XTA DP224 and DP226 Rental Manual

XTA DP224 and DP226 Rental Manual
DP226 Quick Reference
Accessing channels: press channel’s GAIN button.
First press accesses that channel’s gain. To scroll
through a channels 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 using the ENTER key. This applies
to all levels of menu. ENTER always confirms
selections.
The Menus and their Contents
Input Memory Sub-menu: Used for storage and
recall of input EQ, gain and delay. Also used for storage
and recall of complete input memory sets using a PC
card.
Input Setup Sub-menu: Used for ganging input EQ
and globally flattening all input EQ.
X-over Sub-menu: Used for storage and recall of
crossovers, including format, output EQ, output delay,
output gain, and limiter settings. Also used for design of
new crossovers.
Security Sub-menu: Used for locking various
features of the units, using a four digit code.
System Sub-menu: Used to view the units status,
and select various global options such as parametric EQ
‘Q’ or bandwidth units, and output meter monitoring
point (pre or post mute).
Remote GPI Sub-menu: Used to configure the
General Purpose Interface card (if fitted) for remote
recall of memories using contact closure.
Notes
The crossover or output settings are stored and recalled
independently (using store/recall a X-Over) from the input settings
(using store/recall input memory).
The output meters show level, in dB, from the limiter threshold.
The input meters show level, in dB, from input clip.
The high and low-pass filters are defined independently on each
channel.
To access the limiter attack and release parameters, select ‘Auto
Limiter TC’ No, when designing a crossover.
To swap parametric filter units between bandwidth (‘BW’) and ‘Q’,
enter the ‘System sub-menu, select ‘Filter Q or BW’, and select
required readout units.
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DP224/6 Operators Manual
Contents
DP226 Quick Reference
1
The Menus and their Contents
Notes
2
2
Contents
3
Important Safety Information
6
Thanks
7
Unpacking the DP226
7
Introduction
8
Features
8
Front Panel Familiarisation
10
Rear Panel Connections
11
Operating the DP226
Note about operation with
Preliminary Set-up
12
WindowsTM software.
12
12
DP226 Configurations
13
Introduction
2 x 2 way with Mono Sum
2 x 3 way
4 way + 2
5 way + 1
6 way
13
13
14
15
16
17
Screen Layouts Overview
18
Audio Function Screens
19
Gain Screen
Polarity Screen
Delay Screen
High and Low Pass Filter Screens
Parametric Equaliser Screen
Limiter Screen
DP224/6 Operators Manual
19
20
21
22
23
24
Page 3
Menu Selection
25
Input Memory Sub-menu
26
Input Memory Recall
Input Memory Store
Input Memory Store to PC card
Input Memory Recall from PC card
Input Memory Erase
26
26
26
26
26
Input Setup Sub-menu
27
Gang Inputs
All PEQ’s Flat
27
27
X-over Sub-Menu
28
Load a Xover
Design a Xover
Store a Xover
Erase a Xover Mem
28
28
28
28
Security Sub-Menu
29
User Specific
Xover Only
Xover + Trim
Xover + Trim + Mute
Changes Only
Changes + View
Changes + Mutes
EVERYTHING
Entering the Password to Complete the Locking Operation
29
29
29
29
29
29
29
29
30
System Sub-Menu
31
Interface Sub-Menu
33
AES / EBU Sub-Menu
35
Routing Options
AES Diagnostics
AES / EBU Connections
35
35
35
System Status
LCD Contrast
LED Brightness
Temperature Alarm
Program Update
Wake-up Time
Output Meters
Filter Q or BW
Delay Time/Distance
Unit Cloning
Preset Update
Clip Hold Time
31
31
31
31
31
31
31
31
31
31
32
32
Interface Setup
Interface Operation
Single Unit System
Multiple Unit System
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33
33
33
34
DP224/6 Operators Manual
Remote GPI Sub-Menu
36
Typical Interface Set-ups
37
RS232 Connection (Single Unit)
RS232 Connection (Multiple Units)
RS485 Connection
Midi Connection
37
37
38
38
Operating Notes
39
Operating Level
Grounding
Crossover Filter Slopes
Time Alignment
Output Limiters
Setting Accurate Limiter Thresholds
39
39
40
40
41
42
Specifications
44
Warranty
45
Options and Accessories
45
Appendices
46
Appendix 1: Limiter threshold in dB to Vrms lookup table.
Appendix 2: Default X-over settings and names for all formats.
Appendix 3: Equalisation Curves
Appendix 4: Frequently Asked Questions
Appendix 5: Additional Information: General Purpose Interface
Appendix 6: DP224 Crossover Configurations
DP224/6 Operators Manual
46
47
48
50
52
58
Page 5
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):
RF Immunity (EU):
Electrical Safety (EU):
EN55013-1 (1996)
EN55103-2 (1996) RF Immunity, ESD, Burst Transient,
Surge, Dips &Dwells
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 OR MOISTURE
ATTENTION
RISQUE DE CHOC ELECTRIQUE
NE PAS ENLEVER
NE PAS EXPOSER A LA PLUIE NI A L’HUMITE
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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DP224/6 Operators Manual
Thanks
Thank you for choosing the XTA DP226 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 DP226
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.
DP224/6 Operators Manual
Page 7
Introduction
The DP226 is a powerful DSP based audio processor, ideally suited for live sound
applications, where it combines the functions of a multitude of conventional products
in a compact 1U unit. To achieve this, the DP226 has two inputs and six outputs
which can be configured in five basic crossover modes – 3 x 2 way; 2 x 3 way; 4 way;
5 way; and 6 way.
Each input has a gain control, variable delay and eight bands of fully parametric
equalisation. Each output has a gain control, variable delay, high and low pass filters,
five bands of fully parametric equalisation, polarity switching and, additionally, a fully
featured limiter.
Remote control is catered for in the form of MIDI, RS232 and RS485 ports, and
multiple user memories are provided for the storage and recall of settings.. Multipart security lock-out is available for all controls.
The DP226 is also available with optional AES/EBU digital inputs and outputs.
It has been designed for quick, intuitive adjustment through the use of multiple
controls to provide an easy-to-use interface. Alternatively, it may be controlled
externally by XTA’s proprietary
WindowsTM software, along with
existing and future ‘Audiocore’
products.
Features
♦ Superb audio quality – carefully optimised double precision signal processing
coupled with a 40-bit internal data path ensures a dynamic range in excess of
110dB. The high sampling rate means minimal filtering providing exceptional
sonic purity.
♦ A flexible 2-input/6-output multi-mode format caters for any crossover
configuration, regardless of scale.
♦ A total of 46 parametric equalisation bands are available, each providing +15
to –30dB of gain at centre frequencies between 20Hz and 20kHz, with a wide
range of ‘Q’s available between 0.4 to 128. All parameters feature fine
resolution with 1/36 octave frequency steps, 0.1dB gain increments, and 100
‘Q’ settings. Any parametric section can also be set to operate as a high or
low shelving filter.
♦ Each output features a high performance limiter, provided with complete
control over attack, release and threshold parameters. To aid set-up, the
output meters show headroom to the limiter threshold, and use time
constants that track those of the limiter to display precise power usage.
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DP224/6 Operators Manual
♦ Each output features variable high and low pass filters, with a choice of 12, 18
or 24dB/Octave roll-off, and Butterworth, Bessel or Linkwitz-Riley responses.
Independent control of each high and low pass filter allows asymmetric
crossover bands to be created.
♦ Delay of up to 650mS may be independently set for each output, with an
exceptionally fine minimum increment of 2.6µS.
♦ Three velocity-sensitive encoders provide a familiar and intuitive control
format with all filter information displayed simultaneously on a backlit LCD
screen.
♦ The comprehensive standard specification also includes 40 memories, PC
Card storage and remote control via MIDI, RS232 or RS485 ports, with multipart security lock-out.
♦ AES/EBU Digital input and output interfaces are available as an option.
♦ Input and output balancing transformers are also available as an option.
DP224/6 Operators Manual
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Front Panel Familiarisation
LCD Screen : shows menu options,
channel information, and various
parameters as they are adjusted.
Next Key : moves forwards through the list of available parameters.
Back Key : moves back through the list of available parameters.
Menu Key : activates the main menu. A second press selects the last
menu edited. Selection of different menus may be accomplished using
the Back and Next keys, or by turning the ‘Freq’ encoder.
Enter Key : enters the chosen menu and confirms choices.
Bypass Key : bypasses the currently selected parametric EQ section. Note that,
for safety reasons, the high and low pass filters cannot be bypassed using this key.
Quit Key : exits the menu.
Encoders : three velocity sensitive controls allow the
relative parameter displayed on the LCD screen to be
adjusted.
PC Card : PCMCIA card slot allows back-up of input
memory sets, unit cloning data and facilitates the download of
software updates.
Gain Keys : one for each input and output, allowing instant access
to the gain screen for the selected channel. The accompanying LED
illuminates whilst editing is active.
Input Meters : display available headroom below clipping. The
yellow ‘0dB’ LED illuminates at 3dB below the actual clipping point
of the input section. The red ‘D.Clip’ LED shows digital overflow and can therefore
illuminate independently of the rest of the meter.
Output Meters: display headroom below limiting. The yellow
LED illuminates when the limit threshold is reached for that
channel. The red LED indicates 4dB of limiting.
Mute Keys: mutes the appropriate channel, and illuminates the
associated LED.
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DP224/6 Operators Manual
Rear Panel Connections
Power Switch:
turns the units 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.
External: 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.
Midi IN: 5 pin DIN socket. See page 33 for more
information.
RS485 In-Out: XLR sockets. Used for transmission of
remote control data over long distance or multiple unit
applications. See page 33 for more information.
Audio In-Out: 3 pin XLR sockets are provided for each
channel. All are fully balanced, pin 2 hot, 3 cold, 1
screen.
Always replace the fuse with the correct type and rating as
shown on the rear panel legend.
DP224/6 Operators Manual
Page 11
Operating the DP226
Note about operation with
WindowsTM software.
The following operating information covers control of the DP226 via the front panel
controls only. Please consult the manual supplied with this software for information
regarding computer control.
Preliminary Set-up
The procedure below should be followed when first installing a DP226.
Design your crossover! To do this, press MENU, and use the BACK or NEXT
key to select ‘X-over sub-menu’ and then press ENTER. Use the BACK or
NEXT key to select ‘Design a X-over’ and then press ENTER. Finally, use the
BACK or NEXT key to select the desired configuration and 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 GAIN 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. See appendix 2 for more information.
Use the GAIN 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.
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DP224/6 Operators Manual
DP226 Configurations
Introduction
To simplify the set-up of the DP226, 5 crossover modes are selectable from the Xover sub-menu. These all have parametric equalisers, high and low pass filters, gain
controls, delay and limiters. The following set of diagrams detail how each of the five
modes is internally configured. Note that the 2 x 3 way and 3 x 2 way modes also
offer the option of ganged parameter adjustment for stereo systems.
2 x 2 way with Mono Sum
This format feeds input A to outputs 1 and 2, designated low and high respectively.
Input B feeds outputs 3 and 4, low and high respectively. Outputs 5 and 6 are both
fed from the sum of inputs A and B. Output 6 is a full bandwidth output by default,
with output 5 being bandwidth limited as a sub output. The choice of whether this
summed signal is pre or post input EQ is made during the selection of this crossover
configuration. It can be modified by entering the ‘Design a Xover’ function again.
Any changes made to the crossover points or EQ will not be affected by swapping
from pre to post or vice versa.
DP224/6 Operators Manual
Page 13
2 x 3 way
This format feeds input A to outputs 1, 2, and 3 designated low, mid, and high
respectively. Input B feeds outputs 4, 5, and 6, as low, mid, and high respectively.
Note that this configuration, as with the 2 x 2 way, can have the outputs ganged for
stereo operation. This gangs outputs 1 & 4, 2 & 5, and 3 & 6, so that they track
identically. It can be selected or modified by entering the ‘Design a Xover’ function
again. Any changes made to the crossover points or EQ will not be affected by
swapping from pre to post or vice versa.
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DP224/6 Operators Manual
4 way + 2
This format feeds input A to outputs 1, 2, 3, and 4 designated low, lo-mid, hi-mid and
high respectively. Outputs 5 and 6 are configured as auxiliaries, with their source
being either input B, or the sum or inputs A and B. The choice of pre or post input
EQ for the sum signal is only offered if outputs 5 and/or 6 are chosen to feed form
the sum. This configuration also allows all the input EQ to be moved to input A,
giving 16 bands of fully parametric EQ. If there does not appear to be any EQ on
input B, this will be why.
DP224/6 Operators Manual
Page 15
5 way + 1
This format feeds input A to outputs 1, 2, 3, 4, and 5 designated sub, low, lo-mid, himid and high respectively. Output 6 is configured as an auxiliary, with the source
being either input B, or the sum or inputs A and B. The choice of pre or post input
EQ for the sum signal is only offered if output 6 is chosen to feed form the sum. This
configuration also allows all the input EQ to be moved to input A, giving 16 bands of
fully parametric EQ. If there does not appear to be any EQ on input B, this will be
why.
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DP224/6 Operators Manual
6 way
This format feeds input A to all outputs designated lo-sub, through high, 1 to 6
respectively. This configuration also allows all the input EQ to be moved to input A,
giving 16 bands of fully parametric EQ. If there does not appear to be any EQ on
input B, this will be why.
Note for DP224 Owners: Having four outputs instead of six, the
DP224 does not support the same configurations as the DP226.
The configurations available for the DP224 are given in Appendix 6,
starting on page 58. These configurations have been specially designed to facilitate
the use of a DP224 as either half of a stereo 4-way system, or for use on monitors.
DP224/6 Operators Manual
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Screen Layouts Overview
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DP224/6 Operators Manual
Audio Function Screens
Gain Screen
To adjust the gain:
Use the ‘GAIN’ control.
Each input and output has an individual gain screen. The inputs have a range of +6dB
to –40dB, adjustable in 0.1dB steps and the outputs have a range of +15dB to –
40dB, again adjustable in 0.1dB steps.
For further details on this topic, see the section entitled
“Operating Level” on page 39.
DP224/6 Operators Manual
Page 19
Polarity Screen
To adjust the polarity:
Use the ‘GAIN’ control to switch between + and -.
Each output has an independent polarity screen. This gives the flexibility to reverse
(flip by 180°) the phase of individual outputs.
Note: When the outputs are ganged, the polarity screens remain
individual.
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DP224/6 Operators Manual
Delay Screen
To adjust delay settings:
Use the ‘FREQ’ control for coarse control. (1mS steps)
Use the ‘Q’ control for fine control. (2.6µS steps)
Each input and output has an independent delay time control. Input delay (base delay)
is adjustable in 1mS steps. Output delay is adjustable in 2.6µS steps or in 1mS steps
giving complete control over driver time alignment.
The combination of input (base) delay and output delay can be a maximum of 650mS.
So, for example, setting a base delay of 500mS on input A will only leave 150mS for
any outputs that are sourced from input A. The exception to this rule is for any ‘aux’
outputs (available in 4 and 5 way crossover modes). Choosing the source as a mono
sum (Inputs A + B) will allow 650mS of output delay, regardless of the input delay
settings.
For further details on this topic, see the section entitled
“Time Alignment” on page 40.
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High and Low Pass Filter Screens
To adjust HPF/LPF settings:
Use the ‘FREQ’ control for the frequency.
Use the ‘Q’ control for the slope.
Each output has an independent high pass filter and an independent low pass filter.
Both filters have a range of selectable slopes, which are Bessel 12dB, 18dB and 24dB,
Butterworth 12dB, 18dB and 24dB, and Linkwitz-Riley 24dB.
Highpass filters have a range of <10Hz (through) to 16kHz and Lowpass filters have a
range of 22kHz (through) to 39Hz in 1/36 octave steps.
HPFs and LPFs can be set asymmetrically.
For further details on this topic, see the section entitled
“Crossover Filter Slopes” on page 40.
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DP224/6 Operators Manual
Parametric Equaliser Screen
To adjust parametric settings:
Use the ‘FREQ’ control for the frequency.
Use the ‘Q’ control for the Q.
Use the ‘GAIN’ control for the gain.
Each parametric section can be positioned at a frequency from 20Hz to 20kHz and
features a wide range of 'Q’s to produce response curves ranging from broad to
notch. The gain control ranges from +15dB to -30dB in 0.1dB steps. Frequency steps
are 1/36 octave resolution for precise control. Since all filtering is achieved in DSP all
settings are re-settable with absolute accuracy and in ganged mode parameters track
identically. Very narrow band notch filters (maximum ‘Q’ of 128) can be achieved and
unlike analogue filters these tight ‘Q’ filters are entirely stable. The maximum notch
depth is -30dB.
Parametric filters are carefully implemented using Double Precision processing. This
method is costly in terms of processing power but yields substantial benefits in terms
of the DP226's exceptional noise performance and greatly improved low frequency
stability.
(Note: To show parametric filters in bandwidth (BW) rather than ‘Q’, go into the
‘System sub-menu’, select ’filter Q or BW’, select BW.)
To switch a filter from parametric mode to shelving mode, set the gain of the filter to
0dB and then turn the ‘Q’ control anti-clockwise until ‘HiSHF’ or ‘LoSHF’ is displayed.
Now set the frequency and gain as required. To set the filter back to a parametric
section, just ensure that the gain is at 0dB, otherwise the ‘Q’ control will have no
effect.
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Limiter Screen
To adjust limiter settings:
Use the ‘FREQ’ control to adjust the attack time.
Use the ’Q’ control for the release time.
Use the ‘GAIN’ control for the limiter threshold.
Each output has an independent high performance limiter.
All limiters have an attack range of 0.3mS to 90mS, release times are 2, 4, 8, 16 and
32 times the attack time and thresholds range from +22dB to –10dB in 1dB steps.
If the automatic limiter time constant option is in use, all limiter screens will say
‘automatic’ and the time constants will be set from the high pass filter frequency. A
table of dB to Vrms, in case the amplifier sensitivity is given in Volts rather than dB, is
in appendix 1.
The output meters are linked to the time constants of the limiters so true output
metering is achieved.
For further details on this topic, see the section entitled
“Output Limiters” on page 41.
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DP224/6 Operators Manual
Menu Selection
The following menu selections are available:
Input Memory Sub-menu:
Memory Recall – recalls input EQ, input gain, input ganging and base delay.
Memory Store – stores the above selection of parameters for inputs.
Store to PC Card – stores all the input memories to a PC card as a set.
Recall from PC Card – recalls a complete set of input memories from a card.
Memory Erase – erase an individual input memory.
Input Set-up Sub-menu:
Gang Inputs - Allows ganging of inputs for stereo operation.
All PEQ’s Flat – Sets all input parametric sections back to default values.
Xover Sub-menu:
Load a Xover – loads a pre-defined crossover.
Design a Xover – starts the set-up wizard for designing a new crossover.
Store a Xover – stores all output settings as a defined crossover.
Erase a Xover Mem. – erase an individual crossover memory.
Security Sub-menu:
Locks the unit with a 4 digit code, at one of many user definable levels.
DO NOT ENTER THIS MENU BEFORE HAVING THOROUGHLY UNDERSTOOD THE
WAY THE LOCK-OUT WORKS, AS DESCRIBED ON PAGE 29.
System Sub-menu:
System Status – displays unit-specific info, such as version and internal
temperature.
LCD Contrast – adjusts the contrast of the LCD screen.
LED Brightness – adjusts the brightness of all indicator LEDs.
Temperature Alarm – sets a temperature warning threshold in °C.
Program Update – loads a new version of software from a PC card.
Wake-up Time – sets time take for unit to pass audio after power-up.
Output Meters – selects whether meters are monitoring pre or post mute.
Filter Q or BW – selects display type for parametric filter screens.
Delay Time/Distance – select units to display delays in (mS/m/ft)
Unit Cloning – stores and recalls clone information on PC cards.
Clip Hold Time – adjust how long the internal clip warning LEDs are held
Interface Sub-menu:
Interface Setup – starts a wizard for interface control and relay to ‘slave’ units.
AES/EBU Sub-menu:
Routing Options – select various routing options.
AES Diagnostics – shows complete status of AES signal.
(Only available if the AES/EBU option is fitted.)
DP224/6 Operators Manual
Page 25
Input Memory Sub-menu
Input Memory Recall
Press MENU and select the ‘Input Memory Sub-menu’ then ‘Memory Recall’ using the
BACK, NEXT and ENTER keys. When the menu is entered, the last recalled memory
will be displayed first. Use BACK and NEXT to view the other input memories and
press ENTER to load selection. If after 15 seconds no recall has been implemented,
the unit will return to the default mode.
The name of the last memory recalled will be displayed on the bottom line of the
default screen under the crossover name. A ‘#’ will be displayed next to the
memory name when any input parameter is adjusted after a memory has been
recalled. This is to show the original settings have been modified.
Input Memory Store
To store input settings to a location from the 40 user-selectable memories press
MENU and select the ‘Input Memory Sub-menu’ then ‘Memory Store’ using the
BACK, NEXT and ENTER keys. Select memory number to store to and then name
the memory as appropriate by using the FREQ control to select a character and
BACK and ‘NEXT to move to the next character.
(N.B. This sequence must be completed for a memory to store. If after 15 seconds
no store has been implemented, the unit will return to the default mode.)
When storing a memory the LCD shows the next available empty memory
automatically, but any memory number can be chosen and any memory can be over
written. Previously used memories are identified by a '?' question mark.
Input Memory Store to PC card
To store all input memories to PC card press MENU and select the ‘Input Memory
Sub-menu’ then ‘Store to PC Card’ using the BACK, NEXT and ENTER keys. Name
the memory set as appropriate by using the FREQ control to select a character and
BACK and NEXT to move to the next character.
(N.B. This function stores all input memories as a set.)
Input Memory Recall from PC card
To recall an input memory set from PC card press MENU and select the ‘Input
Memory Sub-menu’ then ‘Recall From PC Card’. Using the BACK, NEXT and ENTER
keys select one of stored memory sets.
Note: Recalling a memory set will overwrite memories
already stored in the unit. – a memory set is all 40 input
memories stored together.
Input Memory Erase
To erase an input memory p ress MENU and select the ‘Input Memory Sub-menu’
then ‘Memory Erase’. Using the BACK, NEXT and ENTER keys select one of stored
input memories, and press ‘ENTER’ twice (confirmation is required) to erase.
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DP224/6 Operators Manual
Input Setup Sub-menu
There are two options in this menu, where applicable, which are:
Gang Inputs
Gangs A and B inputs so that precise adjustments can be made to both inputs
simultaneously. Both GAIN LEDs will light when the inputs are accessed and the LCD
will show A+B. All adjustments are now absolute and any adjusted parameters on
both channels will become identical . If it is necessary to introduce an off-set on any
parameter, un-gang the inputs, and adjust. If re-ganged, channel B will jump to
channel A’s setting.
All PEQ’s Flat
Resets all input parametric equalisation filters to 1k00Hz, Q=3.0 and 0.0dB.
DP224/6 Operators Manual
Page 27
X-over Sub-Menu
Load a Xover
Loads a stored crossover from the selection available. Enter accepts the selected
name and loads immediately.
Design a Xover
Opens a wizard to design a crossover. Options include format type, ganging of
outputs, routing and automatic limiter time constants. The table below outlines
which options are available dependant on what type of crossover is chosen for the
design.
2 x 2 Way
A+B:Pre/Post In. EQ
Gang Outputs:Yes/No
Auto Limit TC:Yes/No
2 x 3 Way
Gang Outputs:Yes/No
Auto Limit TC:Yes/No
4 Way
Out 5 Source:A/A+B
Out 6 Source:A/A+B
Input A EQ:8/16 Band
A+B:Pre/Post In. EQ
Auto Limit TC:Yes/No
5 Way
6 Way
Out 6 Source:A/A+B
Input A EQ:8/16 Band
Input A EQ:8/16 Band
Auto Limit TC:Yes/No
Auto Limit TC:Yes/No
Store a Xover
Stores a X-over (all output settings) to one of 9 locations. Crossovers can be named,
using the same method as memories, with up to 16 characters which appear in the
default screen on the top line of the display.
Erase a Xover Mem
Permits clearing (erasing) of individual crossover memories from the unit. Note that,
once erased, the memory name disappears form the list of recallable locations. If the
crossover memory is currently in use, it’s name will remain on the default screen, and
the current settings will not be changed.
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DP224/6 Operators Manual
Security Sub-Menu
After selecting the ‘Security Sub-Menu’ and pressing ENTER, select one of the lock
types, after choosing the most appropriate one for your application. As ever, ENTER
will confirm your selection.
User Specific
Upon pressing ENTER to select this type of lock, each parameter group is presented
in turn. Choose the type of lock (as above) using the FREQ encoder, and press
ENTER to confirm each parameter. After the last parameter, the unit requests a
password. The description of this operation is given at the end of this section.
This option allows the user to specify, for each type of parameter, whether it is to be
completely accessible (‘No Lock’), viewable but not adjustable (‘Control’), or
effectively unavailable (‘Display’). The ability to operate mutes, store or recall
memories, or even access the menus may also be locked.
Xover Only
All input parameters are available, but only the gain trim is available on the outputs,
effectively locking all the crossover settings. All mutes remain active.
Xover + Trim
All input parameters available, but no output parameters – the crossover sections are
completely locked. All mutes remain active.
Xover + Trim + Mute
As for ‘Xover + Trim’ but additionally, output mutes are locked. Input mutes remain
active.
Changes Only
All parameters may be viewed, but none may be adjusted. This apples to both inputs
and outputs. All mutes remain active.
Changes + View
No parameters are accessible – in effect the GAIN keys do nothing. All mutes remain
active.
Changes + Mutes
All parameters may be viewed, but none may be adjusted. This apples to both inputs
and outputs. All mutes are also locked.
EVERYTHING
No parameters are accessible – in effect the GAIN and MUTE keys do nothing.
DP224/6 Operators Manual
Page 29
Entering the Password to Complete the Locking Operation
After selection of the lock type from the list above, a four-digit security code will be
asked for. This can be entered by using the ‘FREQ’ control to select a character, and
the ‘BACK’ and ‘NEXT’ keys to move to the next character.
Alternatively, the ‘GAIN’ keys can be used to enter a code by pressing any
combination of the eight buttons. Each ‘GAIN’ key represents its channel labelling, so
any combination of A, B, 1, 2, 3, 4, 5 and 6 can be used as a code, as shown below.
IMPORTANT - Please note your code! If the security code number
is forgotten contact your local XTA sales office.
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DP224/6 Operators Manual
System Sub-Menu
System Status
Displays unit information including software version and temperature.
Curr. Temp. = current temperature in degrees Celsius.
Max1. Temp. = maximum temperature this session.
Max2. Temp. = maximum temperature ever reached.
LCD Contrast
Adjusts the LCD contrast from 0 to 100.
LED Brightness
Adjusts the LED brightness from 1 to 15.
Temperature Alarm
Sets a temperature warning between 20 and 80°C. The default screen will flash
‘ALARM. Temp = n°C’ when the specified temperature is reached. (N.B. the warning
does not affect the units’ performance in any respect.)
Program Update
Loads a new version of software from a PC card. Updating the software will not
affect any user memories stored in the unit.
Wake-up Time
Sets how the unit starts up with one of the following options.
0 to 60 seconds: Waits the specified time before unit wakes up.
Mute hold: Turns on and holds all output mutes when turned on.
(N.B. Wake-up is a slow ramp in level for about 5 seconds.)
Output Meters
Selects whether the output meters are pre or post mute. If the meters are set to
read pre-mute, they will still show the level, even if the channel has been muted.
Filter Q or BW
Selects whether ‘Q’ or Bandwidth is displayed in the parametric screens.
Delay Time/Distance
Selects whether delay is displayed in milliseconds, metres, or feet.
Unit Cloning
This option allows a unit to be completely ‘backed up’ or ‘restored’ to another unit.
Selects store or recall ‘clone’ data using a PC card. Cloning stores all input memories
(40), all user crossovers (9) and all menu options to the PC card.
DP224/6 Operators Manual
Page 31
Preset Update
This option allows new preset crossover configurations to be uploaded into the unit
via a PCMCIA card. Preset configurations are accessible from memory number ten
(10) and beyond, in the ‘Load a Xover’ menu option. They may be recalled and
edited (if the preset configuration allows editing), but may not be re-saved over the
same location. If a modified preset is to be saved , it will have to exist in one of the
first nine (9) locations.
Clip Hold Time
If the unit has an excessive amount of equalisation anywhere in the signal path, it is
possible that the digital signal processors will run out of headroom and internal
clipping may occur. This can happen even when the input level appears to be
relatively low. Internal clipping is shown by the two red ‘D. CLIP’ LEDs on the input
meters illuminating together. They can light independently of the rest of the meter,
so that the input level might just light the –12dB LED, but due to internal EQ settings,
clipping has occurred.
The time that the LEDs remain illuminated after the condition has passed is set using
this parameter, from 0.1 seconds, up to 1.0 second.
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DP224/6 Operators Manual
Interface Sub-Menu
Interface Setup
Opens a wizard to configure the remote interface. Options include master/slave,
master source, baud rate (RS232/485), MIDI relay and remote ID No.
Interface Operation
The DP226 has as standard three external interface systems MIDI, RS232 and RS485.
This allows complete control over the DP226 via computer (cable or radio) and MIDI
‘Program Change’ command. Setting up the Interface depends on whether the unit is
in a single unit system or a multiple unit system.
Single Unit System
Select the following options in the Interface Setup menu:
Extern: Master.
Master Source : RS485 , RS232 or MIDI (Select the Interface you wish to use.)
If ‘Master Source’ is ‘RS485’ or ‘RS232’, the following option will appear.
MIDI Relay: ‘No’ or ‘Yes’. If you wish the unit to simultaneously accept MIDI
‘Program Change’ commands select ‘Yes’.
If MIDI Relay is ‘Yes’ the following option will appear.
MIDI Channel: 1-15 + Omni (select the required MIDI channel for the ‘Program
Change’ command.)
If ‘Master Source’ is ‘RS485’ or ‘RS232’, the following option will appear.
RS232/485 Baud: 2400, 4800, 9600, 19200, 38400 (Select the baud rate, this should
correspond to the baud rate set on the computer.)
If ‘Master Source’ is ‘RS232’, the following option will appear.
RS485 Baud: 38400 (Select this baud rate).
Remote ID Num = 1-32 (Select the ID number, normally 1 for single unit
operation. This should correspond to the ID number in the
software.)
DP224/6 Operators Manual
Page 33
Multiple Unit System
For multiple unit systems one unit is set as a master, this is the unit connected to the
computer and or the MIDI controller. This unit should be set-up as for a single unit
system. The remaining units should be set as slaves and connected via RS485 XLR
connectors in a chain to the master unit.
Select the following options in the Interface Setup menu:
Extern: Slave.
RS485 Baud: 2400, 4800, 9600, 19200, 38400 (Select the same as the RS485 baud
rate set on the master unit).
Remote ID Num = 1-32 (Select the ID number, this should correspond to the ID
number for the relevant unit in the
software.)
Note that, if the unit is set to operate as a slave, as additional set of remote ID
numbers become available – these are the ‘shadow’ ID numbers and allow two units
to share the same ID number, effectively operating as identical copies of each other.
For example if the remote ID is set to be ‘1s’ (available one click above ID number
32) then any changes made to the unit set to ID 1 will also be applied to this unit.
Units with ID’s set as ‘shadows’ will not appear in the unit list when AudioCore scans
for available units.
(For more in-depth information on typical interface setups, see page 36.)
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DP224/6 Operators Manual
AES / EBU Sub-Menu
Connection of AES/EBU signals is via the existing rear panel XLR connectors.
With the AES/EBU option fitted, AES Receive and Diagnostic modes are provided.
Routing Options
Selects the input source – either analogue or digital, and similarly the output source,
again either analogue or digital.
AES Diagnostics
Reports validity flag, clock speed and errors present in the incoming AES digital signal.
AES / EBU Connections
The AES/EBU digital signal is a stereo data stream, and so only one input XLR and
three output XLRs are used for the digital interface.
The connections are as follows:
Input A Input B -
Analogue Input at all times
Switchable between digital (stereo) input and analogue input
Output 1 Output 2 Output 3 -
Switchable between digital out (for channels 1 & 2) and analogue out 1
Switchable between digital out (for channels 3 & 4) and analogue out 2
Switchable between digital out (for channels 5 & 6) and analogue out 3
Output 4 Output 5 Output 6 -
Analogue output 4 only
Analogue output 5 only
Analogue output 6 only
DP224/6 Operators Manual
Page 35
Remote GPI Sub-Menu
In certain circumstances the connection of a computer to a DP226 is both impossible
and undesirable, perhaps for reasons of unnecessary complexity and cost.
This is where the general purpose interface option becomes useful. It permits the
recalling of memories (input, crossover, or both) from a remote location, without the
need for expensive interface controllers. Memories may be recalled using a simple
wired interface.
The configuration and set-up of the interface is covered in Appendix 5 on page 52, as
it is an option that is not fitted as standard.
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DP224/6 Operators Manual
Typical Interface Set-ups
RS232 Connection (Single Unit)
A typical interface set-up might involve running an RS232 link from laptop or a
desktop computer to a DP226 set up as a master unit. The diagram below shows this
method of connection, the required menu options are also given. Note that the
RS232 cable must be a 1-1 connection type, NOT a null modem cable (which has
connections crossed internally).
RS232 Connection (Multiple Units)
If control over multiple units is required, typically the slaves will be set up to run from
the RS485 ports on the master DP226. Note the incremental ‘Remote ID Num’
option in the unit’s menu options.
DP224/6 Operators Manual
Page 37
RS485 Connection
To use RS485 communication directly from a computer, a master DP226 must be
configured to receive RS485. You must have a suitable RS485 port on your computer,
or a converter connected to the serial port in use. This configuration is shown below,
along with the required menu options.
Midi Connection
To use MIDI communications, the DP226 must be configured to receive as a master
via its MIDI port. You must have a MIDI card or interface connected to your
computer. The setup is shown below.
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DP224/6 Operators Manual
Operating Notes
Operating Level
With any audio signal processing equipment it is necessary to ensure adequate signal
level is used through the device, to avoid sacrificing noise performance. It is suggested
that the operating level chosen should give adequate level to just light the -12dB LED
on the headroom meter with maximum program level being used. Since the meter is
deliberately set to show clipping 3dB early, this still provides 9dB of headroom before
clipping occurs. With equalisation in use it may be necessary to further reduce the
input level, as gain within the unit may cause digital clipping, indicated by the top red
LED's lighting independently of the rest of the meter.
It should be noted that the figure quoted for the maximum input level options is the
clipping point for that option (not a safe operating level). Always ensure that this
clipping point is no lower than that for the following equipment in the signal chain,
and allow extra margin if equalisation sections are boosted.
Grounding
The Screen (shield) pins on all audio connectors are normally connected directly to
the ground pin of the IEC mains inlet. The chassis is also directly connected to this
pin. Never operate this unit without the mains safety ground connected. Signal
ground (0V) is in turn connected to the chassis ground.
To avoid ground loops, cable shields should be connected to ground at one end only.
The normal convention is that the shield is only connected at the output XLR.
Provision is also made for separately isolating each input and output shield pin
permanently within the DP226 by breaking the appropriate PCB track, where
marked with a box and an arrow next to each XLR connector using a small drill bit or
cutter. See the following diagram for details.
XLR pin 1 Isolation points (arrowed) and 10dB pads (circled)
DP224/6 Operators Manual
Page 39
Crossover Filter Slopes
Please consult the block diagrams on page 13 for details of the various configurations
available. All crossover modes feature adjustable crossover frequencies with a choice
of slopes, 5 bands of driver compensation E.Q. per output and delay time plus
limiters for each output. A powerful 8 band parametric equaliser is also provided on
each input for room equalisation. Phase reverse is provided for each output.
A choice of Bessel or Butterworth slopes at 12/18/24dB per octave and LinkwitzRiley at 24dB per octave are provided. Since Low and High pass functions are
separately adjusted, asymmetric slopes are easily achieved, if required. It should also
be noted that the turnover frequency displayed on the DP226 is the -3dB point for all
slopes except 24dB Linkwitz-Riley where the -6dB point is shown. If the -6dB point is
to be used for the Bessel or Butterworth filter, take the required crossover
frequency, multiply this by the appropriate factor from the following table and then
select the closest available frequency on the DP226's display.
Filter Type
High pass factors
Low pass factors
Bessel 12dB/Oct.
Butterworth 12dB/Oct.
Bessel 18dB/Oct.
Butterworth 18dB/Oct.
Bessel 24dB/Oct.
Butterworth 24dB/Oct.
1.45
1.31
1.37
1.19
1.35
1.15
0.69
0.76
0.73
0.84
0.74
0.87
Please note that unlike conventional analogue crossovers, crossover points and slopes
are set with absolute accuracy since component tolerance problems do not occur.
Time Alignment
A further advantage of the DP226 over conventional products is the provision of an
independently adjustable delay section for each output. This allows the true arrival
time from multiple drivers to precisely aligned rather than relying on the compromise
'phase adjust' approach. Delay time is adjustable in 2.6µS steps (1mm).
Please see page 21 for details of how to adjust the delay times.
To convert from units of time (i.e. milliseconds) to units of distance use the following
formula:
1 millisecond = 343mm (1.126ft) @ 20°C (68°F)
To calculate time delay for a known distance, use:
Time delay = Distance in meters
20.06 x √273+°C
where °C is the temperature in °C.
To simplify this equation at 20°C.
Delay time in milliseconds =
(Distance in meters x 2.192) or (Distance in feet x 0.955)
Note: Centigrade = (Fahrenheit –32) x 0.5555.
Page 40
DP224/6 Operators Manual
Output Limiters
High performance digital limiters are provided for each output with control over
attack time, release time and threshold level parameters - see page 24 for details.
This level of control allows the user to balance the required subjective quality of the
limiter against the driver protection requirements. It does also mean that an
incorrectly set limiter may sound awful! In particular, as with all limiters, using too fast
an attack or release time will result in excessive low frequency distortion. In the
‘Design a Xover’ sub-menu there is an option for automatic limiter time constants.
In this mode the time constants will be automatically set from the Highpass filter
frequency according to the table below.
The time constants are set by the high pass filter frequency for that channel.
High Pass Filter
<10Hz – 31Hz
Auto Attack Time
45mS
Release Time
x16 (720mS)
31Hz – 63Hz
16mS
x16 (256mS)
63Hz – 125Hz
8mS
x16 (128mS)
125Hz – 250Hz
4mS
x16 (64mS)
250Hz – 500Hz
2mS
x16 (32mS)
500Hz - 1kHz
1mS
x16 (16mS)
1kHz – 2kHz
0.5mS
x16 (8mS)
2kHz – 22kHz
0.3mS
x16 (4mS)
DP224/6 Operators Manual
Page 41
Setting Accurate Limiter Thresholds
The limiters built into the DP226 are intended to be used for for loudspeaker driver
protection, as opposed to amplifier protection. All modern professional power
amplifiers designed for live sound use have their own limiters which are tailored to
protecting the amplifier from clipping.
The following section describes how to set up the DP226’s limiters to provide
exceptional protection against driver overheating, and cone over-excursion.
Most speaker systems are given a power rating in Watts RMS. This is the maximum
continuous power that the system will handle and often appears very conservative. In
reality, as music program is far from continuous in nature, the peak power of the
system is much higher – up to ten times the continuous figure. Any limiter, which is
to protect the driver from damage, must be able to fulfil the following tasks.
•
•
•
Have an attack time which is calculated to allow transients through but keep
the RMS level below the speaker manufacturers specification;
Have a release time which is sufficiently long to avoid the limiter itself
modulating the program ;
Be intelligent enough to adjust the envelope of the limiter according to the
frequency content of the program material.
The DP226’s limiters are capable of performing all these tasks. The only parameter
which the user must set manually is the threshold, and it is crucial that this is done
correctly. Consider the table below.
dB
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
Ratio
177.83
158.49
141.25
125.89
112.20
100.00
89.13
79.43
70.79
63.10
56.23
50.12
44.67
39.81
35.48
31.62
Vrms
137.74
122.77
109.41
97.52
86.91
77.46
69.04
61.53
54.84
48.87
43.56
38.82
34.60
30.84
27.48
24.49
Pwr 8 Ω
2371.71
1883.91
1496.45
1188.67
944.19
750.00
595.75
473.22
375.89
298.58
237.17
188.39
149.64
118.87
94.42
75.00
Pwr 4 Ω
4743.42
3767.83
2992.89
2377.34
1888.39
1500.00
1191.49
946.44
751.78
597.16
474.34
376.78
299.29
237.73
188.84
150.00
Pwr 2 Ω
9486.83
7535.66
5985.79
4754.68
3776.78
3000.00
2382.98
1892.87
1503.56
1194.32
948.68
753.57
598.58
475.47
377.68
300.00
Using this table it is a straightforward procedure to work out the required setting of
the limiter thresholds for the system. Follow the steps described overleaf.
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DP224/6 Operators Manual
First, check the RMS power rating of the speaker system, and its impedance.
Look up this value in the table above, using the closest value below the rated
power of the speaker system. Note the corresponding ‘dB’ value.
Check the gain of your amplifier, which needs to be in ‘dB’.
Subtract this gain figure from the dB value obtained from the table to find the
required absolute setting for the limiter thresholds.
Note that, for safety, always set the limiter threshold 1 or 2 dB below the maximum
allowable worked out using the above method.
ALWAYS REFER TO YOUR SPEAKER MANUFACTURER FOR
LIMITER SETTINGS.
DP224/6 Operators Manual
Page 43
Specifications
Inputs: 2 electronically balanced
Impedance: > 10k ohms.
CMRR : >65dB 50Hz - 10kHz.
Outputs: 6 electronically balanced
Source Imp: < 60ohms
Min. Load: 600ohm
Max. Level: +20dBm into 600 ohm
Frequency Resp.:+½dB 20Hz-20kHz
Dyn Range:>110dB 20Hz-20k unwtd
Distortion:< .02%@1kHz,+18dBm
Maximum Delay: 650 mS
Min Step Size: 2.6 µS
Input Gain: +6dB to -40dB in 0.1dB
steps
Output Gain: +15dB to -40dB in
0.1dB steps and mute
Parametric Equalisation
8 per Input / 5 Sections per Output
Filter Gain: +15dB to -30dB in 0.1dB
steps.
Freq. Range: 20Hz - 20kHz, 1/36
octave steps. (368 positions)
Filter Q / BW: 0.4 to 128 / 2.5 to 0.008
(Sections switched to shelving
response)
Low frequency: 20Hz - 1kHz
High frequency: 1kHz - 20kHz
Shelf gains: ±15dB in 0.1dB steps.
High and Lowpass Filters
Filters: 1 of each per output.
Freq. Range HPF: 10Hz - 16kHz
1/36 octave steps.
Freq. Range LPF: 35Hz - 22kHz
1/36 octave steps.
Responses:
Bessel/Butterworth 12-18-24dB/Oct.
Linkwitz-Riley 24dB/Oct.
Limiters
Threshold: +22dBu to -10dBu
Attack time: 0.3 to 90 milliseconds
Release time: 2/4/8/16/32 x Attack
time
Display:2x20 character backlit LCD
Input meter: 2 x 6 point, -24dB to
digital clip.
Output meter: 6 x 6 point, -24dB to
+4dB into limit.
Connectors
Inputs: 3 pin female XLR
Outputs: 3 pin male XLR.
MIDI In: 5 pin DIN
External: 9 pin DEE connector (RS232)
RS485:3 pin male XLR (out) 3 pin male
XLR (in)
Power: 3 pin IEC
Power: 60 to 250V ±15% @
50/60Hz.
Consumption:
< 20 watts.
Weight
: 3.5kg. Net (4.8kg.
Shipping)
Size: 1.75"(1U) x 19" x 11.8"
(44 x 482 x 300mm) excluding
connectors.
Options
= Transformers available.
Optional Interfaces AES/EBU Digital Input/Output
Due to continuing product improvement the above specifications are subject to change.
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DP224/6 Operators Manual
Warranty
This product is warranted against defects in components and workmanship only, for a
period of one year from the date of shipment to the end user. During the warranty
period, XTA will, at it's discretion, either repair or replace products which prove to
be defective, provided that the product is returned, shipping prepaid, to an
authorised XTA service facility.
Defects caused by unauthorised modifications, misuse, negligence, act of God or
accident, or any use of this product that is not in accordance with the instructions
provided by XTA, are not covered by this warranty.
This warranty is exclusive and no other warranty is expressed or implied. XTA is not
liable for consequential damages.
Options and Accessories
Part Number
ITX-100
OTX-100
AES-226
OPT-PC1
OPT-103A
OPT-103B
OPT-103C
Part Description
DP226 Transformer balanced inputs (factory fitted only)
DP226 Transformer balanced outputs (factory fitted only)
AES/EBU Digital inputs/outputs (factory fitted only)
‘Type I’ 256k SRAM PCMCIA card
RS232 to RS485 converter (from PC to DP226)
9 pin ‘D’ type to XLR male adaptor cable
9 pin ‘D’ type to 9 pin ‘D’ type cable. (1m)
DP226 Operators Manual
Page 45
Appendices
Appendix 1: Limiter threshold in dB to Vrms lookup table.
dB
Vrms
dB
Vrms
+22
9.75
+5
1.38
+21
8.69
+4
1.23
+20
7.75
+3
1.09
+19
6.90
+2
0.98
+18
6.15
+1
0.87
+17
5.48
0
0.77
+16
4.89
-1
0.69
+15
4.36
-2
0.62
+14
3.88
-3
0.55
+13
3.46
-4
0.49
+12
3.08
-5
0.44
+11
2.75
-6
0.39
+10
2.45
-7
0.35
+9
2.18
-8
0.31
+8
1.95
-9
0.27
+7
1.73
-10
0.24
+6
1.55
Calculation:
Vrms = 0.7746 x 10 ^ (dBu + 20)
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DP226 Operators Manual
Appendix 2: Default X-over settings and names for all formats.
X-over
2x2 way+Ms
Output 1
Low
Output 2
High
Output 3
Low
Output 4
High
Output 5
Msub
Output 6
Aux
120Hz – 1k82Hz 1k82Hz – 22kHz 120Hz – 1k82Hz 1k82Hz – 22kHz 24.8Hz – 120Hz <10Hz – 22kHz
2 x 3 way
Low
Mid
High
Low
Mid
High
22.1Hz – 120Hz 120Hz – 1k82Hz 1k82Hz – 22kHz 22.1Hz – 120Hz 120Hz – 1k82Hz 1k82Hz – 22kHz
4 way + 2
5 way + 1
6 way
Low
LoMid
HiMid
High
Aux
Aux
15Hz – 149Hz 149Hz – 1k31Hz 1k31Hz – 8kHz
8kHz – 22kHz 20.1Hz – 22kHz 20.1Hz – 22kHz
Sub
HiMid
Low
LoMid
High
Aux
15Hz – 80.3Hz 80.3Hz – 180Hz 180Hz – 1k31Hz 1k31Hz – 8kHz
8kHz – 22kHz 20.1Hz – 22kHz
LoSub
LoMid
HiMid
1kHz – 4kHz
4kHz – 10k1Hz 10k1Hz – 22kHz
Sub
Low
15Hz – 80.3Hz 80.3Hz – 149Hz 149Hz – 1kHz
High
Note: All filters set to 24dB Linkwitz-Riley.
DP226 Operators Manual
Page 47
Appendix 3: Equalisation Curves
Parametric Filter Gain Curves
Parametric Filter ‘Q’ Curves
Parametric Filter High and Low Shelving Responses
Page 48
DP226 Operators Manual
Parametric Filter High ‘Q’ – Notch Filter Response
High Pass Filter Response Curves
Low Pass Filter Response Curves
DP226 Operators Manual
Page 49
Appendix 4: Frequently Asked Questions
How do I update my DP226 software from the net?
The XTA website http:wvw.xta.co.uk/xta has the latest release of DP226 software
posted on it along with the latest release of the AudioCore control software.
Download the DP226 software, as explained on the software page to a known folder
on your ‘C’ drive. Locate the downloaded files on your computer and view the ‘Read
me.txt’ file which will take you through, step by step, how to upgrade the DP226.
You will need a 9-pin D to 9-pin D, male to female serial lead wired pin 1 to pin1.
XTA can supply this cable for you – part number OPT-103C.
What is the best way to connect my DP226 to a computer?
The best way is via the ‘External’ RS232 port. This will require a 9-pin D to 9-pin D
lead, as would be used for updating the unit with new software. If it is required to
connect a chain of units to the computer for remote control of an entire system, use
the RS485 XLR sockets to chain the slave units together and to connect them to the
master. This configuration, and several others are explained in the section “Typical
Interface Setups” on page 36.
What kind of PCMCIA card do I need for use with the DP226?
For all applications, whether cloning units, storing sets of input memories, storing
crossovers, or updating software, the unit accepts ‘Type I’ 256K SRAM cards. Note
that any card will only accept one type of data – it is not possible to mix input
memory sets, clone data or any other combination of the data types above on the
same card. XTA can supply this card for you – part number OPT-PC1.
How do I copy settings form one DP226 to another?
This may be accomplished using a function built into the unit known as ‘Unit Cloning’.
This feature permits all settings within one unit to be copied onto a PCMCIA card,
and this card, when inserted into another DP226, will set it up to be operationally and
audibly identical to the original unit. Settings that are copied are all current audio
settings, all crossover memories (9), all input memories (40), and all menu options.
To make the clone card:
Insert a blank PCMCIA card into the slot on the unit you wish to clone, ensuring that
it is pushed fully home. (Menu options will not be available until the card is inserted)
Press ‘MENU’ and then, using the ‘BACK’, ‘NEXT’ and, ‘ENTER keys, select the
‘System Sub-menu’, followed by the ‘Unit Cloning’ option.
Select ‘Store Clone Data’ from this menu.
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DP226 Operators Manual
Before pressing ‘ENTER’, check that the write-protect switch on the card is not
switched on)
Clone data will now have been copied onto the card.
Warning 1: that the write protect switch must be turned on
again prior to removing the card. If it is not, possible data
corruption may occur, resulting in the DP226 not accepting the
settings again.
Warning 2: All settings in the destination unit (the unit to become the clone) will be
overwritten! If this is not acceptable, it might be advisable to create a clone card as
described above for the unit, and keep it as a back-up.
To copy this data to another unit (make the clone):
Insert the card into the unit which will become the clone.
Press ‘MENU’ and then, using the ‘BACK’, ‘NEXT’ and, ‘ENTER keys, select the
‘System Sub-menu’, followed by the ‘Unit Cloning’ option.
Select ‘Recall Clone Data’ from this menu.
The unit will now be identical to the original, having copied all the clone data from the
card.
Can ordinary microphone cables be used for RS485 connections?
Yes. RS485 is a very robust electrical communication specification, operating point to
point over distances up to 1km. As the system only requires a balanced pair of
interconnects with a screen, normal male to female XLR leads are fine. In fact, as
long as individual pairs are screened, a feed in a multicore may be used.
DP226 Operators Manual
Page 51
Appendix 5: Additional Information: General Purpose Interface
The GPI (General Purpose Interface) allows the recall of memories via an external
switch box, alleviating the need for a computer system when only memory changes
are needed.
This information is reproduces in the application note that accompanies the GPI kit
itself. The following parts are contained in the GPI Kit.
• One GPI Interface card;
• One 15pin D-type to 9pin D-type adaptor;
• One male 15pin D-type with hood;
• Software upgrade disk;
• One application note.
Software Installation.
Note that the interface will only operate with software version 3.10 (supplied on the
disk) or later. For DP224 units, the earliest compatible version is 2.10. Included on
the disc supplied with the kit is a readme.txt file. This describes the process of
updating the software in the unit from a PC using the RS232 port. The 9-pin D-type
serial cable supplied with the unit (or equivalent) will be required to connect the
COM port of the PC to the unit. Please read the file on the disc for details.
Hardware Installation.
Ensure that the unit is switched off and that the power cord is removed from the
mains supply!
Position the unit so that the front panel is facing you, remove the seven retaining
screws from the top cover and place the screws and cover to one side. Now locate
the RS232 card and remove the retaining bolts (5mm) from the rear of the unit and
unclip the connector from the main circuit board. The card can now be removed and
the GPI card put in its place. Be sure to tighten the retaining screws but be careful
not to strip the thread.
The installation of the card is now complete - please replace the top cover.
What can I do with the GPI interface?
The interface has two modes of operation, ‘Simple’ and ‘Complex’. In ‘Simple’ mode
the interface allows the recall of the first 7 memories and in ‘Complex’ mode the first
31 memories can be recalled. In both cases the user can select whether input
memories or output (xover) memories are recalled or, if desired, both memories at
the same time. The mode of operation and memory recall options can be set in the
GPI SUB MENU located at the end of the MAIN MENU on the loudspeaker
management system.
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DP226 Operators Manual
What do I need to plug in to recall a memory?
On the following page there are two example circuit diagrams of GPI switches. The
first is a self powered version, that is it takes its power from the unit and is therefore
not fully isolated from the unit. The second diagram is a powered version, this gives
full isolation from the unit, it should be noted however that no more than 10v
should be used to activate the opto isolators as damage could occur.
To recall more than the first 7 memories, ‘Complex’ mode must be used. Details of
the operation of this mode are covered in the next section.
Note that either individual momentary action or latching switches may be used.
Additionally, a rotary switch may be used for the ‘Simple’ mode, but this will mean
that the seven memories will only be accessible in a linear fashion. Individual switches
allows “Random Access” of the memories in any order which might be more useful.
The type of switch used to build a remote interface is not crucial, but XTA suggest
the following as suitable.
Farnell Components Order Code 176-477 (Momentary Push-button Variety)
Farnell Components Order Code 176-478 (Latching Push-button Variety)
Farnell Components Order Code 176-487 (Mounting Bracket for Interlocking Set)
Farnell Components Order Code 176-516 (Interlocking Cam)
Farnell Components Order Code 176-491 (Round Caps)
Farnell Components Order Code 176-492 (Rectangular Caps)
For a rotary switch we suggest:
Farnell Components Order Code 422-381 (Rotary Non-Shorting)
Note that the rotary switch must be a ‘break before make’ variety, or unpredictable
operation may occur.
DP226 Operators Manual
Page 53
15-way D-type
Examples of two typical interfaces that may be used to operate the interface in
‘Simple’ mode.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Momentary Action
Switch (Mem #01)
Momentary Action
Switch (Mem #07)
15-way D-type
Connection using crossover’s own power supply.
Connect pin 5 to pin 9.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Momentary Action
Switch (Mem #01)
+9volts
Momentary Action
Switch (Mem #07)
Connection using external battery supply (9 volt).
Page 54
DP226 Operators Manual
How Do I Configure The Interface?
The GPI Interface sub-menu is at the end of the menu list accessed by pressing
‘MENU’ and scrolling using the ‘NEXT’ key, until the screen shows...
<- Main Menu. . . . . . .
Remote GPI Sub-Menu
Pressing ‘ENTER’ will access the interface sub-menu which is configured as a ‘wizard’,
leading the user through the required parameters.
Pressing ‘ENTER’ will display
Remote GPI Menu
Interface Setup
There are only currently two parameters to configure for correct operation. These
are outlined below.
Firstly, choose the format (operation mode) of the interface, or disable it by setting
this parameter to the ‘OFF’ position. Use the ‘BACK’ and ‘NEXT’ keys to choose
from ‘COMPLEX’, ‘SIMPLE’ or ‘OFF’. The use of the formats is explained in
following sections. ‘COMPLEX’ allows recall of up to the first 31 memories; ‘SIMPLE’
allows the first 7 to be accessed. Press ‘ENTER’ when ready.
<- Interface Setup ->
GPI Format: COMPLEX
Next, choose whether the recall will operate on input memories, output (crossover)
memories, or both. Choosing ‘Both’ means that corresponding input equalisation and
output crossover settings will be recalled simultaneously. Assure that the correct
input and output settings are in corresponding memory numbers (input memory 01
with crossover 01 etc.) to avoid accidental recalling of incorrect configurations!
<- Interface Setup ->
Memories: Outputs
Finally, after pressing ‘ENTER’ to accept these new settings, a final warning message
is displayed. Press ‘ENTER’ again to confirm the changes, or press ‘QUIT’ to cancel
all changes and revert to the default screen.
DP226 Operators Manual
Page 55
How Do I Trigger a Memory Recall?
As can be seen from the schematic diagrams, the ‘Simple’ mode of operation just
involves connecting a single pin of the socket to a positive supply, derived either from
the unit (non-isolated – ground must also be connected from pin 5 to pin 9), or from
an external supply. In the case of the external supply, its ground must be connected
to pin 9 to complete the circuit. In both cases, only a momentary action switch is
required, but latching ones may be used if a physical indication of the remote memory
selected is required.
For the remote recall of more than the first 7 memories, the ‘Complex’ mode must
be used. This involves presenting a 5-bit binary number on the pins originally used for
initiating individual memories in ‘Simple’ mode. Use the ‘lowest’ five pins (for
memories 01 to 05 in ‘Simple’ mode. The following table details how to recall
memories in ‘Complex’ mode. A ‘1’ below a pin number corresponds to a positive
voltage (at least 2.5V, but no more than 10v) on that pin; a ‘0’ means ground (or open
circuit). So, for example, to recall memory 13 pins 8, 10, and 3 need to be ‘pulled
high’ with a positive voltage. As with the ‘Simple’ mode, this need only be a
momentary action, but may be latched (permanent) if some form of remote static
indication is required.
15-Pin Interface Connections
Page 56
Memory Number
Pin13
Pin10
Pin8
Pin4
Pin3
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DP226 Operators Manual
Pin 1
2
6
11
3
12
4
8
7
13
5
9
14
10
15
Pin Numbering of 15-pin connector
(as viewed from the rear of the unit)
Have I Lost My RS-232 Port?
No. The circuitry for the RS-232 port is included on the GPI card. An adapter is
included in the GPI kit which plugs into the 15-pin connector, and converts it to the
original 9-pin which may be used in exactly the same way as before. The menu
options relating to the standard interface have not changed.
The port may be used for loading software upgrades, and remote control
applications. Note that new software is required to operate the GPI interface itself.
DP226 Operators Manual
Page 57
Appendix 6: DP224 Crossover Configurations
Single channel 2 way with 2 auxiliaries, fed from either input B, or the sum of A & B.
2 way crossover, which may be configured to operate in stereo.
Page 58
DP226 Operators Manual
3 way crossover, with one auxiliary which may be fed from input B or A & B summed.
4 way crossover.
DP226 Operators Manual
Page 59
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