APG DMS48 User manual

User Manual
Digital Processor
DMS48

CONTENTS CONTENTS
V 1.1
Contents
1 Important safety instructions 5
2 Thanks and Unpacking 7
2.1 Unpacking the APG DMS48 . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Introduction and Key Features 8
3.1 Introduction .................................... 8
3.2 KeyFeatures.................................... 8
3.3 DriveModules................................... 9
3.4 LIR Linear Phase Crossover Filtering . . . . . . . . . . . . . . . . . . . . . . . 9
3.5 FIR Linear Phase Equalisation . . . . . . . . . . . . . . . . . . . . . . . . . . 9
User Guide 11
A Menu Buttons 11
A.1 FrontPanel .................................... 11
A.1.1 Page Selection Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . 11
A.1.2 Input Signal Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 11
A.1.3 Input Clip/mute Indicator . . . . . . . . . . . . . . . . . . . . . . . . . 12
A.1.4 GraphicalDisplay ............................. 12
A.1.5 StatusIndicators ............................. 12
A.1.6 Parameter Encoders . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
A.1.7 AES3 Active Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 12
A.1.8 MuteButtons ............................... 12
A.1.9 LimiterIndicators ............................. 13
A.1.10 Selection Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.2 Rearpanel..................................... 13
A.2.1 Ethernet Communications Port . . . . . . . . . . . . . . . . . . . . . . 13
A.2.2 Networked Audio Ports . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.2.3 Audio Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . 14
A.2.4 Audio Input Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 14
A.2.5 PowerInlet ................................ 14
A.2.6 AuxiliaryPort ............................... 14
B Operation 14
B.1 Startinguptheunit................................ 14
B.2 DriveModulePresets ............................... 15
B.3 Navigation and Parameters Edition . . . . . . . . . . . . . . . . . . . . . . . . 15
B.4 FactoryPresets .................................. 16
B.5 StoringPresets .................................. 17
B.6 RecallingPresets.................................. 17
User Manual DMS48 V1.1 3

CONTENTS CONTENTS
C Input 17
C.1 AES3/NetworkInputs.............................. 17
C.2 GainandPolarity ................................. 18
C.3 Delay........................................ 18
C.4 HighPassFilter .................................. 18
C.5 Parametric Equalisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
C.6 FIRShelvingEQ.................................. 19
C.7 ParametricFilters ................................. 19
C.8 Routing ...................................... 19
D Output 20
D.1 AES3outputs ................................... 20
D.2 GainandPolarity ................................. 20
D.3 Delay........................................ 20
D.4 High and Low pass Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
D.5 LIR Crossover Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
D.6 Parametric Equalisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
D.7 Limiters ...................................... 21
D.7.1 VxLimiter................................. 21
D.7.2 Tmax Thermal Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . 22
D.7.3 Xmax Excursion Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . 22
D.7.4 AmplifierGain............................... 22
D.8 Routing ...................................... 22
E Utility Pages 22
E.1 ScreenContrast .................................. 22
E.2 StereoLinking................................... 22
E.3 Current Ethernet IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
E.4 IPMode...................................... 23
E.5 IPStatic...................................... 23
E.6 StoreSnapshot .................................. 23
E.7 RecallSnapshot .................................. 23
E.8 BandwidthUnits.................................. 23
E.9 Latencydisplay .................................. 23
F Ethernet 24
F.1 Ethernet configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
F.2 DHCP ....................................... 24
F.3 AUTO-IP ..................................... 24
F.4 Static-IP...................................... 24
F.5 IPTroubleshooting ................................ 24
G Snapshots 24
G.1 AUXPort ..................................... 25
H Latency Delays 25
H.1 AudioNetworkoutputs .............................. 26
H.2 SecureMode.................................... 26
User Manual DMS48 V1.1 4

1 IMPORTANT SAFETY INSTRUCTIONS
I Technical Specifications 27
I.1 Connectors..................................... 27
I.2 Environmental................................... 27
I.3 Dimensions..................................... 27
I.4 Options ...................................... 27
I.5 DMS48Synopticview............................... 29
1 Important safety instructions
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS
RISQUE DE CHOC
ELECTRIQUE
NE PAS OUVRIR
DO NOT EXPOSE TO RAIN OR MOISTURE
Caution: Risk of electric shock do not open !
Caution: In order to reduce the risk of electric shock, do not attempt to
open any part of the unit. no user-serviceable parts inside. refer
servicing to qualified service personnel.
Warning: To reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture. objects filled with liquids, such as vases,
should not be placed on this apparatus to completely disconnect this
apparatus from the ac mains, disconnect the power supply cord plug
from the AC receptacle
The mains plug of the power supply cord must remain readily accessible
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other
apparatus (including amplifiers) that produce heat.
9. 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 had two
blades and a third grounding prong. The wide blade or the third prong are provided for
your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
User Manual DMS48 V1.1 5

1 IMPORTANT SAFETY INSTRUCTIONS
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles and the point where they exit from the apparatus.
11. Only use attachments / accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualified service personnel. Service is required when the apparatus
has been damaged in any way, such as power-supply cord or plug damaged, liquid has
been spilled or objects have fallen into the apparatus, this apparatus has been exposed
to rain or moisture, does not operate normally, or has been dropped.
Safety Warnings
•Permanent disconnection from the mains supply is to be achieved by
removing the supplied cord connector from the back of the unit.
•Do not remove any covers, loosen any fixings or allow items to enter
any aperture.
•Objects filled with liquids should not be placed on this apparatus.
•Replace the mains fuse only with a fuse of the same type
Installation instructions
1. This product must be earthed. Use only a flexible cable or cord provided with a green
or green and yellow core which must be connected to the protective earthing terminal
of a suitable mains plug or the earthing terminal of the installation. The cord must be
of maximum length 7.5 meters, rated SJ, SJT, or SJE, 10A minimum and be marked
VW-1.
2. Wiring to this product must only be made by suitably qualified personnel and must
comply with all local requirements.
3. Do not install this equipment in an enclosed space. Do not limit free ventilation and
movement of air around the back panel.
4. Only use attachments and accessories approved by or specified by the manufacturer.
For customers in Europe
This product complies with both the LVD (electrical safety) 73/23/EEC and EMC(electromagnetic
compatibility) 89/336/EEC directives issues by the commission of the European community.
Compliance with these directives implies conformity with the following European standards:
•EN60065 Product safety
•EN55103-1 EMC emissions
•EN55103-2 EMC immunity
This product is intended for the following electromagnetic environments: E1, E2; E3 & E4.
User Manual DMS48 V1.1 6

2 THANKS AND UNPACKING
For customers in the USA
This product has been tested for electrical safety and complies with: UL60065 7th edition.
Federal Communications Commission Notice This equipment has been tested and
found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try and correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the distance between the equipment and the receiver.
•Connect the equipment to an outlet on a circuit different from that to which the receiver
is connected.
•Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: Any changes or modifications not expressly approved by the party responsible
for compliance could void the users authority to operate this equipment. This equipment has
been designed to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
For customers in Canada
This product has been tested for electrical safety and complies with: CA /CSA C22.2 No.60065-
03
Declaration of Conformity with Canadian ICES-003 This Class A digital apparatus com-
plies with Canadian ICES-003.
2 Thanks and Unpacking
Thank you for choosing the APG DMS48 processor for your application. Please spare a little
time to study the contents of this manual, so that you obtain the best possible performance
from this unit. All APG products are carefully engineered for world-class performance and
reliability. If you would like further information about this or any other APG product, please
contact us. We look forward to helping you in the near future.
2.1 Unpacking the APG DMS48
After unpacking the unit please check carefully for damage. If damage is found, please notify
the carrier concerned at once. You, the consignee, must instigate any claim. Please retain all
packaging in case of future re-shipment.
User Manual DMS48 V1.1 7

3 INTRODUCTION AND KEY FEATURES
3 Introduction and Key Features
3.1 Introduction
The APG DMS48 processor represents current state-of-the-art technology. Taking advantage
of the latest advances in analogue to digital conversion and digital signal processing technolo-
gies the units achieve performance levels higher than previous devices. Below is a list of key
features, followed by some information on the major advancements of the DMS48 feature set.
3.2 Key Features
•APG minimal signal path design
•Bandwidth: 96kHz sampling frequency provides for a nominally flat response beyond
40kHz.
•Three rotary encoders, illuminated buttons and graphical display provide a rapid, intuitive
and user-friendly control interface
•High speed capable and flexible Ethernet communications that supports DHCP, static-
IP and auto-IP and direct connection to a computer without the need for a router or a
switch
•Class leading sonic performance achieved by the use of state of the art converters, a 4th
Generation Analogue Devices Sharc DSP and highly advanced DSP algorithms
•Powerful Drive Module concept, abstraction from device centric to speaker based control
•Unique VX limiter providing dynamic control for passive 2-way enclosures
•Unique LIR linear phase crossover shapes giving FIR-like performance without the draw-
backs
•Linear phase HF system EQ profiling which provides perfect integration between enclo-
sures
•Innovative excursion control limiter with sliding High Pass Filter; retains dynamic impact
whilst effectively protecting drivers.
•Transducer thermal modelling provides regulation limiters, addressing long term overload
•Overshoot limiter governs amplitude of transient signals retaining average power whilst
constraining peak energy
•Dante audio networking with AVB upgrade path
•AES3 inputs and outputs switchable in pairs
•High performance universal mains switch mode power supply, designed in-house.
User Manual DMS48 V1.1 8

3 INTRODUCTION AND KEY FEATURES 3.3 Drive Modules
3.3 Drive Modules
The DMS48 processor has a new way of ordering and grouping channels in order to give a
more speaker based approach to controlling, designing and recalling speaker configurations;
these are called Drive Modules. A Drive Module is the Processing provided by one Input DSP
Block, and a number of Output DSP Blocks, which are associated with one-another by means
of routing. For example, if Input DSP Block B is routed to Outputs 3 and 4, then this is a
2-way Drive Module with Input DSP Block B forming the Master control, and Output DSP
Blocks 3 and 4 providing the driver-related control. Overall, this forms the control typically for
one loudspeaker sub-system. The PWAPG Drive Module control panel for this sub-system may
then be used for control and monitoring. The Presets in the DMS48 are Drive-Module centric,
and are used to configure individual Drive Modules rather than the whole device. Importantly,
Drive Modules move the focus away from the processing device, and onto the loudspeaker
systems.
3.4 LIR Linear Phase Crossover Filtering
The DMS48 also includes a new type of crossover filtering Linea Impulse Response (LIR)
crossover filtering, which gives a Linear Phase crossover that has a constant delay regardless
of frequency (unlike other types of crossover which delay different frequencies to a different
extent, thus smearing the arrival time). The LIR crossover can thus be described as having
a flat Group Delay response, and thus entirely free of Group Delay Distortion. The shape of
the LIR crossover filter is quite similar to a 4th order or 24dB/Oct Linkwitz-Riley filter, and
maintains zero phase difference between the adjacent bands across the crossover region to
keep the polar response rock steady. See illustration 1.
6
0
-6
-12
-18
-24
-30
-36
1 kHz
Frequency
100 10kHz
24 dB/octave
Figure 1: LIR Filter
3.5 FIR Linear Phase Equalisation
The Input High-Shelf Equalisers use Finite Impulse Response (FIR) filtering to produce Linear
Phase equalisation; that is all frequencies are delayed by the same amount, perfectly preserving
the transient response. This can also be important in applications where different amounts of
EQ are applied to different parts of a speaker cluster, such as to add ’Throw’ EQ boost so
that parts of cluster which are throwing further can have HF absorption correction added. If
User Manual DMS48 V1.1 9

3.5 FIR Linear Phase Equalisation 3 INTRODUCTION AND KEY FEATURES
this EQ is not linear phase, then the zones where the speakers combine may suffer frequency
response anomalies.
User Manual DMS48 V1.1 10

A MENU BUTTONS
The User Guide
This user manual gives a progressively more detailed description of the functions of the APG
DMS48 processor. A single page quick reference guide is provided for those users who are
experienced with this type of equipment and just need to know how to drive the front panel. A
detailed explanation of the front and rear panel controls and indicators is contained in the next
section. The final section describes each individual function or feature with annotated images
explaining its use. Where appropriate, the graphical display is shown to further elaborate on
the units operation. To complete the manual a reference section is included, describing the
technical performance of the device complete with graphs of filter responses and details of the
Drive Module presets and their configuration.
A Menu Buttons
There are three buttons to determine which section of the device to view or edit. The <OUT>
button displays pages of parameters associated with a particular output channel. The <IN>
button displays pages of parameters associated with a particular input socket or input DSP
channel. Pressing <IN>or <OUT>buttons repeatedly will scroll through the inputs/outputs
of the processor. After the last channel, navigation returns to the default screen. The <UTIL>
button displays pages of miscellaneous parameters not associated with any particular channel.
Whilst in Edit mode, one of these three buttons will be illuminated. They are mutually exclusive
pressing one of the buttons will deselect any others that are active.
A.1 Front Panel
6-
Parameter
Encoders
4-
Graphical
Display
8- Output
Mute
Buttons
2/3- Input
Signal
Indicators
1- Page
Selection
Buttons
5-
Status
Indicators
7/9-
Limiters /AES3
Indicators
Figure 2: Front panel schema
A.1.1 Page Selection Buttons
When one of the buttons <IN>,<OUT>or <UTIL>is illuminated, the up <N>and down
<H>arrows will also illuminate, informing the user that these buttons may be used to scroll
through the various pages of parameters that may be viewed and edited. The <ENT>button
is used to confirm an operation such as storing or recalling a preset or snapshot
A.1.2 Input Signal Indicators
A set of five indicators show Sig,-12,0,+6 and +12 for each of the DSP inputs A B C D.
The signal present Indicators operate at approximately 40 dBu, giving a useful indication of
User Manual DMS48 V1.1 11

A.1 Front Panel A MENU BUTTONS
even relatively low input signal levels. The 0indicators are intended to show nominal operating
level and can also be useful for setting system gain structure.
A.1.3 Input Clip/mute Indicator
The input clip/mute indicator CLP warns the user of either input mute or input overload at
+19 dBu. The overload indicator will only come on when all other signal lights are illuminated.
If the other lights are off, this indicator shows a muted input state. Input mute is turned on/off
in the <IN>gain page.
This differs from the CLP indication, as this remains illuminated at all times whilst mute
is active.
A.1.4 Graphical Display
When the device is switched on, it will show the default screen. This provides a useful overview
of channel allocation and Drive Module presets. The screen contrast can be changed by pressing
the <UTIL>button to navigate to Screen and using encoder Awill change the percentage;
this can also help with the viewing angle. In most pages the currently selected channel and
parameter information is displayed on the upper part of the screen and the parameter value
on the lower part of the screen.
A.1.5 Status Indicators
The OVERLAY indicator shows when there are parameters active on a group layer, which
the user cannot access through the front panel of the device. The NETAUDIO indicator
shows that a networked digital audio card is installed and routed (Such as Dante or AVB). The
ONLINE indicator has three states:
Off The unit is offline and not connected to a computer or network.
Flashing The unit is searching for an IP address, if the unit does not find an IP address the
unit will assign itself an IP address automatically and the indicator will stop flashing.
On The unit is online and connected with software. IP settings can be viewed or changed
within the <UTIL>pages.
A.1.6 Parameter Encoders
Three velocity sensitive parameter encoders are used to adjust parameters shown on the display.
Up to three parameters at a time are displayed on the screen. The parameter name is shown
above the parameter value in each of the three screen sections.
A.1.7 AES3 Active Indicators
The AES3 active indicators show that the AES3 input/output is active for that pair of channels.
AES3 transmits two channels down one XLR cable. On the DMS48 each pair is carried by
the odd number connector such as, 1+2 will be carried on XLR connector 1 and 3+4 will be
carried on XLR 3 and so on.
A.1.8 Mute Buttons
DSP output mute status is indicated and controlled by illuminated buttons for each channel.
User Manual DMS48 V1.1 12

A MENU BUTTONS A.2 Rear panel
A.1.9 Limiter Indicators
The limiter indicators are a collection of indicators which signal different information about
the limiter status. The <SIG>indicator shows signal presence and will illuminate when a
signal above - is present in the output. The second indicator <-6dB>shows that the signal
has reached 6dB below the limiter threshold. The third <LIM>indicator signals that the
threshold of that output channel has been reached. The <X>indicator also refers to the
excursion limiter and will illuminate when the threshold of the excursion limiter has been
reached. This <X>also indicates a signal 6dB higher than the limiter threshold. The <T>
indicator shows that the power limiter is active, which will prevent long term thermal damages.
Please note that because of the long release time of the thermal limiter, the <T>indicator
may remain illuminated for several seconds after signal on that channel is reduced. The <T>
indicator illuminates when the limiter is in at least 1dB of limit.
A.1.10 Selection Indicators
Each page that is visited when navigating will usually show either one, two or three parameters
labelled A,Band C, each of which can be edited by turning the Encoder associated with that
parameter also labelled A,Band C.
A.2 Rear panel
1-
Ethernet
Port
5-
Power
Inlet
3- Audio
Output
Connectors
4- Audio
Input
Connectors
2- Optional Networked
Audio Ports
(ex: Dante)
6-
Aux Port
Figure 3: Rear panel
A.2.1 Ethernet Communications Port
APG DMS48 processor may be controlled entirely from another controller, typically a Personal
Computer, running an application that is compliant with the ObCom standard such as PWAPG.
Connection will normally be made to the controller via this Ethernet port connector. This port
is also used for updating the firmware in the unit.
A.2.2 Networked Audio Ports
The DMS48 has the option for networked audio ports; if none are required a blanking plate
will be fitted. There are several options for networked audio including Dante and AVB. For a
full list please consult your vendor.
User Manual DMS48 V1.1 13

B OPERATION
A.2.3 Audio Output Connectors
The processed outputs are impedance balanced, and wired; pin-1 directly bonded to ground as
required by the AES48 standard, pin-2 hot and pin-3 cold. An unbalanced input may be driven
by connecting pin 3 cold to the ground connection at the source end. When AES3 operation
is selected on an output pair, the Odd channel connector is used for both channels (e.g. Input
1 is used for channels 1 and 2).
A.2.4 Audio Input Connectors
All audio connections are fully balanced and wired; pin-1 ground as required by the AES48
standard, pin-2 hot & pin-3 cold. If an unbalanced source is used, a connection should be
made between the pin-3 cold signal and the ground connection at the source end. When AES3
operation is selected on an input pair, the Odd channel connector is used for both channels
(e.g. Input 1 is used for channels 1 and 2).
A.2.5 Power Inlet
The APG DMS48 unit should be connected to a suitable mains electricity supply using an
earthed IEC C14 connection power lead. The processor has a switch mode power supply
that is capable of operating with a nominal mains voltage of 85V to 240V, 50/60Hz without
re-configuration.
Note: The DMS48 must be earthed to a suitable power earth; failure to do so may affect
performance and/or operation and will invalidate warranty and could be potentially hazardous.
A.2.6 Auxiliary Port
The auxiliary port is used for recalling the first two snapshots stored.
Also see AUX Port on page 25
B Operation
B.1 Starting up the unit
The unit will power up as soon as power is applied to the IEC power inlet; there is no power
switch. When power is present the unit will go through its start-up cycle - first all the indicators
will illuminate then go off, while the screen displays the boot loader information. Next the
screen will display the application firmware information, and all the mute buttons will illuminate.
The display will then show the default screen showing drive module configurations, the mutes
will then return to the state they were in when the unit was powered off.
User Manual DMS48 V1.1 14

B OPERATION B.2 Drive Module Presets
B.2 Drive Module Presets
Device
Preset name and ID
for DSP input Output affected to DSP input
1 bloc =
1 DSP input
DSP input
name
Figure 4: Main screen
The DMS48 uses Drive Module presets, which are defined as a number of outputs driven
from one DSP input. This system allows for better flexibility and greater functionality when
loading and storing presets. Drive modules allow for a less processor centric and more speaker
orientated system design. A drive module is the processing provided by one Input DSP, and a
number of outputs, which are associated with one-another by means of routing. For example,
if Input DSP B is routed to outputs 3 and 4, then this is a 2-way drive module with input DSP
B forming the master control, and output DSP 3 and 4 providing the driver-related control.
Overall, this forms the control typically for one loudspeaker sub-system. The Input DSP
parameters then control the Drive Module, and the Drive Module control panel in the PWAPG
application is then used for control and monitoring of this sub-system. Outputs assigned DSP
Input letter Presets are Drive Module centric, in that a preset will change only the parameters
in the given Drive Module (determined by which Input the preset is recalled to).
Note: DSP inputs are not the same as physical inputs. The DMS48 has four audio
inputs and four DSP inputs. This is a matrix mixing system where any physical inputs, be
they analogue, AES3 or networked audio feeds, can drive any number of DSP inputs.
Also see Snapshots on page 24
B.3 Navigation and Parameters Edition
A
OUT
IN
User Manual DMS48 V1.1 15

B.4 Factory Presets B OPERATION
A
The DMS48 has 45 drive module preset locations and these can be stored and recalled
from the <IN>pages, for the channel being viewed. To design a new crossover, press the
desired <IN>or <OUT>button to enter the pages where the parameters for each of the
channels are shown. Once in these pages the up <N>and down <H>buttons will scroll
through the parameters for the inputs/outputs through the signal chain. Pressing the <IN>
or <OUT>button repeatedly will scroll through the channels. This allows the user to enter
all the parameters for each of the channels in the signal chain or enter each parameter for each
channel one after another.
A
A parameter may be adjusted when it is displayed by turning one of the three-parameter
encoders A,Bor C. Each of the three-parameter encoders is associated with a zone on the
display. Adjusting the leftmost parameter encoder Awill change the value of the parameter
showing in the leftmost zone of the display above the Aand so on. Turning an encoder
clockwise will increase the value of a parameter, or anticlockwise will decrease it. The encoders
are velocity-sensitive so turning an encoder rapidly will cause the action to accelerate, so the
value changes more rapidly.
B.4 Factory Presets
The device may contain a library of Factory Presets designed to suit a range of enclosures.
Factory Presets contain some parameters that are fixed and hidden from view; the remainder of
the parameters are available for user manipulation. The number and type of hidden parameters
is dependent on the Factory Preset, typically crossover frequencies, output delay and some EQs
are hidden; those settings that are a function of the loudspeaker cabinet design and should not
require adjustment for different applications. Factory Presets are locked (as indicated by a box
symbol after the Preset name) so they cannot be over-written. The user can, however, store
an edited version of a Factory Preset in any free preset location. In addition to the Factory
Presets the device may have further Skeleton Presets which will help to create new presets.
They can be used to develop settings for any loudspeaker combination and are recalled in the
User Manual DMS48 V1.1 16

C INPUT B.5 Storing Presets
same way as the Factory Presets described above. These Presets are also usually locked but
the user can name and store their own edited versions in any free preset location.
B.5 Storing Presets
ASTOR
Preset1
Preset
23
Name
ABCD
Once a drive module has been created it can be stored by pressing the <IN>button
until the edited channel is reached, then pressing the down <H>button until store page is
reached. Using encoder Awill change the preset number. When the destination preset is
reached, pressing the <ENT>button will enable the name associated with that preset to be
changed. Once the name changing is active, the character to be changed will be highlighted
and encoder Cwill edit the character. Using encoder Bwill move through the character
positions. Once the new preset name has been entered, the operation can be confirmed by
pressing the <ENT>button, then a message will be displayed, "ENT to confirm or Hto exit";
pressing <ENT>will store the preset.
B.6 Recalling Presets
ARECL
Preset1
Preset
23
Name
Preset2
To recall a preset, press the <IN>button, then using the down <H>button navigate to
the RECL Preset page. Using the encoder, Awill scroll through the presets available. When
the desired preset is reached, pressing <ENT>will display the message "ENT to confirm or
Hto exit", pressing <ENT>will recall the preset.
Also see Snapshots on page 24.
C Input
C.1 AES3 / Network Inputs
AROUT
Preset1
Source
Analog
AES3
0.0dB
Net
0.0dB
In addition to the usual analogue inputs, the DMS48 can also accept AES3 digital inputs.
The same physical XLR sockets are used for both Analogue and AES3 inputs; the function
of these being determined by the Source parameters in the Input Route menu. The Input
sockets 1 and 3 are used to input pairs of AES3 channels, so adjusting the input to AES3
on either Input 1 or Input 2 will cause the other channel to change also. Similarly, adjusting
the setting of Input 3 will affect Input 4 and vice-versa. When an input socket is selected
User Manual DMS48 V1.1 17

C.2 Gain and Polarity C INPUT
for AES3 operation, the AES3 indicator under the input meters will illuminate. So that the
relative gain between an Analogue input and an AES3 input can be normalised, it is possible
to adjust the gain of the AES3 channel using the Input Route AES3 Gain parameter. This
device will automatically select the correct sample rate from the incoming stream between
28kHz and 108kHz. When the Digital Audio Network option (e.g. Dante) is fitted, it is also
possible to select any channel(s) as being sourced from this network. To do this, connect the
audio network connection to the connection on the rear of the DMS48, and set the relevant
Input Route menu Source parameter to Dante (for example.) When the Digital Audio Network
input is installed and routed, the Net Audio indicator above the encoders will illuminate. This
indicator will come on even if there are no cables plugged into the networked audio port on
the DMS48. Again, it is possible to set the relative gain between an Analogue input and the
Digital Audio Network (Dante) using the Input Route Dante gain parameter. This device will
automatically select the correct sample rate from the incoming stream. For other details on
the operation of the Digital Audio Network, please refer to the relevant documentation.
C.2 Gain and Polarity
AGAIN
Preset1
Gain
0.0dB
Pol
Norm
Mute
Norm
The gain page of the input channel selected allows users to increase or decrease the amount
of signal going into the selected input. Using encoder Awill change the value in 0.2dB steps
from -40dB to +20dB. This page will also allow users to change the polarity of the selected
input from normal to reverse, using encoder B. Using encoder Cwill mute the selected channel.
C.3 Delay
ADEL
Preset1
Delay
0ms
The delay page which controls the amount of delay associated with the input channel
selected and is adjustable from 0 to 998ms. The delay parameter is adjustable in fine steps at
low values; the adjustment becomes progressively coarser as the value increases.
C.4 High Pass Filter
AHPF
Preset1
Freq
<<Out
Shape
But24
System high pass filtering is provided for the input signal. Filter type is selectable from 1st
order, Butterworth, Bessel, Linkwitz-Riley and Hardman. Filter slopes of up to 4th order or
24dB / octave are provided. Not all filter types are available in all slopes. For example 18dB
/ octave Linkwitz-Riley filters do not exist. The Hardman type filter is always described by
User Manual DMS48 V1.1 18

C INPUT C.5 Parametric Equalisation
its order as the filter becomes progressively steeper rather than following a linear slope so a
dB/octave description is not accurate.
C.5 Parametric Equalisation
There are eight stages of equalisations available for each input channel, two shelving filters
and six parametric filters.
C.6 FIR Shelving EQ
AFIR/
Preset1
Freq
100Hz
Gain
0.0dB
The Input High Shelf EQ is implemented using a Finite Impulse Response (FIR) filter, and
exhibits a linear phase response; that is all frequencies are delayed by the same amount. This
can be important in applications where different amounts of EQ are applied to different parts of
a speaker cluster, such as to add ’Throw’ EQ boost so that parts of cluster which are throwing
further can have HF absorption correction added. If this EQ is not linear phase, then the zones
where the speakers combine may suffer frequency response anomalies. Being a linear phase
FIR equaliser, this necessarily introduces some latency delay, which is constant regardless of
the settings. However, when the frequency is set to maximum (Off), it is removed from the
signal path entirely, so it does not add any latency. Using encoder Awill change the frequency
parameter from 2kHz to 20kHz and using encoder Cwill change the cut or boost in 0.2dB
increments. The filter (and its associated latency) can be completely removed by setting the
frequency parameter to the maximum off position.
Also see Latency Delays on page 25.
C.7 Parametric Filters
AEQ1
Preset1
Freq
100Hz
Width
1.0oct
Gain
0.0dB
Parametric filters are defined by frequency, bandwidth and gain. The frequency is controlled
by encoder Aand ranges from 10Hz to 25.6kHz. The bandwidth, shown as Width on the
screen, is controlled by encoder Band ranges from 0.10 octaves to 5.2 octaves. Bandwidth
can be shown and adjusted as Q or Octaves (Oct). Gain is controlled by encoder C and is
available in 0.2dB increments.
Also see Bandwidth Units on page 23.
C.8 Routing
AROUT
Preset1
Source
Analog
AES3
0.0dB
Net
0.0dB
User Manual DMS48 V1.1 19

D OUTPUT
Routing allows users to route any physical or digital signal to any DSP input. This is a
matrix mixing system where all DSPs can be driven from any one input or pairs of inputs 1+2
or 3+4. Summed inputs have 6dB of attenuation so that a sum of largely similar programme
material remains at the correct calibrated level. When a sum input is selected, the input DSP
meters show the higher of the two inputs so that indication of the onset of clipping of either
input is indicated.
D Output
D.1 AES3 outputs
1ROUT
Outname
Source
DSP A
XLR
Analog
In addition to the usual analogue outputs, the DMS48 also allows outputs to be sent
digitally using AES3. The same physical XLR sockets are used for both Analogue and AES3
outputs; the function of these being determined by the XLR parameters in the Output Route
menu. The Odd numbered output sockets are used to output pairs of AES3 channels. When
an output socket is selected for AES3 operation, the AES3 indicator under the output bar
graphs will illuminate. The output sample rate for AES3 will always be 96kHz.
D.2 Gain and Polarity
AGAIN
Preset1
Gain
0.0dB
Pol
Norm
Mute
Norm
The gain page of the output channel allows users to increase or decrease the relative signal
gain for the selected output. Using encoder Awill change the value in 0.2dB steps from -40dB
to +20dB. This page will also allow users to change the polarity of the selected output from
normal to reverse, using encoder B.
D.3 Delay
The delay page controls the amount of delay associated with the output channel selected and
is adjustable from 0 to 998ms. The delay parameter is adjustable in fine steps at low values;
the adjustment becomes progressively coarser as the value increases.
D.4 High and Low pass Filters
High pass crossover filtering is provided for the output signal. Filter type is selectable from 1st
order, Butterworth, Bessel, Linkwitz-Riley, Hardman and LIR Linear Phase using encoder B.
Filter slopes of up to 8th order or 48dB / octave are provided. Not all filter types are available
in all slopes. For example 18dB / octave Linkwitz-Riley filters cannot be selected because they
do not exist. The Hardman type filter is always described by its order as the filter becomes
progressively steeper rather than following a linear slope so a dB/octave description is not
accurate.
User Manual DMS48 V1.1 20