APG DMS26 User manual

USER GUIDE
DIGITAL MANAGEMENT SYSTEM
PROCESSOR
DMS26

DIGITAL MANAGEMENT SYSTEM DMS26 1
APG FRANCE
User Guide
Digital Management System APG DMS26
Version 1.0
Août 2006

DIGITAL MANAGEMENT SYSTEM DMS26 2
SUMMARY
SUMMARY ...................................................................................................................................................................................2
SAFETY INSTRUCTIONS ..........................................................................................................................................................3
QUICK REFERENCE GUIDE .....................................................................................................................................................4
THANKS AND UNPACKING ......................................................................................................................................................6
Unpacking the APG Digital series processor .........................................................................................................................6
IMPORTANT SAFETY INFORMATION .....................................................................................................................................6
REGULATORY COMPLIANCE ..................................................................................................................................................6
INTRODUCTION AND KEY FEATURES...................................................................................................................................7
DMS26 PRESENTATION ...........................................................................................................................................................8
FRONT VIEW...........................................................................................................................................................................8
REAR VIEW .............................................................................................................................................................................9
OPERATION ..............................................................................................................................................................................10
Starting up ..............................................................................................................................................................................10
Selecting a Factory Preset ....................................................................................................................................................10
Creating a Crossover.............................................................................................................................................................10
Navigation and Viewing Parameters.....................................................................................................................................10
Navigation ..............................................................................................................................................................................11
Presets ...................................................................................................................................................................................12
Preset Recall ..........................................................................................................................................................................12
Preset Store ...........................................................................................................................................................................12
DSP PROCESSING LAYOUT ..................................................................................................................................................13
Input DSP block diagram.......................................................................................................................................................13
Output DSP block diagram....................................................................................................................................................13
Stereo / Mono Formats..........................................................................................................................................................13
DSP processing - Input Channels.........................................................................................................................................14
Gain ..........................................................................................................................................................................................................14
Delay.........................................................................................................................................................................................................14
High Pass Filter ........................................................................................................................................................................................14
Parametric Equalisation ...........................................................................................................................................................................15
High and Low shelving filters ...................................................................................................................................................................15
Parametric filters ......................................................................................................................................................................................15
Output Channels ....................................................................................................................................................................16
Gain and Polarity......................................................................................................................................................................................16
Delay.........................................................................................................................................................................................................16
High and Low Pass Filters .......................................................................................................................................................................16
Parametric Equalisation ...........................................................................................................................................................................17
Limiters .....................................................................................................................................................................................................18
Routing .....................................................................................................................................................................................................18
UTILITIES ..................................................................................................................................................................................19
EQ AND FILTER RESPONSE GRAPHS.................................................................................................................................20
Butterworth .............................................................................................................................................................................20
Linkwitz-Riley .........................................................................................................................................................................20
Bessel.....................................................................................................................................................................................21
Hardman.................................................................................................................................................................................21
Filters Baxendall ....................................................................................................................................................................22
Parametrics Filters .................................................................................................................................................................22
TECHNICAL SPECIFICATION .................................................................................................................................................23
General...................................................................................................................................................................................23
Processing..............................................................................................................................................................................23
Connectors.............................................................................................................................................................................23
Characteristics .......................................................................................................................................................................23
RECALL SHEET........................................................................................................................................................................24

DIGITAL MANAGEMENT SYSTEM DMS26 3
SAFETY INSTRUCTIONS
This symbol, wherever it appears, alerts
you to the presence of uninsulated
dangerous voltage inside the enclosure –
voltage that may be sufficient to constitute
a risk of shock.
This symbol wherever it appears, alerts
you to important operating and
maintenance instructions in the
accompanying literature. Read the
manual.
Caution: To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside; refer
servicing to qualified personnel.
Warning: To reduce the risk of fire electrical shock, do not expose this appliance to rain or moisture.
DETAILED SAFETY INSTRUCTIONS
All the safety and operation instructions should be read before the appliance is operated.
Retain instructions:
The safety and operating instructions should be retained for future reference.
Heed warnings:
All warnings on the appliance and in the operating instructions should be adhered to.
Follow instructions:
All operation and user instructions should be followed.
Water and moisture:
The appliance should not be used near water (e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool etc..)
Ventilation:
The appliance should be situated so that its location or position does not interfere with its prosper ventilation. For
example, the appliance should not be situated on a bed, sofa rug, or similar surface that may block the ventilation
openings, or placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the
ventilation openings.
Heat:
The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances
(including amplifiers) that produce heat.
Power source:
The appliance should be connected to a power supply only of the type described in the operating instructions or as
marked on the appliance.
Grounding or polarization:
Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
Power-Cord Protection:
Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or
against them, paying particular attention to cords and plugs, convenience receptacles and the point where they exit from
the appliance.
Cleaning:
The appliance should be cleaned only as recommended by the manufacturer.
Non-use Periods:
The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.
Object and liquid Entry:
Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
Damage Requiring Service:
The appliance should be serviced by qualified service personnel when:
-The power supply cord or the plug has been damaged; or
-objects have fallen, or liquid has been spilled into the appliance; or
-the appliance has been exposed to rain; or
-The appliance does not appear to operate normally or exhibits a marked change in performance; or
-This appliance has been dropped, or the enclosure damaged.
Servicing: The user should not attempt to service the appliance beyond that is described in the Operating instructions.
All other servicing should be referred to qualified service personnel.

DIGITAL MANAGEMENT SYSTEM DMS26 4
QUICK REFERENCE GUIDE
Display
The LCD displays preset and parameter information. The default screen is shown after start up and displays the number
and name of the current preset on the lower line of text. When navigating around the adjustable parameters, other
information is shown.
Channel Select Buttons
The currently selected input or output channel is shown in the top left corner of the display. Pressing the channel select
buttons scrolls through the available inputs and outputs. If operating stereo linked the channel pair is shown. For
example ‘CH A+B’ means both input A and B parameters.
Edit Select Buttons
The name of the edit parameter page is displayed in the bottom left portion of the LCD. Pressing the edit select buttons
moves through the available parameter pages for the current input or output.
Parameter Knobs
Up to three parameters are shown on the display. The parameter name is shown with its’ current value below. Where
appropriate, parameters are grouped according to function. For example the parametric equalisation page shows centre
frequency, width and gain. Turning a parameter knob clockwise will increase the value of a parameter, turning anti-
clockwise will decrease it. Turning a knob rapidly will cause the action to ‘accelerate’, so the value changes more rapidly.
Mute Buttons
The LEDs next to the mute buttons indicate their current status. Pressing a mute button toggles between the mute on
and off.
Store Button
The unit has 45 preset locations. To store a preset in a location, press the store button and use the parameter knobs to
select the preset location and name the preset. Pressing the store button again completes the task. Pressing any button
other than store during the process cancels the procedure.
Recall Button
To recall a preset, press the recall button and use parameter knob A to select the required preset. Pressing the recall
button again will activate the preset. You will then be asked to confirm by pressing recall once more. As with the store
function, pressing any button other will cancel the process.
Limiter Settings
In order to offer the maximum of protection, some factory presets of the DMS26 can be entered with the fixed limiting
device with 0 dBu, limiting the power to approximately 30 W in 8 Ohms.
It is then essential to set the threshold according to your devices.
To do it :
- with the front panel buttons
• Use “CH” button to go to the selected output
• Use the “Parameter” button to go to the Threshold parameter
• Adjust with the parameter knob.

DIGITAL MANAGEMENT SYSTEM DMS26 5
- with dedicated software
• Go to panel control of DMS26 (Device then Add Device Panel, select DMS26, press enter)
• Open selected “Output” window (1 to 6)
• Setting Threshold is located at the bottom right and can be adjusted from - 40 to +20 dBu
The following table expresses the threshold corresponding to the nominal output power provided by the amplifier.
Values for a standard gain of 26 dB
Level en dBu Power below 8 Ohms Power below 4 Ohms
0 30W 60W
+1 38W 76W
+2 48W 96W
+3 60W 120W
+4 75W 150w
+5 95W 190W
+6 120W 240W
+7 150W 300W
+8 190W 380W
+9 240W 480W
+10 300W 600W
+11 380W 760W
+12 480W 960W
+13 600W 1200W
+14 760W 1520W
+15 960W 1920W
+16 1200W 2400W
+17 1520W 3040W
+18 1920W 3840W
Limiter threshold
: threshold (dBu) = 20 log ((Power (W) x Impedance (Ohms))/0,775) –amplifier gain (dBu)
Assignment of the input signals towards output signals
- with the front panel buttons
• Use “CH” button to go to the selected output
• Use the Parameter button to go to the “source” function.
• Choose source with the first knob which offers possibility between the Inp_A, Inp_B & Sum_A+B
- with dedicated software
• Go to panel control of DMS26 (Device then Add Device Panel, select DMS26, press enter)
• Open Crossover window.
• Access to the choice of the source is in the first column of the table.
Connection to a computer
Connection RS232
Many laptops do not comprise a connection series RS232. It is then advisable to use a converter USB towards RS232.
Unfortunately, few converters meet the requirements to perform correctly with the DMS26. The converters must be
equipped with chips FTDI or Prolific X (imperative version “X”).
The following onverters USB - RS 232 were tested and are satisfactory.
- Aten UC 232A (Is the one with the most updated drivers)
- Easysync US232B
- Easysync USB-COM
An 9 pins extension cable should be envisaged, in addition to the converter, because this device cannot be installed
directly on the DMS26.
PWAPG software is available on request or can be download on our Web site: www.apg.tm.fr

DIGITAL MANAGEMENT SYSTEM DMS26 6
THANKS AND UNPACKING
Thank you for choosing a APG France Digital series loudspeaker management system 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 France products are carefully engineered for world-class performance and reliability. If you would like further
information about this or any other APG France product, please contact us. We look forward to helping you in the near
future.
Unpacking the APG Digital series processor
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.
IMPORTANT SAFETY INFORMATION
Please read carefully and keep the following instructions and safety information. Heed all warnings and follow all
instructions.
- Do not remove covers. There are no user serviceable parts inside, please refer servicing to qualified service
personnel.
- This equipment must be earthed.
- Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
- Only use attachments/accessories specified by the manufacturer.
- Servicing is required when the apparatus has been damaged in any way, such as the power supply cord or
plug is damaged, liquid has been spilled or objects have fallen into he apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.
REGULATORY COMPLIANCE
This product complies with both the EMC Directive (89/336/EEC) and the Low Voltage Directive (73/23/EEC) as issued
by the Commission of the European Community.
Compliance with these directives imply conformity with the following European standards:
- EN60065 : Product safety
- EN55103-1 : Electromagnetic Interference (Emission)
- EN55103-2 : Electromagnetic Susceptibility (Immunity)
This product is intended for operation in the E2 (commercial & light industrial) and E3 (urban outdoors) Electromagnetic
environments.

DIGITAL MANAGEMENT SYSTEM DMS26 7
INTRODUCTION AND KEY FEATURES
Introduction
The APG DMS26 digital processors benefit from the most innovative technologies. Profiting from the last technological
creation as regards analogical conversion/digital conversion and of numerical signal processing, these processors offer
top-of-the-range professional performances.
Technical specifiation
Combination of converters A/D and D/A made up with components of high range produced by Burr Brown and Wolfson,
selected carefully to offer an excellent sound quality.
DSP Processors of new generation Analogue Devices SHARC.
Bandwidth extended of 10Hz to 40 Khz and sampling rate of 96 Khz, for a perfectly linear frequency response.
Keys and LCD screen allowing an adjustment of the parameters simple and intuitive.
PC software: PWAPG
2 input / 6 analogue output
A/D & D/A Converters, 24 bits / 96 kHz
50 memories of configurations
High sound quality
APG dedicated Presets
Software control
User friendly
Applications
Management and treatments for system in multi diffusion APG, with or without subwoofer
Digital delay
Egalization for APG loudspeakers
Area management & signal distribution
Specifications
Bandwidth : 10 Hz - 40 kHz
Dynamic >112 dB
High pass Filter & low pass shelving,
Bessel, Butterworth, Linkwitz crossover Filters
Riley, Hardman
400 ms input Delay, 80ms output
Limiting threshold by 0.2 dB step
Parametric EQ 6 bands per input and output, 10 Hz with 25.4 Khz by step of 1/36 octave
Possible locking of controls of the front panel
Serial port standard
Port Network optional
Introduction
The APG Digital series of loudspeaker management systems represent the current state-of-the-art. Taking advantages of
the latest advances in analogue to digital conversion and digital signal processing technologies the units achieve
performance levels that have only recently been made possible.
Key Features
Linea Research minimal signal path design
Sonically superb ADC / DAC combination; a carefully matched pairing of the best devices from Burr Brown and Wolfson
Newly released family of Analogue Devices SHARC DSP
Extended bandwidth; 96kHz sampling frequency provides for a nominally flat response to 40kHz.
Parameter knob and LCD provide a rapid, user-friendly control interface

DIGITAL MANAGEMENT SYSTEM DMS26 8
DMS26 PRESENTATION
FRONT VIEW
1 - Input Signal Indicators
A set of three pairs of LEDs indicate signal present, +4dBu and input clip for each channel. The signal present LEDs
operate at approximately –40 dBu, giving a useful indication of even relatively low input signal levels. The +4 dBu LEDs
are intended to show nominal operating level and can also be useful for setting system gain structure. Clip LEDs warn
the user of input overload and operate at +19 dBu.
2 - Preset Store and Recall
These controls provide access to the 45 presets stored within the device. Pressing the store button allows the user to
name a preset and choose which memory location it will be held in. Pressing store button again completes the process.
The Recall function operates in a similar way, pressing the recall button allows the user to select which preset they
require, pressing the button for a second time, then confirming, recalls the new DSP settings.
Note that presets cannot be stored or recalled when Secure mode is activated
3 - Channel Select Buttons
The currently selected channel is displayed on the top left hand corner of the LCD. Pressing the channel buttons scrolls
through the available input and output channels and finally through the utility functions and back to the default screen. If
operating a stereo linked preset, the channel name will indicate the channel pairing. For example ‘A+B’ means both input
A and B parameters. The name of the output will be shown briefly at the top of the display when stepping onto an output.
4 - Edit Select Buttons
The currently selected edit parameter page is displayed on the bottom left corner of the LCD. Pressing the edit select
buttons moves through the available parameters for the current input or output.
5 - Text Display
Preset, channel, parameter and status information is shown on the 2x 24-character text display. In most screens the
currently selected channel is displayed on the upper line and the edit parameter on the lower line. To simplify the display
and enhance security, some parameters or parameter pages are omitted when not relevant.
6 - Parameter Knobs
Three velocity sensitive parameter knobs 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. The parameter knobs have a fixed association with the screen sections; the rightmost parameter knob
adjusts the rightmost parameter and so on.
7 - Output Signal / Limiter Indication
Two LEDs are provided for each output channel. These show the signal level relative to the limiter threshold. The yellow
LED will light when the signal is 6dB below the threshold and the red warning LED will light when the limiter threshold is
reached.
8 - Mute Buttons and Status LEDs
Each output has a mute button and associated mute status LED. Pressing the button toggles the mute on and off.X
Note that the mute buttons do not function when the Secure mode is activated.

DIGITAL MANAGEMENT SYSTEM DMS26 9
REAR VIEW
9 - Secure Button (on the rear)
A momentary button is fitted behind the rear panel, between the output XLRs and the RS232 port. When activated, this
will disable all the front panel controls so they cannot affect the signal path, making the unit secure against tampering.
When in secure mode, the indicators still operate normally. Note that the communications port is still active in secure
mode.
10 - Power Inlet
The APG Digital series unit should be connected to a suitable mains electricity supply using the cable supplied. 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.
11 - Network Expansion Port
Where a future network card can be fitted.
12 - Audio Input Connectors
All audio connections are fully balanced and wired pin-1 ground, pin-2 hot & pin-3 cold. The two inputs have pin-1
connected directly to the chassis and feed the signal processing chains. If an unbalanced source is used, a connection
should be made between the pin-3 ‘cold’ signal and the ground connection of the unbalanced source.
13 - Audio Output Connectors
The processed outputs are impedance balanced, and wired pin-1 ground, pin-2 hot and pin-3 cold. An unbalanced input
may be driven by connecting pin-3 ‘cold’ signal to the ground connection of the unbalanced destination input. Note that
output pin-1’s are ground lifted at audio frequencies but connected to ground at RF for good EMC performance. The
intention being that the amplifiers the processor is driving should be responsible for the grounding of their input cable
shields.
14 - Communications Port Connector
APG France Digital series processor may be controlled entirely from another controller, typically a Personal Computer,
running an application that is compliant with the ObCom standard. Connection will normally be made to the controller via
this serial port connector. This port is also used for updating the firmware in the unit.
Note that the communications port is NOT disabled when the front panel is made secure using the secure button.
Please contact APG for information about the software of control PWAPG.

DIGITAL MANAGEMENT SYSTEM DMS26 10
OPERATION
Starting up
The unit will energise as soon as power is applied to the IEC inlet; there is no power switch. During the start up process
the firmware application model number and version numbers are displayed and the outputs are muted until the unit has
completed its internal checks. Once the start-up routines are complete and the unit is ready to pass audio. The DSP
signal path will be restored to the current settings when it was last powered down and the audio signal is gradually
ramped up to its correct level.
Selecting a Factory Preset
The APG Digital series processors have a library of Factory Presets designed to suit a range of applications.
Factory Presets contain some parameters that are fixed and hidden from view; the remainder of the DSP parameters are
available for user manipulation. The number and type of hidden parameters is dependant on the Factory Preset, typically
crossover frequencies, output delay and some EQ’s are hidden; those settings that are a function of the loudspeaker
cabinet design and should not require adjustment for different applications.
To recall a Factory Preset for a particular cabinet or system, press Recall and use the left hand parameter knob A to
scroll through the available Factory Preset locations (as indicated bu a box symbol after the preset number). Once the
appropriate preset has been selected press recall again, at which point you will be asked to confirm the action by
pressing recall for a third time. This is to guard against accidental recall of presets.
Factory Presets are locked so they cannot be over-written. The user can, however, store an edited version of a Factory
Preset in any free preset location.
Details of all the Factory Presets including output designations can be found in Appendix A.
Creating a Crossover
In addition to the Factory Presets the unit has two further ‘Base Presets’; mono and stereo. These Base Presets are
stored in locations 1 and 2 respectively, they can be used to develop settings for any loudspeaker combination and are
recalled in the same way as the Factory Presets described above. These presets are also locked but the user can name
and store their own edited versions in any free preset location.
Navigation and Viewing Parameters
Many of the processing elements in each input and output path have features that may be controlled by the user, such as
gain, frequency or limiter threshold. We call these adjustable features parameters.
A parameter may be adjusted when it is displayed by turning one of the three-parameter knobs. Each of the three-
parameter knobs is associated with a zone on the display. Adjusting the leftmost parameter knob will change the value of
the parameter showing in the leftmost zone of the display and so on. Turn a knob clockwise to increase the value of a
parameter, or anti-clockwise to decrease it. The knobs are velocity-sensitive so turning a knob rapidly will cause the
action to ‘accelerate’, so the value changes more rapidly.

DIGITAL MANAGEMENT SYSTEM DMS26 11
Navigation
The DSP parameters are organised by channel. The currently selected channel is shown in the top left hand corner of
the display. You can navigate between the channels by pressing the channel buttons. Pressing the channel buttons will
scroll through the channels, utilities and back to the default screen. When using a Preset that is stereo linked, the
channel selection will reflect this. For example ‘1&4’ indicates outputs 1 and 4. When navigating onto an output channel,
the usage of the output, as define in the Factory Preset, will be shown briefly at the top of the screen.
Pressing the edit navigation buttons gives access to the various pages of parameters available for each channel. The
currently selected page is shown in the bottom left hand corner of the display, this is omitted on some pages where the
function is obvious. The screen shows up to three (normally related) parameters for a given part of the processing
functions on a given channel.
The edit buttons allow you to scroll, in either direction, through the different processing pages for a given Channel. When
you go past the last page, you will be returned to the default page.
The channel buttons allow you to scroll, in either direction, through the input and output channels, whilst trying to
maintain the currently viewed processing block. If the channel you scroll to does not have the currently viewed
processing block, the next one will be shown instead.
NB. When the unit powers-up, the settings will be the same as those when the unit was last switched off.

DIGITAL MANAGEMENT SYSTEM DMS26 12
Presets
The device contains a total of forty-five user and Factory Presets. The user cannot overwrite the basic mono, basic
stereo or Factory Preset programs.
Preset Recall
To select an existing preset, press the Recall Button so the indicator above it illuminates. Turn parameter knob A until the
required preset number is shown on the display. Factory Presets are indicated by a box symbol appearing after the
preset number. Press the Recall Button again to activate the Preset. Pressing any other button will cancel the operation.
Users can develop their own Preset based on one of the Basic or Factory Presets stored within the device. Once a basic
or user Preset has been recalled, a user has complete freedom to adjust any or all of the parameters. Factory Presets
can be used as the basis for user Presets but they have some parameters that are predefined as a function of the
loudspeaker system. These parameters are ‘hidden’ from the user, as they should be constant regardless of application.
Preset Store
To store the current Preset in a user location, press the Preset Store Button so the indicator above it illuminates. Turn the
first parameter knob until the required Preset location number is show on the display. A Preset name of up to 12
characters in length can be entered using parameter knobs B and C. Pressing the Store Button again completes the
process and stores the Preset. As with Preset Recall, pressing any other button cancels the operation.
The user can overwrite non-protected Presets only; if an attempt is made to save a Preset in a location already occupied
by a basic or Factory Preset a ‘LOCKED PRESET’ message is displayed

DIGITAL MANAGEMENT SYSTEM DMS26 13
DSP PROCESSING LAYOUT
Input DSP block diagram
Input A Input
LED’s Input Gain Delay 4
th
Order
HPF Low Shelf EQ Six Band PEQ High Shelf EQ
Routing
Input B
SUM - 6dB
NB. Channel B processing is
identical to Channel A but for
clarity it is not shown
Output DSP block diagram
Routing
Delay 8th Order
HPF 8th Order LPF Low Shelf EQ Six Band PEQ High Shelf EQ Output Gain Mute Limiter
Metering
Stereo / Mono Formats
There is only one ‘standard’ layout of the processing blocks, but flexible routing and control linking allows this layout to
be adapted to a wide variety of applications.
There are two ‘Formats’, Mono or Stereo. With the Mono format, all outputs have unique parameter settings, and all
outputs are identical in terms of processing functions and routing capability. This is the most flexible Format.
Stereo format pairs the inputs and outputs for stereo operation, the parameters of each member of the pair being
identical. The routing of inputs to outputs is fixed. This format is intended for symmetrical stereo operation, eliminating
the need to make identical parameter adjustments for each channel.
The channel pairing is:
Left and Right Inputs
- Outputs 1 (routed from L input) and 3 (routed from R input) [1 and 4 for APG26]
- Outputs 2 (routed from L input) and 4 (routed from R input) [2 and 5 for APG26]
- Outputs 3 (routed from L input) and 6 (routed from R input) – [APG26 only]

DIGITAL MANAGEMENT SYSTEM DMS26 14
DSP processing - Input Channels
Gain
Knob A: Gain, adjustable in 0.2dB steps from –80 dB to +20dB
Delay
Knob A: Delay, adjustable in variable steps from 0 to 400ms
The delay parameter is adjustable in fine steps at low values; the adjustment becomes progressively coarser as the
value increases. The velocity sensitive Parameter Knobs therefore provide accurate setting of driver offset delays
(typically below 10ms) and rapid setting of longer system alignment delays.
High Pass Filter
Knob A: Frequency, out (off), 10.0Hz to 25.6kHz in variable steps
Knob B: high pass filter type

DIGITAL MANAGEMENT SYSTEM DMS26 15
System high pass filtering is provided for the input signal. This is the preferred location for high pass filtering as it affects
all outputs and can therefore improve inter-band phase relationships. Filter type is selectable from 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 its’ order as the filter becomes progressively steeper rather than following
a linear slope so a dB/octave description is not accurate.
Parametric Equalisation
Eight sections of equalisation are provided, two shelving filters and six fully variable parametric sections.
High and Low shelving filters
Knob A: Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B: Slope, 6 to 12dB / octave in 1dB steps
Knob C: Gain, +/-15dB in 0.2dB steps
The frequency is specified as point where the filter deviates by 3dB from the gain value.
Parametric filters
Knob A : Centre Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B : Width, display selectable, Q or BW (Bandwidth)
BW adjustable from 0.05 to 5 octaves in variable steps
Q adjustable from 14.2 to 0.2 in variable steps
Knob C : Gain, +/-15dB in 0.2dB steps

DIGITAL MANAGEMENT SYSTEM DMS26 16
Output Channels
Gain and Polarity
Knob A: Gain, adjustable in 0.2dB steps from –80 dB to +20dB
Knob B: Polarity, selectable, normal or reversed with reference to other outputs
Delay
Knob A: Adjustable in variable steps from 0 to 80ms
As for input delay, velocity sensitive Parameter Knobs provide finer adjustment at low levels and rapid selection of higher
values.
High and Low Pass Filters
Knob A: Frequency, <<out, 10.0Hz to 25.6kHz, out>>
Knob B: high pass filter type

DIGITAL MANAGEMENT SYSTEM DMS26 17
Filter type is selectable from Butterworth, Bessel, Linkwitz-Riley and Hardman. 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 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.
Parametric Equalisation
Eight sections of equalisation are provided in a similar format to the input channel equalisation; two shelving filters and
six parametric
Knob A: Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B: Slope, 6 to 12dB / octave in 1dB steps
Knob C: Gain, +/-15dB in 0.2dB steps
The frequency is specified as point where the filter deviates by 3dB from the gain value.
Knob A : Centre Frequency, 10.0Hz to 25.6kHz in variable steps
Knob B : Width, display selectable, Q or BW (Bandwidth)
BW adjustable from 0.05 to 5 octaves in variable steps
Q adjustable from 14.2 to 0.2 in variable steps
Knob C : Gain, +/-15dB in 0.2dB steps

DIGITAL MANAGEMENT SYSTEM DMS26 18
Limiters
Knob A : Threshold, -40dBu to 20dBu in 0.2dB steps
A high performance, low distortion limiter is provided on each output. Threshold is user adjustable; all other parameters
are carefully calculated dependant on configuration to provide clean and effective control of signal dynamics.
Routing
Knob A: Output source, selectable; Input A, Input B or Sum A+B
Configures the routing from input to output. This function is only available in mono format Presets.