Crest Audio X-Four User manual

owners manual
X-Four mixing console

X-Four owner’s manual
block diagram
Σ
OFF
Ø
R
L
1 3
SOLO
OFF
SOLO
AUDIO
ON
MONITOR OUT
SOURCE SELECT
POST / PRE FADER
LR
LR
FROM
SOLO
LOGIC
SCL+
HP
LEVEL
X-Four Block Diagram
SCL-
+10
+10
PEAK
LO MID
Σ Σ Σ Σ Σ Σ Σ
Σ
NO
+10
L
R
2
4
4
1
3

1
2
3
4
5
group p. 41
master p. 57
power supply p. 81
stereo inputs p. 25
mono inputs p. 7
table of contents

X-Four owner’s manual

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
indicators
tips
see
see—references other sections of the manual containing
supplementary information on the current topic or a related issue
Prefered methods.
Helpful hints.
Feature insights.
+
Procedures not to attempt.
Issues or hazards to keep
in mind when operating
the equipment.
a
What to look
for on-screen.
Alerts, indicators, or
prompts that may appear.
®

p. 6
X-Four owner’s manual
mono input module
module panel
legend
block diagram
1

p. 7
mono input module
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.
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.
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.
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.
polarity inverted
polarity not inverted
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.
+
If the 48V phantom
power switch is
engaged, depressing this
switch disconnects phantom
power from the mic input
XLR.
+
1
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.
+
The 48V switch should
not be engaged when
using standard (dynamic)
microphones, or other
sources that do not use
phantom power.
a

p. 8
X-Four owner’s manual
mono input module
module panel
legend
block diagram
1

p. 9
mono input module
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 PAD—switch-up
15 to 75dB of gain can be added the mic-input signal.
The impedance at the input XLR is 4kΩ.
LINE—switch-up PAD—switch-down
-5 to 55dB of gain can be added to the mic-input signal.
The impedance at the input XLR is 4kΩ.
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
1
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.
+

1
p. 10
X-Four owner’s manual
mono input module
module
legend
block diagram panel