XO1 User`s Manual - Funktion-One
XO-1 Users Manual
XO1 Quick Reference
Accessing channels: Use channel’s SELECT button.
First press accesses that channel’s gain.
Second press accesses last viewed parameter.
Third press will drop back to the default screen.
To scroll through a channel’s parameters, use the
BACK and NEXT keys.
Accessing menus: Press the MENU key, then the
BACK and NEXT keys to find the sub-menu
required, and select using the ENTER key. This
applies to all levels of menu; ENTER always confirms
selections.
The Menus and their Contents
Input Setup Sub-menu: Used for ganging input gain
and base delays.
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).
Notes
The crossover and 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.
XO1 Operators Manual
Page 1
Contents
XO1 Quick Reference
1
The Menus and their Contents
Notes
1
1
Contents
2
Important Safety Information
4
Thanks
5
Unpacking the XO1
5
Introduction
6
Features
6
Front Panel Familiarisation
8
Rear Panel Connections
9
Operating the XO1
10
Preliminary Set-up
10
XO1 Configurations
11
Introduction
2 x 2 way with Mono Sum
2 x 3 way
4 way + 2
5 way + 1
6 way
11
11
12
13
14
15
Screen Layouts Overview
16
Gain Screen
Polarity Screen
Delay Screen
High and Low Pass Filter Screens
Parametric Equaliser Screen
Limiter Screen
17
18
19
20
21
22
Menu Selection
23
Input Setup Sub-menu
24
Gang Inputs
24
X-over Sub-Menu
25
Load a Xover
Design a Xover
Store a Xover
Erase a Xover Mem
25
25
25
25
Security Sub-Menu
26
User Specific
Xover Only
Xover + Trim
Xover + Trim + Mute
Changes Only
Changes + View
Changes + Mutes
EVERYTHING
Entering the Password to Complete the Locking Operation
Page 2
26
26
26
26
26
26
26
26
27
XO1 Operators Manual
System Sub-Menu
System Status
LCD Contrast
LED Brightness
Temperature Alarm
Wake-up Time
Output Meters
Filter Q or BW
Delay Time/Distance
Interface Sub-Menu
Interface Setup
28
28
28
28
28
28
28
28
28
29
29
AES / EBU Sub-Menu
30
Routing Options
AES Diagnostics
AES / EBU Connections
30
30
30
Operating Notes
Operating Level
Grounding
Crossover Filter Slopes
Time Alignment
Output Limiters
Setting Accurate Limiter Thresholds
31
31
31
32
32
33
34
Specifications
36
Warranty
37
Options and Accessories
37
Appendices
38
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
XO1 Operators Manual
38
39
40
Page 3
An example of this equipment has been tested and found to comply with
the following European and international Standards for Electromagnetic
Compatibility and Electrical Safety:
Radiated Emissions (EU):
EN55013-1 (1996)
RF Immunity (EU): EN55103-2 (1996) RF Immunity, ESD, Burst Transient, Surge,
Dips &Dwells
Electrical Safety (EU):
EN60065 (1993)
Important Safety Information
Do not remove Covers.
No user serviceable parts inside, refer servicing to qualified service personnel.
This equipment must be earthed.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
DO NOT EXPOSE TO RAIN 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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XO1 Operators Manual
Thanks
Thank you for choosing the XO1 for your application. Please spend a little time
reading through this manual, so that you obtain the best possible performance from
the unit.
All our 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 product, please contact us.
We look forward to hearing from you in the near future.
Unpacking the XO1
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.
XO1 Operators Manual
Page 5
Introduction
The XO1 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 XO1 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, and variable base delay. 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.
Multi-part security lock-out is available for all controls.
The XO1 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.
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 30 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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XO1 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.
AES/EBU Digital input and output interfaces are available as an option.
Input and output balancing transformers are also available as an option.
XO1 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.
SELECT 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 ‘-6dB’ LED illuminates at 6dB below the actual clipping point
of the input section. The red ‘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 3dB below limiting for that channel. The red
LED indicates the onset of limiting.
Mute Keys: mutes the appropriate channel, and illuminates the
associated LED.
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XO1 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, enabling the
uploading of new software to the unit.
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.
XO1 Operators Manual
Page 9
Operating the XO1
Preliminary Set-up
The procedure below should be followed when first installing a XO1.
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 SELECT 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 SELECT 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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XO1 Operators Manual
XO1 Configurations
Introduction
To simplify the set-up of the XO1, 5 crossover modes are selectable from the X-over
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.
XO1 Operators Manual
Page 11
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.
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XO1 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.
XO1 Operators Manual
Page 13
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.
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XO1 Operators Manual
6 way
This format feeds input A to all outputs designated lo-sub, through high, 1 to 6
respectively.
XO1 Operators Manual
Page 15
Screen Layouts Overview
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XO1 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 31.
XO1 Operators Manual
Page 17
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 180q) the phase of individual outputs.
Note: When the outputs are ganged, the polarity screens remain
individual.
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XO1 Operators Manual
Delay Screen
To adjust delay settings:
Use the ‘FREQ’ control for coarse control. (1mS steps)
Use the ‘Q’ control for fine control. (2.6PS 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 2.6PS 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 32.
XO1 Operators Manual
Page 19
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 32.
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XO1 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 XO1'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.
XO1 Operators Manual
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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 33.
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XO1 Operators Manual
Menu Selection
The following menu selections are available:
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.
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.
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 26.
System Sub-menu:
System Status – displays unit info, such as version & 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.
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)
Interface Sub-menu:
Interface Setup – enable/disable interface and set baud rate.
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.)
XO1 Operators Manual
Page 23
Input Setup Sub-menu
There is one option in this menu:
Gang Inputs
Gangs A and B inputs so that precise adjustments can be made to both inputs
simultaneously, 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.
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XO1 Operators Manual
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
2 x 3 Way
4 Way
5 Way
6 Way
Out
5
Source:A/A+B
Out
6 Out
6
Source:A/A+B Source:A/A+B
Gang
Outputs:Yes/N
o
Auto
Limit
TC:Yes/No
Gang
Outputs:Yes/N
o
Auto
Limit Auto
Limit Auto
Limit Auto
Limit
TC:Yes/No
TC:Yes/No
TC:Yes/No
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.
XO1 Operators Manual
Page 25
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 SELECT 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 SELECT and MUTE keys do nothing.
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XO1 Operators Manual
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 ‘SELECT’ keys can be used to enter a code by pressing any
combination of the eight buttons. Each ‘SELECT’ 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 sales office.
XO1 Operators Manual
Page 27
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 80qC. The default screen will flash
‘ALARM. Temp = nqC’ when the specified temperature is reached. (N.B. the
warning does not affect the units’ performance in any respect.)
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.
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XO1 Operators Manual
Interface Sub-Menu
Interface Setup
If the interface is enabled, the option will become available to select the baud rate.
This must be set to match that on the PC to be used for the program update.
Typically, the set-up would be as below.
XO1 Operators Manual
Page 29
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
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XO1 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 XO1 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)
XO1 Operators Manual
Page 31
Crossover Filter Slopes
Please consult the block diagrams on page 11 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 XO1 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 XO1's display.
Filter Type
Bessel 12dB/Oct.
Butterworth 12dB/Oct.
Bessel 18dB/Oct.
Butterworth 18dB/Oct.
Bessel 24dB/Oct.
Butterworth 24dB/Oct.
High pass factors
1.45
1.31
1.37
1.19
1.35
1.15
Low pass factors
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 XO1 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 2.6PS steps (1mm).
Please see page 19 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+qC
where qC is the temperature in qC.
To simplify this equation at 20qC.
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 32
XO1 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 22 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)
XO1 Operators Manual
Page 33
Setting Accurate Limiter Thresholds
The limiters built into the XO1 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 XO1’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 XO1’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:
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:
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:
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.
Page 34
XO1 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.
XO1 Operators Manual
Page 35
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
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: r15dB 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 3 point
Output meter: 6 x 3 point
Connectors
Inputs: 3 pin female XLR
Outputs: 3 pin male XLR.
External: 9 pin DEE connector (RS232)
Power: 3 pin IEC
Power: 60 to 250V r15% @
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.
Page 36
XO1 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 Description
XO1 Transformer balanced inputs (factory fitted only)
XO1 Transformer balanced outputs (factory fitted only)
AES/EBU Digital inputs/outputs (factory fitted only)
9 pin ‘D’ type to 9 pin ‘D’ type cable. (1m)
XO1 Operators Manual
Page 37
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)
Page 38
DXO1Operators 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.
XO1 Operators Manual
Page 39
Appendix 3: Equalisation Curves
Parametric Filter Gain Curves
Parametric Filter ‘Q’ Curves
Parametric Filter High and Low Shelving Responses
Page 40
DXO1Operators Manual
Parametric Filter High ‘Q’ – Notch Filter Response
High Pass Filter Response Curves
Low Pass Filter Response Curves
XO1 Operators Manual
Page 41
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