ and signal dynamics at the EQ’d fre-
quency can be created which are triggered either above or below the
individualthresholdlevelsinfouradjustable frequency bands. The
changes in tonality can range from the subtle and highly specific, up
to the extremes of instrument effects. Either way, the DPR-901ii’s unique
subtractiveprocesscoupledwithstate-variableequalisationensures
uncoloured, low distortion sound. Group delay in particular is low and
uniform, maintaining vital accuracy in the time/transient domain that is
lacking in the majority of conventional equalisers with ‘Bell’ response
envelopes.
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Features and Facilities
1.1 Features and
Facilities The DPR-901ii is a four band parametric equaliser which varies the
degree of equalisation dynamically, as the program level changes. The
processcan be thoughtof as frequencyselective compression and/or
expansion,butitisfundamentallydifferentto simple ‘frequency-con-
scious’ dynamics processing as used for noise gating, de-essing and the
like. It is also very different to the growing family of ‘sliding filter’ tech-
niquesused in single-ended noisereduction processors. A splitfacility
allows the unit to be used as two separate two band units, and a side
chain listen button allows monitoring of the filter setup.
Frequency selective compression is equivalent to applying CUT on a
normal equaliser while frequency selective expansion is like applying
BOOST. However, the DPR-901ii can be more subtle as the process is
dynamic: it will only occur above (or below) the threshold you have set.
Some possible uses for the DPR-901ii technology can be:
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!Toselectivelycompress and/or expand, broad or narrow-band seg-
mentsofprogram.
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!Tode-ess and de-pop.
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!To add dynamic loudness control (eg. bass boost at low SPLs).
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!To control SPL in a dynamic and frequency conscious manner.
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!Toenhanceor‘sweeten’mixedprogramme.
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!Toimprovevoice intelligibility (without risking howlroundorfeed-
back).
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!To enhance low level vocals.
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!To correct for and/or guard against, bad microphone technique (by
unskilled performers).
And in common with other units in BSS Audio’s processor range, the
DPR-901iifeatures:
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!Friendlyrotarycontrol knobs for all parameteradjustments.
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!Excellentlow level resolution to maintain subtle musical detail.
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!Minimum phase and low group delay for any EQ setting.
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!Highheadroom>+20dBu.
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!Conservativedrive capability into low impedances(down to 600
ohms)andlong, highly capacitive cables.
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!Automatic relay controlled signal bypass if mains power is discon-
nected or fails.
Altogether,the DPR-901ii willnot degrade a conventional high quality
analogue signal processing chain, even when two units are inserted in
line with the composite stereo mix.
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DPR-901ii
Installation
Unpacking
Mechanical Installation
As part of BSS AUDIO’s system of quality control, this product is
carefully checked before packing, to ensure flawless appearance.
After unpacking the unit, please inspect for any physical damage and
retain the shipping carton and all relevant packing materials for use
should the unit need returning.
A packet of spare fuses is supplied. Please keep them in a safe place.
If any damage has occurred, please notify your dealer immediately, so
that a written claim for damages can be initiated. See the Warranty
section of this manual.
A vertical rack space of 1U (1.75", 44.5mm) is required. Figure 2.1
details the relevant dimensions and fixing centres.
If the unit is part of a transportable system, you must support the unit at
it’s rear by additional bracing or shelving . Failure to do so will impair
reliability and invalidate the Warranty. Additional threaded M3 screw
holes are provided on the rear sides to assist in providing proper
support.
Adequateventilation must beprovided for by allowing sufficient room
around the sides and rear of the unit to allow free circulation of air.
Forcedcooling is notrequired.
2.0 Installation
2.1 Unpacking
Fig. 2.1 Mechanical
Dimensions
2.2 Mechanical
Installation
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Mains Power
The internal power supply regulators are mounted on the case sides
and use this as their heatsink. After a period of time in an enclosure,
the metal case will feel hot to the touch, but this is quite normal and
should not be a cause for alarm.
Before connecting your unit to its AC power source, check that the
voltage selector switch located on the rear panel is correctly set.
See figure 2.2.
WARNING:THIS APPLIANCE MUSTBE EARTHED.
IMPORTANT: The wires in this mains lead are colour coded in ac-
cordance with the following code:
Green and yellow......Earth
Blue......Neutral
Brown......Live
As the colours of the wires in the mains lead of this appliance may not
correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:
The wire which is coloured green and yellow must be connected to
the terminal in the plug which is marked with the letter 'E' or by the
earth symbol , or coloured green and yellow.
The wire which is coloured blue must be connected to the terminal
which is marked with the letter 'N' or coloured black.
The wire which is coloured brown must be connected to the terminal
which is marked with the letter 'L' or coloured red.
Those units that are supplied to the North American market will have an
integral moulded 3 pin connector which is provided to satisfy the area
safetystandards.
Fig. 2.2 Mains Voltage
Switch and Fuse
2.3 Mains Power
FOR CONTINUED PROTECTION AGAINST FIRE
REPLACE ONLY WITH THE SAME TYPE OF FUSE
SELECT VOLTAGE
AC 50/60Hz 40 WATTS MAINS POWER T250mA 230V
T315mA 115V
MAINS SUPPLY
ON DESIGNED & MANUFACTURED BY BSS AUDIO Ltd. ENGLAND
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DPR-901ii
Voltage Setting
SafetyEarthing
AC Power Fusing
2.4 Voltage Setting Themains voltage selector switchprovides a simple external adjustment
to allow operation on all international AC power standards. The allow-
able ranges for the supply voltage are:
96VAC up to 132VAC on the 115V position and
195VAC up to 264VAC on the 230V position.
An additional internal tap change is available for 100V working. Refer
to Appendix A.2. The tap change gives:
90VAC up to 110VAC on the 120V position
Outside these ranges the unit will not work satisfactorily, if at all.
Voltages in excess of the maximum will probably cause damage.
Voltages below the minimum will cause the power supplies to drop
out of regulation, degrading the performance of the system.
The Green and Yellow wire of the mains cord must always be con-
nected to an installation Safety Earth or Ground. The Earth is essential
for personal safety as well as the correct operation of the system, and
is internally connected to all exposed metal surfaces. Any rack frame-
work into which this unit may be mounted is assumed to be connected
to the same grounding circuit.
The incoming mains power is fused within the DPR901ii by the fuse
holder mounted on the rear panel. Should it be necessary, the fuse
must be replaced by one of the same size and current rating.
20mm T250mA for the 230V setting
20mm T315mA for the 115V setting
It is most important for continued safety that this specification is strictly
adhered to. Spare fuses of the correct rating are supplied with the unit
from new.
It is unlikely that the AC fuse will fail during normal use and caution
should be exercised if it does. The most likely reason at first power up
is the incorrect setting of the mains voltage switch on the rear panel.
Alternatively the unit may have been connected across two lines of a
three phase supply. In both of these cases the internal transient sup-
pressors may have been damaged and will continue to blow replace-
ment fuses, even if the supply is now correct. The suppressors will
have protected the DPR-901ii from damage and need replacing
before the unit can be used again.
Refer to Appendix A.1 for the replacement procedure.
2.5 Safety Earthing
2.6 AC Power
Fusing
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Audio Connections
2.7 Audio
Connections
Fig. 2.3 Input and
Output Connector
Wiring
TheDPR-901ii audio inputs areRFI filtered and electronicallybalanced,
withthe outputs electronically balancedandfloating. They are designed
to operate at any signal level up to +20dBu and will drive into loads of
600 ohms or greater. They will be ‘fuss free’, regardless of your installa-
tion’scomplexity. Figure 2.3 shows theconnectorwiring.
Whether your system is wired to a ‘pin 3 hot’ or a ‘pin 2 hot’ convention
will not matter as long as your wiring to both the input and output 3 pin
XLR connectors are the same . As is common with all other BSS equip-
ment of this type, we follow the convention of ‘screen goes forward with
the signal’. Input cable screening therefore needs to be derived from the
signal source end as pin 1 is ground lifted at low frequencies for the
inputs. If you wish to alter this please see appendix. You should use high
quality audio cable with 2 cores + screen for low noise and reliability,
andtosidesteppotential problems.
If the equipment driving the DPR-901ii has unbalanced outputs then
you will need to add a wire jumper such that the screen connection
on Pin 1 of the XLR is shorted to either Pin 2 or Pin 3, depending on
system convention.
If the equipment being connected to the DPR-901ii outputs have only
unbalanced inputs, then we recommend that you still use a balanced (ie.
2 core shielded) cable. You should connect the shield to pin 1, whilst the
cold connection should be used as the 0v reference and the hot connec-
tion for the live, on the unbalanced input. The cable screen should not
be connected through to the chassis/0v. Strict adherence to this will help
toeliminatepotential ground loop hums.
Unbalanced Wiring
Balanced Wiring
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DPR-901ii
Ground Loop Control
2.8 Ground Loop
Control Strict adherence to the wiring conventions noted above within a fully
balanced signal system will yield the best possible results with none of
theproblemsnormallyassociatedwithinterconnectedaudioequipment.
Wherever possible, cable screens should not be connected to any signal
pin, but rather left to perform a cable shielding function only.
Where it is not possible to control all of the external cabling, it might
become necessary to have the internal electronic ground of your unit
separated from the case safety ground. Provision is made internally
within the DPR-901ii to separate these two grounds at a convenient
point, or to add a suitable impedance network as part of a house system
requirement.Pleaseseeappendix.
Under no circumstances should the safety ground wire be removed from
the mains AC power connector as an interim measure to achieve similar
results.
Indice
Altri manuali BSS Audio Equalizzatore stereo
