XTA DP548 Users Manual

1.10

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DP548 Operator’s Manual

DP548 DP548

DP548

DP548 Quick Reference

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Editing channels : press channel’s GAIN key. First press accesses
that channel’s gain. To scroll through channel’s parameters, use the
BACK and NEXT keys. Second press accesses last viewed parameter.
Third press will drop back to the default screen.

Accessing menus: press the MENU key. Use the BACK and NEXT
keys to select the sub-menu required, and enter the sub-menu using the
ENTER key. This applies to all levels of menu. ENTER always
confirms selections.

The Menus and their Contents

GLOBAL MEMORY

GLOBAL MEMORY Sub-menu: Recall/Store/Erase input, graphic

GLOBAL MEMORY GLOBAL MEMORY

EQ, dynamic EQ, and crossover settings, or combinations of these.

INPUT SECTION

INPUT SECTION Sub-menu: Set up input ganging, and GEQ ‘Q’

INPUT SECTIONINPUT SECTION

setting.

CROSSOVER

CROSSOVER Sub-menu: Set up or adjust crossover design, including

CROSSOVERCROSSOVER

routing and auto limiter setting. Also set up output ganging.

INTERFACE

INTERFACE Sub-menu: Comms interface setup (RS232 and RS485),

INTERFACEINTERFACE

G.P.I. interface configuration, and wireless interface.

SYSTEM

SYSTEM Sub-menu: Used to view unit’s status, and select various

SYSTEMSYSTEM

global options such as PEQ ‘Q’ or bandwidth units, delay units, and
output metering point (pre/post mute).

SECURITY

SECURITY Sub-menu: Used for locking various operations of the

SECURITYSECURITY

unit, using a 4 digit code.

AES/EBU

AES/EBU Sub-menu: Switch outputs from analogue to digital and

AES/EBUAES/EBU

monitor AES input status info. (AES inputs are switched via rear panel.)

DYNAMIC

DYNAMIC Sub-menu: Change how gain reduction meters behave.

DYNAMICDYNAMIC

Notes

The output meters show level, in dB from the limiter threshold, and the
input meters show level from clipping the A-D converters,
pre-gain and all EQ.

When editing DEQ or compressors, meters read downwards and show
gain reduction for each DEQ section or compressor respectively.

The high and low pass crossover filters are defined independently on
each output channel.

To access the limiter attack and release parameters, select
“AutoLimiter TimeCst: No” when designing a crossover.

To swap parametric filter units between bandwidth (‘BandW’) and ‘Q’,
enter System

System Sub-menu, select ‘Filter Q / Bandwidth’, and select

SystemSystem

required readout units.

To swap delay time units, enter System
Time / Distance’, and select required readout units.

Pressing an EDIT key flashes corresponding channels routed to / from
that channel.

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System Sub-menu, select ‘Delay

SystemSystem

Contents

Important Safety Information 6
Thanks 7
Unpacking the unit 7
Introduction 8

Features 8

Front Panel Familiarisation 9
Rear Panel Connections 10

Operating the DP548

Note about operation with AudioCore software. 11
Start-up procedure 11
Preliminary Set-up as a Crossover 11

Input Channel Makeup 12
Output Channel Makeup 12

Preset Routing Configurations 12
Free Assign Routing 15
Full Matrix Mixing 15

Editing Audio Parameters – Input Channels 16

Input Gain 16
Base Delay 16
Input Graphic EQ 16
Input Parametric EQ 16

Editing Audio Parameters – Output Channels 18

Output Gain 18
Output Polarity 18
Output Delay 18
Output High Pass Filter 19
Output Low Pass Filter 19
Output Parametric EQ 19
Output Compressor 20
Output Limiter 21
Output “D-Max” (Clip) Limiter 21
Input Ganging and Output Ganging 22

Menus in Detail 24

Memory Structure 26

Remote Control Interface Operation 28

RS232 Interface 28

RS232 Connection (Single Unit) 28
Loading New Software via a PC 29
RS232 Connection (Multiple Units) 29
Shadow ID Numbers 30
RS485 Connection 31

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AES Inputs and Outputs 33

AES Input 33
AES Output 33

AES Diagnostics and Status Information 34

Security and Locking 35

Entering the Password to Complete the Locking Operation 35
Unlocking the Unit 36
Forgotten the Password? 36

PCMCIA Card and Compact Flash Card Usage 37

Preset Library Updates via the card 37
Unit Software Updates via the card 37
Unit Cloning 38
Copying Unit Software and Preset Files 38

Copying Data from Source Unit 38
Loading Data into Destination Unit 38
Cold Start Reboot Procedure 38

Advanced Audio Features 39

Graphic Equaliser Behaviour 39

The “GQ600” behaviour 39
The “Special” behaviour 40

What is Dynamic EQ? 41

Quadrant/Mode I: “Boost Above” 41
Uses of “Boost Above” mode. 41
Uses of “Cut Above” mode. 42
Uses of “Cut Below” mode. 43
Uses of “Boost Below” mode. 44

Dynamic EQ operating modes 45

Parallel Mode 45
Serial Mode 45

Setting the Attack and Release times 46
The Compressor ‘Knee’ Control 47
Program Limiter and “D-Max” Limiter 48

Program Limiter 48
“D-Max” Clip Limiter 49

Setting Accurate Limiter Thresholds 51
Crossover Filter Slopes 52
Time Alignment 52
Parametric Filter Types and Their Uses 53

Standard Parametric EQ 53
Shelving EQ (High Shelf shown) 54
Creating a Flat-topped EQ Response 54
Notch Filter 55
All Pass Filter 56
Phase Filter 56
Low/High Pass Variable ‘Q’ Filter (Low Pass shown) 57
Elliptical filters 58

Specifications 59
Warranty 60
Options and Accessories 60
Index 61

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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): EN55013-1 (1996)
RF Immunity (EU): EN55103-2 (1996) RF Immunity, ESD, Burst Transient, Surge, Dips &Dwells
Electrical Safety (EU): EN60065 (1993)

Important Safety Information

Do not remove Covers.
No user serviceable parts inside, refer servicing to qualified service personnel.
This equipment must be earthed.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

DO NOT EXPOSE TO RAIN, MOISTURE,

DRIPPING OR SPLASHING

ATTENTION

RISQUE DE CHOC ELECTRIQUE

NE PAS ENLEVER

NE PAS EXPOSER A LA PLUIE NI A L’HUMITE

Objects containing liquids, such as vases, must not be placed on this equipment.

It should not be necessary to remove any protective earth or signal cable shield connections.

Do not defeat the 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 wider blade and the third prong are
provided for your safety. When the provided plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.

Only use this equipment with an appropriate mains cord.

In the USA the cord should comply with the requirements contained in the Standard for Cord Sets and Power Supply
Cords, UL 817, be marked VW-1, and have an ampacity rating not less than the marked rating of the apparatus.

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Thanks

Thank you for choosing an XTA DP548 for your application. Please spend a little time reading through this manual, so
that you obtain the best possible performance from the unit.
All XTA products are carefully designed and engineered for cutting-edge performance and world-class reliability. If you
would like further information about this or any other XTA product, please contact us.
We look forward to hearing from you in the near future.

Unpacking the unit

After unpacking the unit, please check it carefully for any damage. If any is found, immediately notify the carrier
concerned - you, the consignee, must instigate any claim. Please retain all packaging in case of future re-shipment.

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Please think of our environment and don’t bin any materials, including this manual. When the product
has reached the end of its useful life, please dispose of it responsibly through a recycling centre.

Operator’s Manual Page 7

Introduction

The DP548 is a powerful DSP based audio processor, where it combines the functions of a multitude of conventional
products in a compact 1U unit with extensive remote control capabilities. To achieve this, the unit has four inputs and
eight outputs which can be configured in a selection of basic crossover modes – 4 x 2 way; 2 x 3 way + 2 Aux; 2 x 4 way;
and 1 x 8 way (as applicable to i/o configurations). They also offer a “free assign” mode, which allows completely flexible
routing of any output from any combination of inputs and a “matrix” mode which allows mixing of any input to output (as
opposed to switching with fixed gain).

Each input has a gain control, variable delay, a 28 band graphic equaliser and a further eight bands of fully parametric
equalisation. The parametric filter bands have a large selection of different filter types available, including shelving, notch,
band-pass, phase and elliptical behaviours. Three bands of dynamic EQ are also included on each input which adapts its
behaviour depending of the proximity of the level to a user defined threshold.

Each output has a gain control, variable delay, high and low pass crossover filters, nine bands of fully parametric
equalisation, polarity switching, a fully featured compressor with variable knee, a flexible limiter, and a final clip limiter.
The crossover filters offer slopes of up to 48dB/Octave., with a variety of responses available.

Remote control1 is catered for in the form of RS232 and RS485 ports, and multiple user memories are provided for the
storage and recall of settings. A GPI interface may also be fitted to allow remote memory recalls using simple switch
closure apparatus.

Security lock-out is available for all controls.

The DP548 is also equipped with AES/EBU digital inputs and outputs, and include a sample rate converter, capable of
accepting anything from 32kHz up to 192kHz.

Units may be controlled externally by XTA’s proprietary Windows
future ‘AudioCore’ products.

Features

Superb audio quality – carefully optimised double precision signal processing coupled with 24 bit conversion ensure a
dynamic range in excess of 117dB. The high sampling rate of 96kHz means minimal filtering providing exceptional sonic
purity with a bandwidth in excess of 32kHz.

A flexible input/output multi-mode format caters for any configuration, regardless of scale. Both routing of inputs to
outputs, and ganging (for editing) are completely flexible.

A completely new SHARC
not only multiple bands of standard parametric equalisation on every input and output, but also a full spectrum graphic
equaliser on each of the four inputs. Three bands of dynamic EQ are available on each input, along with a fully featured
soft-knee compressor, program limiter and look-ahead clip limiter on each output.

Delay of up to 650mS may be independently set for each output, with an exceptionally fine minimum increment of 300nS,
which corresponds to a distance change of 0.1mm!

The comprehensive standard specification also includes up to 255 memories, and remote control via RS232 or RS485
ports, with security lockout.

XTA’s new proprietary Complex Unified Nyquist Truncation algorithm ensures that no matter how much equalisation is applied to a channel, there will always be sufficient
headroom available to cater for it.

TM

based DSP platform supplies phenomenal computational power, allowing the unit to provide

TM

software, along with existing and

1

Note that only the RS232 and RS485 interfaces offer full remote control of this product – the GPI interface may only be

used for memory recall (program change) purposes.

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Front Panel Familiarisation

LCD Screen: Shows, by default, the name of

the last recalled memory on the bottom line of
the screen, and the current routing on the top
line. Also used to show all parameters as they
are edited, and all menu selections.

Control Keys: Selection and adjustment of parameters.
NEXT key moves forward through list of parameters.
BACK key moves backwards through list of parameters.
MENU key activates the main menu – a second press selects the last menu edited – a third press selects
the last menu item. In this way, three presses on MENU from the default screen will jump back to the
last parameter adjusted. Selection of different menus is accomplished using the BACK and NEXT keys,
or with the FREQ encoder.
ENTER key enters the chosen menu, confirms selections, and changes filter types when editing

parametric sections.
BYPASS will flatten the currently selected parametric sections, or input graphic equalisers and
dynamics modules. For safety reasons, it is not possible to bypass the high and low pass filter sections.
QUIT exits menus back to the default screen.

Rotary Encoders: Three velocity sensitive encoders adjust the relevant parameters as
displayed on the screen.
Memory Card Slot: Will accept type I or type II PCMCIA SRAM cards and, using an
adapter, Compact Flash cards. This allows the unit to be cloned, memory sets saved,
presets loaded, and firmware updates installed.
Status LEDs: The four status LEDs show, from left to right, AES inputs selected
(flashing if not locked); AES outputs selected; Comms activity (only illuminates on
messages addressed to this particular unit); and a general-purpose spare indicator.

Input Sections: Control and monitor input signal paths.
Red MUTE buttons illuminate when pressed and mute audio for that channel.
EDIT buttons illuminate yellow when pressed, and access gain on first press, then last viewed parameter
on second press, then exit on third press.
Input meters show dB from clipping point of the analogue to digital converters. Yellow (0dB) LED
illuminates 3dB from clipping. Red CLIP LED may illuminate independently from the rest of the meter
to show digital overflow. All four CLIP LEDs illuminating indicates internal clipping after the ADC.

Meters also read downwards from the yellow LED to show gain adjustment (reduction or expansion)
when editing DEQ modules – meter shows gain adjustment for current band of DEQ only.

Output Sections: Control and monitor output signal paths.
Red MUTE buttons illuminate when pressed and mute audio for that channel.
EDIT buttons illuminate yellow when pressed, and access gain on first press, then last
viewed parameter on second press, then exit on third press. Output meters show dB from
limiting. The yellow LED illuminates at the onset of limiting. The red LED illuminates at
4dB into limiting (i.e. 4dB of gain reduction).
Meters also read downwards from the yellow LED to show gain reduction when editing
compressors. These may be left permanently enabled by changing this option in the

DYNAMICS

DYNAMICS sub-menu.

DYNAMICSDYNAMICS

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Rear Panel Connections

Power Switch: turns the unit’s mains supply off and on.
Mains Fuse: located in a finger-proof holder adjacent to the mains inlet. A spare fuse

is also located in this holder.

Mains Inlet: connected via a standard IEC socket.

RS232: RS232 standard via a 9 pin D-type connector, for connection to a PC. Data is

converted to RS485 standard and relayed to slave units via the RS485 sockets.
RS485 In-Out: XLR sockets. Used for transmission of remote control data over long
distance or multiple unit applications. See page 30 for more information.

For more details on interfaces see our Interface Guide, available from the website.

Audio Outputs: 3 pin XLR sockets are provided for each channel. All are fully balanced, pin 2 hot, 3 cold, 1 screen.
Note the legending on the panel to designate which outputs are used for AES streams when the digital outputs are
enabled. Please see page 33 for more information.

Always replace the fuse with the correct type and rating as shown on the rear panel legend.

AES Input Switch: Recessed switch to select AES digital
inputs. Red LED will illuminate in the hole when AES inputs
are selected, along with the corresponding front panel
indicator.
Audio Inputs: 3 pin XLR sockets are provided for each
channel. All are fully balanced, pin 2 hot, 3 cold, 1 screen.

Note the legending on the panel to designate which inputs
are used for AES when the digital inputs are enabled. Please
see page 33 for more information.

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Operating the DP548

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DP548DP548

Note about operation with AudioCore software.

The following operating information covers setup and control of the DP548 via the front panel controls only. Please
consult the manual supplied with this software for information regarding full computer control.

Start-up procedure

Switching on the unit will display a brief message detailing the unit type and software version running

== Audio

== AudioCore DP548 ==

== Audio== Audio

==Software V 1.00 ==

==Software V 1.00 ==

==Software V 1.00 ====Software V 1.00 ==

Core DP548 ==

Core DP548 ==Core DP548 ==

and all LEDs will briefly illuminate. The unit will then begin its countdown to the wake-up procedure2, during which time
the audio will fade up to the level last set. Metering will begin to operate when the fade-up starts.

Preliminary Set-up as a Crossover

The procedure below should be followed when first installing a DP548

 Design your crossover! To do this, press MENU, and use the BACK or NEXT key to select ‘Crossover

sub

sub----menu

menu’ and then press ENTER. Use the BACK or NEXT key to select ‘Design a crossove

subsub

menumenu

and then press ENTER. Finally, use the BACK or NEXT key to select the desired routing3and follow the set-up
wizard to finalise your design.

 Note that when in a menu, ENTER is always used to confirm selections. The current selection is marked with an

asterisk ‘*’.

 Use the EDIT keys on each output channel with the BACK and NEXT keys to select the high pass filters, low

pass filters, parametrics etc. Note that when designing a new crossover, the high and low pass filters will be set
to default values.

 Use the EDIT keys on each input channel with the BACK and NEXT keys to select the gain, delay and

parametrics available on each input.

Note that if no action is taken in menu mode, the unit will return to normal ‘default’ mode after about twenty
(20) seconds. Repeat the above directions to return to menu mode.

DP548.

DP548DP548

Crossover

Crossover Crossover

Design a crossoverrrr’

Design a crossoveDesign a crossove

2

The wake-up time countdown may be adjusted in the SYSTEM menu – see page 24 for details.

3

For details about adjusting the routing if one of the standard configurations does not suit, see page 15.

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Operator’s Manual Page 11

Routing Options and Processing Blocks

Due to the completely new DSP platform, the routing possibilities within the DP548 have been made completely flexible,
with a matrix available allowing any combination of inputs to be routed to any output. The additional DSP power has
permitted the inclusion of more processing blocks, even considering the extra inputs and outputs, and the doubling of
sample rate.

To reduce set-up time and aid usability, several standard configurations are available as described in a later section.

This section will outline the processing blocks available in relation to the signal path, and explain the various options for
routing, including the “Free Assign” mode, which opens up completely flexible channel routing, and “Matrix” mode which
also adds gain controls for mixing capabilities.

Input Channel Makeup

The diagram below shows the processing available on each of the four input channels, before routing to the matrix.

Output Channel Makeup

The diagram below shows the processing available on each of the eight output channels, after routing from the
matrix/mixer.

Preset Routing Configurations

In addition to the ability to assign any combination of inputs to any output, a number of preset configurations are provided,
for use when designing a crossover from scratch. These have the advantage of suggested settings for the high and low pass
filters to useful basic starting points, to filter the different outputs as appropriate for the chosen configuration. These may,
of course, be freely modified afterwards should they not suit the requirements exactly.

The diagrams on the following pages show the connections made between inputs and outputs, and the suggested values
chosen for the high and low pass filters.

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4 x 2 way crossover: As shown, each input feeds a pair of outputs, odd numbers being the low frequency split, and even
numbers being the high part of the spectrum. Default suggested crossover frequencies are shown by each output.

2 x 3 way crossover: Inputs A and B feed three outputs each, with output 7 being fed from input C, and output 8 from
input D. Note the ‘Aux’ outputs are set to full range. Default suggested crossover frequencies are shown by each output.

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2 x 4 way crossover: Inputs A and B feed four outputs each, with inputs C & D being unused. Default suggested crossover
frequencies are shown by each output.

1 x 8 way crossover: Inputs A is fed to all eight outputs, with initial settings being all full bandwidth. The crossover points
can be adjusted as desired.

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Free Assign Routing

If none of the preset configurations are appropriate to the required system setup, it is possible to manually select the
routing of the crossover. This is achieved through the Crossover Menu

Pressing ENTER will start the crossover design wizard, with the first option being to choose the routing.

The display will show

Design A Crossover

Design A Crossover ---->>>>

Design A Crossover Design A Crossover

Routing = 2 X 4 WAY *

Routing = 2 X 4 WAY *

Routing = 2 X 4 WAY *Routing = 2 X 4 WAY *

or whatever the current configuration is set to. Press BACK until the display shows

Design A Crossover

Design A Crossover ---->>>>

Design A Crossover Design A Crossover

Routing = Free Assign

Routing = Free Assign

Routing = Free AssignRouting = Free Assign

And then press ENTER. The EDIT key will illuminate for output 1, as will any relevant input EDIT keys, showing which
inputs are feeding output 1. The display will also detail the current combination of inputs feeding this output. To change
the routing for any output, press its EDIT key, and then choose the required input channel combination by just pressing
the input EDIT keys as appropriate. The input combinations can also be stepped through in turn by pressing NEXT, or
BACK.

To complete the procedure, press ENTER. The wizard will continue, and if the routing has been changed, all outputs will
be muted on exit.

Crossover Menu ----> Design A Crossover

Crossover Menu Crossover Menu

> Design A Crossover.

> Design A Crossover> Design A Crossover

Full Matrix Mixing

If the free assign mode still isn’t flexible enough (!), it is possible to manually select the routing of the crossover with full
level mixing from any input to output. This is achieved through the

Crossover Menu

Crossover Menu ----> Design A Crossover

Crossover Menu Crossover Menu

Pressing ENTER will start the crossover design wizard, with the first option being to choose the current routing.

The display will show

Design A Crossover

Design A Crossover ---->>>>

Design A Crossover Design A Crossover

Routing = 2 X 4 WAY *

Routing = 2 X 4 WAY *

Routing = 2 X 4 WAY *Routing = 2 X 4 WAY *

or whatever the current configuration is set to. Press BACK until the display shows

Desi

Design A Crossover

gn A Crossover ---->>>>

DesiDesi

gn A Crossover gn A Crossover

Routing = Full Matrix

Routing = Full Matrix

Routing = Full MatrixRouting = Full Matrix

To complete the procedure, press ENTER. The wizard will continue, and if the routing has been changed, all outputs will
be muted on exit.

Matrix routing levels are stored in crossover memories (as with routing settings).

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Operator’s Manual Page 15

> Design A Crossover

> Design A Crossover> Design A Crossover

Editing Audio Parameters – Input Channels

Input Gain

The range of the control over the input gain is –40dB to +6dB in 0.1dB steps.

InA Input A Gain

InA Input A Gain

InA Input A GainInA Input A Gain

Input Gain = +6.0dB

Input Gain = +6.0dB

Input Gain = +6.0dBInput Gain = +6.0dB

Gain

Base Delay

The maximum available delay between any input and output is 650.00mS. For example, if the input delay on channel A is
set to 500mS, the maximum available output delay for any output fed from input A will be 150mS. The readout units can
be changed between time in milliseconds, distance in feet or distance in metres. Please see page 24 for more details.

InA Input A Delay

InA Input A Delay

InA Input A DelayInA Input A Delay

Base Delay = 0.00mS

Base Delay = 0.00mS

Base Delay = 0.00mSBase Delay = 0.00mS

x 1mS x 10uS

343mm 4mm

Note that Base Delay (Input Delay) is not available when in “Full Matrix” mode.

Input Graphic EQ

The graphic equaliser has 28 third octave bands from 31Hz to 16kHz, and a gain range of +12dB. The G6
line of the screen denotes the ‘Q’ behaviour of the graphic – this setting behaves like a GQ600 with variable ‘Q’ that is

‘gentler’ at low cut/boost values and sharpens at high cut/boost values. The alternate setting, Sp
behaviour where no change in bandwidth occurs with differing cut/boost. Pressing BYPASS
Graphic EQ on this channel. For details of how to select the behaviour, please see page 24.

InA Input A Graph<>

InA Input A Graph<>

InA Input A Graph<>InA Input A Graph<>

40Hz +

40Hz +-----

40Hz +40Hz +

----- G6 0.0dB

G6 0.0dB

----------

G6 0.0dB G6 0.0dB

BYPASS will bypass the entire

BYPASSBYPASS

Sp, is a constant ‘Q’

SpSp

G6 on the second

G6G6

Frequency Gain

Input Parametric EQ

There are eight bands of parameter equalisation available on every input. The behaviour of each individual band can be
changed to a variety of different filter shapes, including high and low shelves, notch, and bandpass. Changing the filter type
is achieved by pressing ENTER
available, please see page 51.

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ENTER during editing any particular band. For more details about the various types of filter

ENTER ENTER

InA Input A PEQ:1<>

InA Input A PEQ:1<>

InA Input A PEQ:1<>InA Input A PEQ:1<>

1k00Hz Q=3.0 0.0dB

1k00Hz Q=3.0 0.0dB

1k00Hz Q=3.0 0.0dB1k00Hz Q=3.0 0.0dB

Frequency ‘Q’ Gain

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Input Dynamic EQ

There are 3 bands of dynamic EQ available on each input. Each band has three screens associated with it. For more
information on how the dynamic EQ works, please see page 41. The first edit screen shows the threshold for the band,
and the ratio for the dynamic action, along with the mode. The gain reduction meter to the left on the bottom line of the
display shows gain reduction (or expansion) in 0.5dB steps. The band can by bypassed by pressing the BYPASS
whereupon the meter will be replaced by BYPASS

BYPASS.

BYPASSBYPASS

InA Input A

InA Input A DEQ:1+^

InA Input A InA Input A

|||||||||| Th=

|||||||||| Th=----32.0 Rat=2.00

|||||||||| Th=|||||||||| Th=

32.0 Rat=2.00

32.0 Rat=2.0032.0 Rat=2.00

DEQ:1+^

DEQ:1+^ DEQ:1+^

BYPASS key

BYPASSBYPASS

Threshold Ratio

Threshold Ratio

Threshold RatioThreshold Ratio

Mode is indicated at the right hand side of the top line like this “DEQ:1+↑”. In this case it represents “Boost Above”
mode. The plus or minus shows boost or cut and the arrow shows above or below the threshold (↓). Mode is changed
by setting the ratio to 1:1 and then pressing ENTER

Pressing NEXT

NEXT shows the attack and release times. Note that release time cannot be set to faster than the attack time

NEXTNEXT

and will be forced to track it if you increase the attack to a greater value than the release. This is to prevent introducing
distortion that can be caused due to the detector tracking individual cycles of the waveform, rather than its envelope. For
more information about this, see the section about the compressors on page NN.

Pressing NEXT

NEXT shows the filter parameters for the band. Note that gain value shown is the maximum (or minimum)

NEXTNEXT

allowable amount of gain change that may be applied – so even if the signal is far over the threshold with a high ratio, the
gain of the band won’t change by more than this value.

ENTER to scroll through the modes.

ENTERENTER

InA Input A DEQ:1+^

InA Input A DEQ:1+^

InA Input A DEQ:1+^InA Input A DEQ:1+^

At=0.07mS Rl=11mS

At=0.07mS Rl=11mS

At=0.07mS Rl=11mS At=0.07mS Rl=11mS

Attack Release

Attack Release

Attack Release Attack Release

InA Input A DEQ:1+^

InA Input A DEQ:1+^

InA Input A DEQ:1+^InA Input A DEQ:1+^

99.2Hz 1.0 12dB

99.2Hz 1.0 12dB

99.2Hz 1.0 12dB99.2Hz 1.0 12dB

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Frequency ‘Q’ Max. Gain

Frequency ‘Q’ Frequency ‘Q’

Operator’s Manual Page 17

Max. Gain

Max. Gain Max. Gain

Frequency ‘Q’

Editing Audio Parameters – Output Channels

Output Gain

The range of the control over the input gain is –40dB to +15dB in 0.1dB steps.

OP1 Output 1 Gain

OP1 Output 1 Gain

OP1 Output 1 GainOP1 Output 1 Gain

Output Gain = +6.0dB

Output Gain = +6.0dB

Output Gain = +6.0dBOutput Gain = +6.0dB

Gain

Output Polarity

The polarity (or phase) of each output may be switched individually as below.

OP1 Output 1 Polar.

OP1 Output 1 Polar.

OP1 Output 1 Polar.OP1 Output 1 Polar.

Polarity = [+]

Polarity = [+]

Polarity = [+]Polarity = [+]

- or +

Output Delay

The maximum available delay between any input and output is 650.00mS. For example, if the input delay on channel A is
set to 500mS, the maximum available output delay for any output fed from input A will be 150mS. The readout units can
be changed between time in milliseconds, distance in feet or distance in metres. Please see page 24 for more details.

OP1 Output 1 Delay

OP1 Output 1 Delay

OP1 Output 1 DelayOP1 Output 1 Delay

Delay = 0.0000mS

Delay = 0.0000mS

Delay = 0.0000mSDelay = 0.0000mS

x 1mS x 10uS x0.3uS

343mm 4mm 0.1mm

Page 18 DP548

DP548 Operator’s Manual

DP548 DP548

Output High Pass Filter

The high pass crossover filter on each output has a frequency range of <10Hz up to 32kHz in 1/36th Octave steps. If you
try to set the high pass filter to a higher frequency than the low pass (which would be pointless and result in no output),
the message High/Low Freq. Overlap!
parametric bands 6 & 7 need to be bypassed, or set to 0dB. If they are not, the message Bypass PEQ’s 6 &

7 To Access 48dB Slopes

7 To Access 48dB Slopes will be displayed.

7 To Access 48dB Slopes 7 To Access 48dB Slopes

High/Low Freq. Overlap! will be displayed. Note that to access the 48dB/Octave filters,

High/Low Freq. Overlap!High/Low Freq. Overlap!

Bypass PEQ’s 6 &

Bypass PEQ’s 6 & Bypass PEQ’s 6 &

OP1 Output 1 HPF /~~

OP1 Output 1 HPF /~~

OP1 Output 1 HPF /~~OP1 Output 1 HPF /~~

<10Hz Linkw

<10Hz Linkw----Riley 48dB

<10Hz Linkw<10Hz Linkw

Riley 48dB

Riley 48dBRiley 48dB

Frequency Slope

Output Low Pass Filter

The low pass crossover filter on each output has a frequency range of 35.1Hz up to >32kHz in 1/36th Octave steps. If you
try to set the low pass filter to a lower frequency than the high pass (which would be pointless and result in no output), the
message High/Low Freq. Overlap!
parametric bands 8 & 9 need to be bypassed, or set to 0dB. If they are not, the message Bypass PEQ’s 8 &

9 To Access 48dB Slopes

9 To Access 48dB Slopes will be displayed.

9 To Access 48dB Slopes9 To Access 48dB Slopes

High/Low Freq. Overlap! will be displayed. Note that to access the 48dB/Octave filters,

High/Low Freq. Overlap!High/Low Freq. Overlap!

Bypass PEQ’s 8 &

Bypass PEQ’s 8 & Bypass PEQ’s 8 &

OP1 Output 1 LPF ~~

OP1 Output 1 LPF ~~\\\\

OP1 Output 1 LPF ~~OP1 Output 1 LPF ~~

>32kHz Linkw

>32kHz Linkw----Ril

>32kHz Linkw>32kHz Linkw

Riley 48dB

ey 48dB

RilRil

ey 48dBey 48dB

Frequency Slope

Output Parametric EQ

There are nine bands of parametric equalisation available on every output4. The behaviour of each individual band can be
changed to a variety of different filter shapes, including high and low shelves, notch, and bandpass. Changing the filter type
is achieved by pressing BYPASS
more details about the various types of filter available, please see page 51.

BYPASS to bypass the filter and then pressing ENTER

BYPASSBYPASS

OP1 Output 1 PEQ:1<>

OP1 Output 1 PEQ:1<>

OP1 Output 1 PEQ:1<>OP1 Output 1 PEQ:1<>

1k00Hz Q=3.0 0.0dB

1k00Hz Q=3.0 0.0dB

1k00Hz Q=3.0 0.0dB1k00Hz Q=3.0 0.0dB

ENTER during editing any particular band. For

ENTER ENTER

Frequency ‘Q’ Gain

4

Note that 2 bands each will be lost when using 48dB slope crossover filters, resulting in a maximum of 5 bands of EQ

when both high and low pass are set to 48dB/Octave.

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Operator’s Manual Page 19