owners manual
X-Four mixing console
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table of contents
mono inputs
p. 7
p. 25
p. 41
p. 57
p. 81
1
2
3
4
5
stereo inputs
group
master
power supply
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X-Four owner’s manual
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how to use this manual
conventions
terms
indicators or controls employed on the X-Four console
will appear as: TERMS
tasks
are broken down into steps
1
2
3
warnings
Procedures not to attempt.
a
Issues or hazards to keep
in mind when operating
the equipment.
indicators
What to look
®
for on-screen.
Alerts, indicators, or
prompts that may appear.
tips
Prefered methods.
Helpful hints.
+
Feature insights.
see
see—references other sections of the manual containing
supplementary information on the current topic or a related issue
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
legend
p.6
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mono input module
1
features
phantom power—+48V
48 volts DC is applied to pins 2 and 3 on the mic-input XLR con-
nector. This option is used with condenser microphones and active direct
boxes that require an external DC voltage (phantom power) in order to
operate.
The 48V switch should
not be engaged when
using standard (dynamic)
microphones, or other
sources that do not use
phantom power.
a
pad
The mic-input signal is attenuated by 15dB to prevent some signals
(e.g. kick drum or lead vocal) from overloading the preamp stage.The pad
is used to bring a hot mic-input signal down to a controllable level.The
15dB pad is not functional when the LINE switch is depressed.
If the channel peak
LED is illuminated,
first try lowering
+
the input gain control.
Only when this method is
unsuccessful should the pad
switch be engaged.
line
The input preamp circuit is set up to accept a mic-level signal. This
signal is brought in via the XLR mic-input connector located on the rear
panel.The 1/4"TRS input jack is disabled.
If the 48V phantom
power switch is
engaged, depressing this
switch disconnects phantom
power from the mic input
XLR.
The input preamp circuit is set up to accept a line-level signal from
either the XLR mic-input connector or the 1/4"TRS input jack,both locat-
ed on the rear panel.
+
+
When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input
connector is disabled.
polarity reverse—ø
This feature is used for correcting or minimizing polarity and phase relat-
ed errors. For example, occasionally a balanced input connection is
reverse-wired before it gets to the mixing console. This can happen in
microphones, or in snake line interfaces. By using the polarity reverse fea-
ture, this type of error can be corrected.
When similar signals
from different chan-
nels are combined, phase
cancellations can occur.
Reversing the polarity of an
input signal often corrects
such phasing errors.
polarity inverted
polarity not inverted
p.7
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
legend
p.8
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mono input module
1
features
gain
The Input gain control range is closely related to the status of the PAD
switch and the LINE switch. In order to establish proper gain structure in
the console, input gain settings must be set correctly.
LINE—switch-up
15 to 75dB of gain can be added the mic-input signal.
The impedance at the input XLR is 4kΩ.
PAD—switch-up
If the channel peak
LED is illuminated,
first try lowering
+
the input gain control.
Only when this method is
unsuccessful should the pad
switch be engaged.
LINE—switch-up
-5 to 55dB of gain can be added to the mic-input signal.
The impedance at the input XLR is 4kΩ.
PAD—switch-down
LINE—switch-down
PAD—switch-up or -down
-10 to 45dB of gain can be added the line-input signal.
The impedance at the input XLR and input 1/4"TRS is 20kΩ.
high-pass filter—HPF
Proper use of the high-pass filter reduces or eliminates unwanted low fre-
quencies without substantially affecting the program material. Quite often
such unwanted low frequencies are included with in-coming mic- or line-
input signals.For example,stage rumble or wind can be picked up through
vocal mics.The slope of the high-pass filter is 12dB per octave.
HPF
High-pass filter is on @ 80 Hz, 12 dB/octave
p.9
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
legend
p.10
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mono input module
1
EQ features
Many audio signals coming into the console require some degree of cor-
rective eq in order to be part of a good sounding mix.
The input eq consists of four-bands: high, high-mid, low-mid and low.
The high and low bands have fixed frequencies while the high-mid and low-
mid bands are sweepable, with their higher and lower frequencies over-
lapping adjacent bands.
high frequency—HF
15dB boost and cut at 12kHz.
The boost response is bell-shaped and the cut response is shelving.
high-mid frequency—HM
15dB boost and cut.
Selectable frequency range of 400Hz to 8 kHz.
The response is bell shaped with a fixed Q of 1.5
low-mid frequency—LM
15dB boost and cut
Selectable frequency range of 80Hz to 2 kHz.
The response is bell shaped with a fixed Q of 1.5
low frequency—LF
15dB boost and cut at 80Hz.
The boost response is bell-shaped and the cut response is shelving.
eq on
Equalizer is on. This switch can be used to make A/B comparisons
between "flat" and eq'd signals.
p.11
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.12
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mono input module
1
aux send features
Six auxiliary AUX SENDS are available for creating individual output mixes.
These mixes can be used for driving effects processors,providing monitor
mixes, creating broadcast or alternate sound reinforcement mixes, or
other special requirements.
aux sends 1–6
These knobs adjust the amount of signal sent to the AUX buses.
Unity gain occurs at the zero setting. AUX 6 and 8 controls pan function
when selected for stereo operation.
aux 1–4, 5/6 pre-fader—PRE
The default signal source for the AUX SENDS is post-fader.These switches
are used for selecting the pre-fader signal for their respective auxes.The
pre-fader signal is derived post-mute and post-eq.
see—internal jumper options
AUX SENDS are post-eq, post-mute, and post-fader.
AUX SENDS are post-eq, post-mute, and pre-fader.
aux stereo 5/6
The default configuration for AUX 5, and 6, are mono, as with AUX 1–4.
In situations where stereo-aux signals are required (such as driving stereo
in-ear monitors or effects processors), this switch reconfigures the AUX
SENDS to operate in stereo by changing the functions of the potentiometers.
AUXES are configured as individual mono sends.
AUXES are configured as level and pan for stereo operation.
p.13
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.14
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mono input module
1
bus assignment features
The Input bus assignment section offers considerable flexibility for creat-
ing what eventually becomes the main output mix. Such features as LCR,
GROUP PAN ON and eight-individual group assignments allow several
approaches to building the desired mix.All assignments are derived post-
fader, post-eq, and post-mute.
left-center-right—LCR
This feature is used to precisely position a signal in a sound system with a
center speaker cluster in addition to left and right clusters.The PAN control
becomes an integral part of how the input-signal is sent to the LEFT, CEN-
TER, and RIGHT outputs.
The post-fader signal is assigned to the LEFT,RIGHT, and MONO/CENTER
buses. Relative amounts of the signal fed to each bus is determined by the
position of the PAN control.
pan control
The pan control positions the signal within the stereo left/right field,
(or between left center or center right in LCR mode).The signal must be
/
/
assigned as stereo in order for the pan control to have any affect.
see—left-center-right
mute
An internal jumper
can be used to defeat
pre-fader muting.
The Mute switch mutes the channel as well as both pre- and post-
fader AUX SENDS.
+
write-in label
This label may be written on with a grease-marker, and later wiped clean
with a cloth moistened with isopropyl/rubbing alcohol. Masking tape may
also be placed on this surface, if desired.
p.15
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.16
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mono input module
1
bus assignment features
mute
The Mute switch mutes the channel as well as both pre- and post-
fader AUX SENDS.
write-in label
This label may be written on with a grease-marker, and later wiped clean
with a cloth moistened with isopropyl/rubbing alcohol. Masking tape may
also be placed on this surface, if desired.
p.17
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.18
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mono input module
1
level meter features
level meter
LED
LED
LED
LED
LED
Each input includes a five-segment LED meter
for visually monitoring signal levels.This is essential for setting up and main-
taining proper gain structure.
peak indicator—PK
LED
The input signal is monitored at several points throughout the chan-
Occasional flashing of the
peak LED is acceptable,
but frequent flashes indi-
cate that channel levels
must be lowered.
®
nel.These points are the mic preamp, the EQ stage and the fader stage.
Overloads at any of these stages will cause the red peak-LED to light.
Then the channel gain should reduced.
If the channel peak
LED is illuminated,
first try lowering
signal level LED’s
+
LED
the input gain control.
These three LED's light up at +8—yellow, 0—green, and -6 dB—
Only when this method is
unsuccessful should the pad
switch be engaged.
green. This level range -6 to +8 is the optimum operating range.
Compressed or relatively constant signals should remain close to 0.
signal present indicator—SIG
LED
This green-LED varies in brightness in response to signal levels
between -40 dB and -6 dB.
p.19
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.20
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mono input module
1
bus assignment features
Always turn off and
disconnect the amplifi-
er from mains voltage
before making audio
connections.
+
mono assignment—M
The signal is assigned to the discrete mono bus.
When the LCR button is depressed, this switch is bypassed.
As an extra precaution, have
the attenuators turned down
during power-up.
left / right assignment—L-R
The Group signal is assigned to the main Left and Right output buses,
deriving its signal after the channels pan system.When the LCR button is
depressed, this switch is bypassed.
pan on—groups—BAL ON
The four GROUP assignment switches assign the input signal in mono,
independent of the pan pot.
The four GROUP assignment switches assign signals as four stereo-
pairs.The PAN control governs the stereo placement of the four stereo-
pairs, which are now configured as odd–left / even–right.
For example:GROUP 1—left,GROUP 2—right,GROUP 3—left,GROUP 4—right.
group 1–4 assignment
The input channel's post-fader signal is assigned to the correspond-
ing GROUP bus(es).
see—pan on—groups
input fader
The input fader is the primary level control for signals being sent to any of
the console's mix buses.The only signals not affected are AUX sends select-
ed to be pre-fader. The fader offers greater than 80db of attenuation and
up to 10db of boost. Normal operation is between -10 and 0.
pre-fader listen—PFL
Pressing this switch will include (illuminated) or exclude (not-illumi-
nated) the input channel.
see—master module
p.21
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mono input module
X-Four owner’s manual
1
panel
module
block diagram
p.22
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mono input module
1
rear panel features
direct out 1/4"TRS jack
The input channel's signal is available at this output jack.The
default signal routing is derived post-fader, post-eq and post-mute.This
output jack is ground-compensated.
insert points
Separate 1/4" TRS jacks provide the facilities for inserting an external sig-
nal processor into the signal path of the input channel.
insert send
This jack serves as an output for connection to the input of a
signal processor.The signal is derived after the mic preamp and HPF but
before the eq section.Plugging a 1/4"TRS plug into this jack does not break
the signal flow of the channel.This output jack is ground-compensated.
The insert send can
also be used as an
additional channel output
when s pre-EQ signal is
needed.
+
insert return
The output of a signal processor is fed to this jack.It can accept
a balanced or unbalanced signal and is located pre-eq.
In situations where
the preamp circuitry is
not needed, the Insert
Return can be used as the
channel’s input.
+
balanced line-in jack—Bal Line In
Line-level signals, balanced or unbalanced, may be brought into
the input channel through this jack.The LINE switch must be depressed for
this jack to be active.
For example, when using an
expensive tube mic preamp.
balanced mic-in xlr connector—Bal Mic In
F
This balanced female XLR accepts a low-impedance microphone
signal, or a line-level signal, depending on position of the LINE switch on
the front panel.
see—mono input module, phantom power, line
p.23
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
legend
p.24
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stereo input module
2
features
The stereo input module can be configured to operate as either stereo or
To avoid redundancy,
mono features will refer
back to corresponding sec-
tions on the Mono module.
+
mono.When configured to operate in mono, many features are identical
to those of the mono input module.
Descriptions given here are
specifically for the default
Stereo configuration.
line select—Line 2
This switch determines selection of input signals from the three sets of
rear panel connectors.
The channel is in LINE 1 MODE.The signals are brought in via the left
and right line-input XLRs located on the rear panel.
The channel is in LINE 2 MODE.The signals are brought in via the RCA
line-input connectors which are normalled through the 1/4"TRS line-input
jacks. Insertion of a plug into the 1/4" jack disconnects the RCA jacks.
left and right mono-switches
These switches provide several options for configuring the stereo line-
input module as a mono line-input module.
left
right
Signals brought into the left and right inputs are treated as stereo
throughout the module.
left
right
Signals brought into the left and right inputs are summed together imme-
diately before the GAIN control.The summed signal is treated as mono
throughout the rest of the module.
left
right
The signal fed to the left input is treated as a mono signal throughout the
module. No signal from the right input is used.
left
right
The signal fed to the right input is treated as a mono signal throughout
the module. No signal from the left input is used.
p.25
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
legend
p.26
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stereo input module
2
features
input gain—GAIN
This control adjust the gain of the input preamp(s).
Both left and right input signals are affected by this control.
polarity reverse—ø
This switch inverts the polarity of the right input signal in relation to the
left input signal.
see—mono input module
Polarity of the right input signal is inverted.
Polarity of the right input signal is not inverted.
high-pass filter—HPF
The high-pass filter is activated for signals coming into both the left and
right inputs.The shelving frequency is fixed at 80Hz with a slope of 12dB
per octave.
Proper use of the high-pass filter reduces or eliminates unwanted low fre-
quencies, without substantially affecting the program material. Quite often
such unwanted low frequencies are included with in-coming mic- or line-
input signals.For example,stage-rumble or wind can be picked up through
vocal mics.
p.27
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
legend
p.28
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stereo input module
2
four-band stereo EQ features
Although left and right signals are processed separately,the parameters are
set in tandem by common front-panel controls.
see—mono input module
high frequency—HF
15dB boost and cut at 12kHz—shelving response.
high-mid frequency—HM
15dB boost and cut.
Selectable frequency range of 400Hz to 8 kHz.
The response is bell-shaped with a fixed Q of 1.5
low-mid frequency—LM
15dB boost and cut.
Selectable frequency range of 80Hz to 2kHz.
The response is bell-shaped with a fixed Q of 1.5
low frequency—LF
15dB boost and cut at 80Hz.
The boost response is bell-shaped and the cut response is shelving.
equalizer—EQ ON
Equalizer is on.This switch can be used to make A/B comparisons
between "flat" and eq'd signals.
p.29
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
p.30
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stereo input module
2
aux send features
The following descriptions apply to the stereo line input module when
configured for stereo operation.
see—mono input module for mono operation
aux send 1–6 controls
These knobs adjust the amount of signal sent the AUX buses.
AUX 1–4 are fed from a summed-mono source. AUXES 5–6 are also fed
from this mono source, but can be switched to stereo operation.
see—stereo balance
aux 1-4, 5/6 pre-fader—PRE
The default signal source for the AUX SENDS is post-fader.These switches
select a pre-fader source for their respective auxes.The pre-fader signal is
derived post-mute and post-eq.
see—internal jumper options
Corresponding AUX SENDS are post-eq, post-mute and post-fader.
Corresponding AUX SENDS are post-eq, post-mute and pre-fader.
stereo balance 5 and 6—STEREO
AUX 5 and 6 are mono.
AUX 5 acts as a left and right level-control and AUX 6 acts as a left/right
balance-control.
p.31
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
p.32
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stereo input module
2
bus assignment features
balance control
The Balance control adjusts the Stereo balance for Left/Right and the
Group Assignment section when in Balance mode.
When the Stereo Line Input module is being used as a Mono input, the
Balance control functions as a Pan control.
mute
see—mono input module for full description
write-in label
This label may be written on with a grease-marker, and later wiped clean
with a cloth moistened with isopropyl/rubbing alcohol.
p.33
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
p.34
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stereo input module
2
bus assignment features
peak indicator—PK
LED
The input signal is monitored at several points throughout the chan-
nel.These points are the mic preamp, the EQ stage and the fader stage.
Overloads at any of these stages will cause the red peak-LED to light.
Then the channel gain should reduced.
signal level LED’s
LED
These three LED's light up at +8—yellow, 0—green, and -6 dB—
green. This level range -6 to +8 is the optimum operating range.
Compressed or relatively constant signals should remain close to 0.
mono assignment—M
The input signal is assigned to the discrete mono bus. Left and right
signals are summed to make up the mono or center signal.
Best operation occurs when
the green LED is brightly
illuminated and the red LED
occasionally flickers.
®
left/right assignment—L/R
The stereo input signals are assigned directly to the main left and
right output buses.
The proportion of left vs. right can be adjusted by the BALANCE control.
p.35
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
p.36
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stereo input module
2
bus assignment features
balance on—groups—BAL ON
The left and right signals are summed as mono to make up the group
assignment signals.
The left and right signals are assigned in stereo to the groups in
odd/even pairs.GROUP assignment switches 1 and 3 carry the left input-sig-
nal and GROUP assignment switches 2 and 4 carry the right input-signal.
The proportion of left vs. right can be adjusted by the BALANCE control.
group 1–4 assignment
The input channel's post-fader signal is assigned to the correspond-
ing GROUP bus(es).
see—balance on—groups
input fader
The input fader is the primary level control for signals being sent to any of
the console's mix buses.The only signals not affected are AUX sends select-
ed to be pre-fader. The fader offers greater than 80db of attenuation and
up to 10db of boost. Normal operation is between -10 and 0.
pre-fader listen—PFL
Pressing this switch will include (illuminated) or exclude (not-illumi-
nated) the input channel.
see—master module
p.37
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stereo input module
X-Four owner’s manual
2
panel
module
block diagram
p.38
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stereo input module
2
rear panel features
The stereo line-input module provides connectors for three stereo line-
level signals.
see—line 2 switch.
F
balanced left and right line-in XLR connectors
These two jacks accept balanced or unbalanced +4dB line level signals.The
LINE 2 switch on front-panel must be disengaged for these connectors to
be active.
line-input left and right 1/4"TRS jacks
These two jacks accept balanced or unbalanced line level signals.The LINE
2 switch on front panel must be engaged for these jacks to be active.
line-input left and right RCA connectors
These two jacks accept unbalanced line-level signals.They are active when
the LINE 2 switch on front-panel is engaged and nothing is plugged into the
corresponding left or right 1/4"TRS jack(s).
p.39
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group module
X-Four owner’s manual
3
panel
module
block diagram
p.40
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group module
3
output eq features
The X-Four output-section includes eight output-equalizers occupying the
upper portions of the four GROUP sub-modules and the four MASTER sub-
modules.
By using designated assignment switches, output eq’s can be fed by the six
AUXES or GROUPS, the two matrix masters or left, right, and mono masters.
Each eq features four bands of equalization, making them ideal for feeding
on-stage or in-ear monitors.
high frequency—HF
15dB boost and cut at 12kHz—shelving response.
high-mid frequency—HM
15dB boost and cut.
Selectable frequency range of 400Hz to 8 kHz.
The response is bell-shaped with a fixed Q of 1.5
mid frequency—MID
15dB boost and cut
Selectable frequency range of 200Hz to 4kHz.
The response is bell-shaped with a fixed Q of 1.5
low-mid frequency—LM
15dB boost and cut.
Selectable frequency range of 80Hz to 2kHz.
The response is bell-shaped with a fixed Q of 1.5
low frequency—LF
15dB boost and cut at 80Hz.
The boost response is bell-shaped and the cut response is shelving.
p.41
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group module
X-Four owner’s manual
3
panel
module
block diagram
p.42
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group module
3
output EQ features
equalizer—EQ ON
This switch can be
used to make A/B
comparisons of "flat"
and EQ'd signals.
+
Equalizer is on.This switch can be used to make A/B comparisons
between "flat" and eq'd signals.
group equalization —per output channel—EQ TO GROUP
This switch selects the signal path for the eq.
eq to AUX MASTERS
eq to GROUPS
p.43
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group module
X-Four owner’s manual
3
panel
module
block diagram
legend
p.44
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group module
3
matrix features
The X-Four includes two MATRIX outputs. Each of these outputs can be
made up of signals from the four GROUPS; the left, right and mono buses;
and an external source.
matrix 1–2 levels—M1, M2
These level controls are used to mix the group's signal into the cor-
responding matrix.
post-group
The GROUP fader setting has no effect on the group-to-matrix level
controls 1–2.
The GROUP fader is introduced into the signal path.When the group
is muted, the matrix level controls 1–2 are muted as well.
p.45
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group module
X-Four owner’s manual
3
panel
module
block diagram
legend
p.46
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group module
3
fader reverse
The AUX / GRP feature is used to swap the functions of the AUX MASTER con-
trols and the GROUP MASTER controls and the AUX MASTER and LEFT/RIGHT
MAIN controls.
Swapped controls include: the TALK TO switch, the SOLO switch, the MUTE
switch,and the MASTER LEVEL control (via rotary control on the AUX MASTER
and a fader on the GROUP MASTER).
reversing aux / group and aux / main
AUX—red LED off
The AUX 1–6 and GROUP 1–4 MASTER and LEFT/RIGHT MAIN level controls,
SOLO,MUTE and TALK TO switches operate as normal in their default con-
figuration.
LED
GRP—red LED on
AUX and GROUP functions are reversed.
The AUX 1–6 output levels are controlled by the output faders.
The AUX SAFE PREVIEW LED,AUX SOLO, and AUX TALK TO switches apply to
the GROUP output signal.
The GROUP 1–4 and LEFT/RIGHT MAIN output levels are controlled by the
rotary AUX 1–6 MASTER level controls.
The GROUP SOLO,GROUP MUTE and GROUP TALK TO switches apply to the
AUX output signal.
aux 1–6 output level
The AUX MASTER output level controls set the levels that appear at the
corresponding AUX output connectors on the rear-panel.
talk to—aux 1–6
Adds the TALKBACK system output to the associated AUX output.The
level of the TALKBACK signal is set by the TALKBACK level control in the MAS-
TER section.
after-fader listen—AFL
Pressing this switch will include the AUX (when illuminated) or
exclude (when not illuminated).
see—master module
p.47
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group module
X-Four owner’s manual
3
panel
module
block diagram
legend
p.48
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group module
3
group assignment features
This is a useful fea-
ture when the mixer is
being used to feed on-stage
or in-ear monitors.
+
mono assignment—from group—MONO
The GROUP signal is assigned to the discrete mono bus.
A red LED visually indicates
when this feature has been
selected.
There is one switch for each
of the six AUX MASTERS /
GROUP MASTERS.
left/right assignment—from group—L/R
The GROUP signal is assigned to the main left and right output buses.
pan
The PAN pot is used to position the group signal within the stereo left
/ right field.The signal must be assigned to left and right in order for the
PAN control to have any effect.
mute
see—mono input module for full description
p.49
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group module
X-Four owner’s manual
3
panel
module
block diagram
p.50
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group module
3
group/aux level features
signal/peak LED’s
LED
This dual color LED responds to the pre-fader signal. It illuminates
green with varying brightness in proportion to the audio signal.When the
signal approaches clipping, the LED illuminates red.
talk to—fader 1–4
This switch adds the TALKBACK system output to the fader signal.The
level of the TALKBACK signal is set by the TALKBACK level control in the MAS-
TER section.
fader
The fader normally controls the level at which the GROUP signal is sent to
any assigned buses or outputs. When the REVERSE AUX/GROUP switch is
selected, the fader controls the level of the AUX output.
after-fader listen—AFL
Pressing this switch will include or exclude the fader signal (when not
illuminated).
p.51
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group module
X-Four owner’s manual
3
panel
module
block diagram
p.52
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group module
3
rear panel features
group output
M
This balanced male XLR connector carries the GROUP output signal.
see—group fader, front-panel description
group insert point
Separate 1/4" TRS jacks provide the ability to insert an external signal
processor into the signal path of the GROUP.
group insert send
Plugging a 1/4" plug
This output connects to the input of an external signal proces-
sor. The signal is derived after the group-summing amplifier.
into this jack does not
break the internal signal
flow of the Group.
+
This output is ground compensated.
group insert return
Plugging a 1/4" plug
into this jack breaks
the signal flow
This balanced input accepts a signal from the output of an
external signal processor. It accepts either balanced or unbalanced signals.
+
of the Group.
p.53
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group module
X-Four owner’s manual
3
panel
module
block diagram
lamp dim switch and DC IN connector
p.54
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group module
3
rear panel features
auxiliary 1–6 output XLR’s
M
This balanced male XLR connector carries the AUX output signal.
These outputs are controlled by their respective AUX output level controls.
see—aux section, front panel description
aux insert point
Separate 1/4"TRS jacks provide the ability to insert an external
signal processor into the signal path of the AUX.
aux insert send
Plugging a 1/4" plug
This output connects to the input of an external signal proces-
sor. The signal is derived after the group-summing amplifier.
into this jack does not
break the internal signal
flow of the Group.
+
This output is ground-compensated.
group inputs 1–4
These 1/4"TRS jacks accept balanced or unbalanced line-level signals.
They act as external inputs for GROUPS 1–4.
lamp dim
Goose-neck lamps light-up at full intensity.
Goose-neck lamps light-up at medium intensity.
p.55
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master module
X-Four owner’s manual
5
module
block diagram
panel
p.56
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master module
5
output EQ features
On the MASTER module block, the default sources for the four output eq’s
are the AUX 5 and 6, and MATRIX 1 and 2.
By using designated assignment switches, source for the first three output
eq’s can be switched over to the left, right and mono masters.The fourth
eq is always fed by MATRIX 2 master.
All eq's feature four bands of equalization.
see—group module
high frequency—HF
boost / cut -15 dB boost and cut at 12kHz—shelving response.
high-mid frequency—HM
boost / cut - 15 dB boost and cut.
selectable frequency range of 400Hz to 8 kHz.
The response is bell-shaped with a fixed Q of 1.5.
low-mid frequency—LM
boost / cut - 15 dB boost and cut
selectable frequency range of 80Hz to 2 kHz.
The response is bell-shaped with a fixed Q of 1.5.
low frequency—LF
boost / cut 15 dB boost and cut @ 80Hz.
p.57
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master module
X-Four owner’s manual
5
module
block diagram
panel
p.58
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master module
5
output EQ features
equalizer—EQ ON
Equalizer is on. This switch can be used to make A/B comparisons
between flat and eq’d signals.
left, right, mono equalization—EQTO LEFT,TO RIGHT,TO MONO
These three switches select the signals fed to each of the first three
eq’s on the first three master sub-modules.The fourth MASTER sub-module
does not include a switch because its source is always MATRIX 2.
AUX 5 and 6 are fed to the first two eq’s.
MATRIX 1 is fed to the third eq.
left, right and/or mono are fed to the first three eq’s.
p.59
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master module
X-Four owner’s manual
5
module
block diagram
panel
p.60
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master module
5
matrix features
The X-Four includes two MATRIX mixes.Each of these outputs can be made
up of signals from the four GROUPS,left,right,mono and an external source.
left, right, and mono levels—MATRIX 1–2
These level controls are used to mix the left, right, and mono signals
into the corresponding MATRIX.
post-fader—left, right, and mono
These three post-fader switches determine whether the left, right and
mono MASTER faders have any effect on signals that available to MATRIX 1–2.
post-left, post-right, post-mono
The left, right and/or mono fader settings have no effect on the LEFT-,
RIGHT- and/or MONO-TO-MATRIX 1–2 level controls.
The left, right and/or mono faders are introduced into the signal
paths.
external input levels—MATRIX 1–2
These level controls are used to mix the external MATRIX input signals
into the corresponding matrix.The external MATRIX input connectors are
located on the rear-panel of the MASTER module.
p.61
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.62
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master module
5
matrix output features
master output levels—MTX 1–2
These are the MASTER output level controls for the MATRIX section.
They control the levels that appear at the corresponding MATRIX output
connectors on the rear-panel.
matrix 1–2 talkback—TALKTO
This switch adds the TALKBACK system output to the MATRIX outputs.
The level of the TALKBACK signal is set by the TALKBACK level control in the
MASTER section.
after-fader listen—AFL
Pressing this switch will include (illuminated) or exclude (not ilumi-
nated) MATRIX.
see—master module
p.63
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master module
X-Four owner’s manual
5
module
block diagram
panel
p.64
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master module
5
alternate out features
The ALTERNATE output section allows assignment of the left and right MASTER
signals (plus center—if LCR-TO-OUTPUTS is selected) to a separate pair of bal-
anced male XLR connectors on the rear-panel.
By utilizing the mode switches located below the ALT OUT level control,these
signals can be derived in a number of ways. In default mode (no switches
depressed), the post-fader left and right MASTER (in center) signals are rout-
ed through the ALT OUT level control and appear at the ALT OUT connectors.
alternate out level
This control sets the levels that appear at the ALT OUT left and right
balanced XLR connectors on the rear-panel.
sum mono
The main left and right (and mono/center) signals are summed
together as a mono signal.This signal is then routed through the ALT OUT
level control and appears at the left and right ALT OUT balanced male XLR
connectors on the rear-panel.
The main left and right (and mono/center) signals are routed in
stereo through the ALT OUT Level control and appear at the left and right
ALT OUT balanced male XLR connectors on the rear-panel.
pre switch
The left and right (and mono/center) master faders have no effect on
the left and right (and mono/center) signals routed through the ALT OUT
level control and appear at the left and right ALT OUT balanced male XLR
connectors on the rear-panel.
The left and right (and mono/center) master faders control the lev-
els of the left and right (and mono/center) signals routed through the ALT
OUT level control and appear at the left and right ALT OUT balanced male
XLR connectors on the rear-panel.
p.65
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.66
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master module
5
monitor output features
The MONITOR output section controls the audio feed for the console oper-
ator.Features are similar to those of ALT OUT section,except that the MON-
ITOR section is normally used to access the SOLO system as well as main
outputs.
Like the alternate output section, it provides the ability to assign the left
and right MASTER signals to a designated pair of balanced male XLR con-
nectors on the rear-panel.
By utilizing the mode switches located below the LOCAL MONITOR OUTPUT
level control, these signals can be derived in a number of different ways. In
default mode (no switches depressed),the post-fader left and right MASTER
signals are routed through LOCAL MONITOR level control and appear at the
MONITOR OUT balanced male XLR connectors on the rear-panel.
This feed is replaced by the SOLO signal when a SOLO is activated on the
console.
monitor-out level
see—alternate out
sum mono
see—alternate out
solo-off
When any of the AFL/PFL switches on the console are active, the
AFL/PFL audio is routed in stereo through the MONITOR OUT level control
and appears at the left and right MONITOR OUT balanced male XLR con-
nector on the rear-panel.
This setting overrides the left and right feed to the MONITOR output.
When any of the AFL/PFL switches on the console are active, the
MONITOR outputs are not affected.
headphone level
This control governs the level at the headphone jack located in the
front of the console under the arm rest.
p.67
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.68
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master module
5
left master features
signal/peak LED—SIG/PEAK
LED
This dual-color LED responds to the left pre-fader signal.It illuminates
green with varying brightness in proportion to the audio signal.When the
signal approaches clipping,either pre- or post-fader,the LED illuminates red.
talkback left/right—TALKTO
The TALKBACK system output is added to the left and right MASTER
outputs.The level of the TALKBACK signal is set by the TALKBACK level con-
trol in the MASTER section.
sum left/right—SUM L/R
The main left and right signals are summed together as a mono sig-
nal and appear at the left- and right-output balanced male XLR connectors
on the rear-panel.
The Main Left and Right signals appear in stereo at the left- and right-
output balanced male XLR connectors on the rear-panel.
left master fader
This fader governs the main left output level.
after-fader listen—AFL
When this switch is depressed,the left post-fader signal is sent to the
console solo system.
p.69
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.70
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master module
5
right master features
signal/peak LED—SIG/PEAK
LED
This dual-color LED responds to the right pre-fader stereo signal. It
illuminates green with varying brightness in proportion to the audio signal.
When the signal approaches clipping, either pre- or post-fader, the LED
illuminates red.
right—TALKTO
The TALKBACK system output is added to the left and right MASTER
outputs.The level of the TALKBACK signal is set by the TALKBACK level con-
trol in the MASTER section.
left/center/right—LCRTO MASTER
This feature is useful for monitoring the console when creating an LCR
mix. Local monitoring is usually done with one or two speakers.The LCR
to outputs feature combines the center (or mono) signal with the left and
right signals, creating a phantom center channel.This feature affects the ALT
OUT section, the MONITOR OUT section, the HEARING ASSIST output and the
headphone feed.
Center (mono) channel is not included in the MONITOR paths.
The center (or mono) channel is combined with left and right MON-
ITOR outputs.This makes it possible to hear the center channel without a
designated speaker.
right master fader
This fader governs the main right output level.
after-fader listen—AFL
When this switch is depressed, the right post-fader signal is sent to
the console solo system.
p.71
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.72
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master module
5
mono master features
signal/peak LED—SIG/PEAK
LED
This dual-color LED responds to the pre-fader mono signal.It illumi-
nates green with varying brightness in proportion to the audio signal.
When the signal approaches clipping, either pre- or post-fader, the LED
illuminates red.
talkback mono—TALKTO MONO
The TALKBACK system output is added to the mono MASTER output.
The level of the TALKBACK signal is set by the TALKBACK level control in the
MASTER section.
main left/ main right—L–RTO MONO
The MAIN left and right post-fader signals are summed together as a
mono signal and are routed to the mono bus.The summed left and right
signals automatically combine with any signals that are assigned directly to
the mono bus to make up the mono output.
The mono output consists exclusively of signals assigned directly to
the mono bus. Signals that appear at the MAIN left and right faders do not
appear at the mono output.
mono master fader
This fader governs the mono output level.
after-fader listen—AFL
When this switch is depressed, the mono post-fader signal is sent to
the console solo system.
solo on indicator
This LED will illuminate when the solo system is active.
p.73
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master module
X-Four owner’s manual
5
module
block diagram
panel
p.74
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master module
5
talkback features
The TALKBACK system provides facilities for assigning an external signal
(usually the console operator's microphone) to any of the console's out-
puts.Other signals can be routed through the TALKBACK system include the
tone oscillator or the built in PINK NOISE generator.
talkback level
This control sets the level that appears at any of the outputs with
their respective TALK TO switches engaged. It also governs the audio level
at the TALKBACK output XLR connector on the rear panel.
pink noise
The TALKBACK in-connector is disabled and PINK NOISE is sent though
the TALKBACK system.
talkback on—TALK ON
This switch must be activated for the TALKBACK system to operate.
There are two-ways to activate it:
1 Momentary - Depressing the button for more-than 1/2 of a second will
cause it to act as a momentary switch.When the button is released, the
TALKBACK section will be shut-off.
2 Toggle - A quick tap on the button (less-than 1/2 second) will cause the
switch to electronically change its state from on-to-off or from off-to-on.
p.75
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.76
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master module
5
rear panel features
left and right alternate output XLR’s
M
This pair of balanced male XLR connectors carries the left and right
ALT OUT signals.These outputs are controlled by the ALT OUT level control.
see—left and right alternate output, front-panel description
left and right monitor output jacks
This pair of ground compensated 1/4" TRS jacks carries the left
and right MONITOR signals.These outputs are controlled by the MONITOR
level control.
see—monitor, front-panel description
matrix 1–2 output XLR’s
M
Two balanced male-XLR connectors carry the MATRIX 1–2 output sig-
nals.These outputs are controlled by their respective MATRIX OUTPUT level
controls.
see—matrix, front-panel description
left, right and mono output XLR’s
M
This group of three balanced male-XLR connectors carries the left,
right and mono output signals.These outputs are controlled by the left,
right and mono output faders.
see—left, right, and mono masters, front-panel description
p.77
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master module
X-Four owner’s manual
5
block diagram
module
panel
p.78
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master module
5
rear panel features
insert points—left, right, and mono
Separate 1/4"TRS jacks provide the ability to insert external signal proces-
sor into the signal paths of the left, right and mono MASTERS.
insert sends—left, right, and mono
Plugging a 1/4" plug
into this jack does not
break the internal signal
flow of the respective left,
right, and mono masters.
+
These jacks connect to the input of signal processors.The sig-
nals are derived after the left, right and mono summing amplifiers.
Plugging a 1/4" plug
into this jack breaks
the signal flow
of the respective left, right,
and mono masters.
insert returns—left, right, and mono
+
These jacks connect to the outputs of a signal processors.They
can accept balanced or unbalanced signals.
DC power-in
This jack connects the power supply cable to the console.
p.79
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power supply
X-Four owner’s manual
8
model 5A power supply
master rear-panel
specifications
output power
+18V @ 5A DC
-18V @ 5A DC
+12V @ 4A DC
+48V @ 0.75A DC
two Hirose JR16RK-7S connectors on rear
connector meets JIS C 5432 standard
DC out recepticle
DC out cable
grey polyurethane outer jacket, 15 feet long
seven-way, 14-gauge stranded conductors
rated 600 volts, 80 degrees C
UL and CSA approved
Hirose JR16PK-7S and JR16PK-7P connectors fitted
90 to 250 volts @ 4.5 amps maximum
universal AC input voltage. No changes needed
0.5 amps idle
AC mains power supply
IEC 320 C-13 3-pin 15 amp recepticle
removable IEC type
AC mains recepticle
cable
with country-specific mains plug fitted
UL, CSA, and CE
approvals
chassis
two-space 19 inch rack mount unit
3.5 inches tall, 17 inches wide, 12 inches deep.
weight: 18 pounds
p.80
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power supply
8
power supply usage
supply identification
The type of power supply can be identified by the model number shown
on the back of the chassis and panel label.
power requirements
The X-Four power supplies have certain electrical requirements for proper
operation. If possible the power supply should be connected to a dedicated
circuit.Should any other appliance on the same circuit draw enough current
to overload the circuit,the breaker or fuse will trip causing loss of power to
the console.
Note the maximum cur-
a
rent draw specifications
at left.
Be sure that the circuit to
which you connect the sup-
ply can handle the draw.
The power switch on the supply front panel is also a circuit breaker;there
is no power fuse.Should the supply ever shut down,or trip at start up,sim-
ply push the switch to the off position and then push on again.
ground linking
SAFETY CONSIDERATIONS—each new power supply is shipped with the AC
third-wire ground connected to the console chassis ground.The connec-
tion is made at the rear of the power supply unit.This is necessary for safe-
ty reasons so that exposed metal parts are grounded. In the event of a live
conductor making contact with the console chassis or the power supply
chassis then the current will flow to ground without a safety hazard arising.
When the console is dis-
connected from the power
supply the chassis ground
connection to AC third-wire
ground is broken and safety
protection is lost.
a
Uninterruptible grounding—in a fixed installation for example,make a con-
nection directly to the console chassis from the safety ground.Disconnect
the ground link on the rear of the power supply.This disconnects console
ground from power supply AC third-wire ground which could possibly
create a hum-loop.
twin-supply operation
When twin-supplies are in use for automatic back-up, then the ground
links on both supplies should be fitted.
In a situation where the safety ground to the console chassis has been con-
nected and the ground path via the power supply is causing a hum-loop,
then disconnect the ground links on both power supplies.
p.81
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power supply
X-Four owner’s manual
8
model 5A power supply
master rear-panel
specifications
output power
+18V @ 5A DC
-18V @ 5A DC
+12V @ 4A DC
+48V @ 0.75A DC
two Hirose JR16RK-7S connectors on rear
connector meets JIS C 5432 standard
DC out recepticle
DC out cable
grey polyurethane outer jacket, 15 feet long
seven-way, 14-gauge stranded conductors
rated 600 volts, 80 degrees C
UL and CSA approved
Hirose JR16PK-7S and JR16PK-7P connectors fitted
90 to 250 volts @ 4.5 amps maximum
universal AC input voltage. No changes needed
0.5 amps idle
AC mains power supply
IEC 320 C-13 3-pin 15 amp recepticle
removable IEC type
AC mains recepticle
cable
with country-specific mains plug fitted
UL, CSA, and CE
approvals
chassis
two-space 19 inch rack mount unit
3.5 inches tall, 17 inches wide, 12 inches deep.
weight: 18 pounds
p.82
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power supply
8
power supply usage
console and power supply grounding
Console chassis ground is electrically connected to:the audio ground,pin-
1 of XLR connectors, the sleeves of 1/4” sockets,and to the terminal CON-
SOLE GROUND at the rear of the power supply.
This connection should
The AC third-wire connection in the power supply cable connects the
metal chassis of the power supply to safety ground.
a
never be disturbed.
Hazardous voltages exist
inside the power supply
which require the case to
be grounded.
Rack-mounting—the power supply ground may transfer to the rack case
through the front fixing screws, though this connection is not reliable.
Sound system use—the grounding requirements may call for the ground
link to be disconnected.This is permissible only when an alternative ground
path has been provided.If in doubt seek the advice of an experienced elec-
trical engineer.
redundant power supplies
The console power supply can be considered the single most important
component in an entire sound system.If a power amplifier,a signal proces-
sor or a console input goes down in the middle of a show, the show can
still go on. But if the console loses its power supply, the show is over. For
this reason, it is always good practice to incorporate redundant power
supplies for mixing consoles used in professional sound reinforcement
applications.
This should be considered a high priority even when using a very reliable
power supply. In even the most carefully designed sound systems, each
component runs the risk of failure at sometime or another.
The use of redundant
power supplies is
+
CrestAudio uses two methods for attaching redundant power supplies to
consoles. In both methods, the two (or more) power supplies should be
kept on while the console is in use to insure a smooth transition in the
event that one shuts off.
probably the single biggest
step that can be taken in
reducing or eliminating the
chance of a cancelled per-
formance due to system
failure.
If one power supply drops in voltage or shuts off completely,the other unit
takes over without any interruptions or audible glitches.As an added pre-
caution,the two (or more) power supplies can be fed by separateAC lines.
This will guarantee that the console does not shut off if one of theAC lines
goes down.
multiple power supplies in-series
Crest Audio X-Series consoles use this method for backup. Since each
power supply includes voltage switching circuitry,more than two units can
be hooked up in series. A DC link cabel ties the power supplies together.
p.83
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v. 1.0
D7000011 10/12/99
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