Applications; Basic Adjustment Of The Input Channels - Monacor MPX- 52 PA Mode D'emploi

3 Applications

The MPX-52PA is suitable for general profes-
sional PA applications . This mixer for two PA
zones allows connection of up to four units
with line level (e . g . CD/ MP3 player), two turn-
tables and five microphones . These can be
mixed via five independent input channels to
the two stereo output channels . The unit has
an automatic talkover function which atten-
uates the level of the music to an adjustable
extent when microphone announcements
are made .
The mixer is designed for installation into
a rack for units with a width of 482 mm (19") .
For installation, 3 rack spaces = 133 mm are
required . However, the mixer can also be set
up as desired .
4 Connection
Switch off the mixer prior to making or
changing any connections .
1) Connect the stereo audio sources to the
corresponding RCA input jacks of channels
CH 1 to CH 4 (white jack L = left channel;
red jack R = right channel):
– units with line level output (e . g .
CD/ MP3 player, radio, mixer) to the
jacks LINE (29);
– turntables with magnetic system to
the jacks PHONO (30) . Set the selector
switch MIC / PHONO (31) of the corre-
sponding channel to position PHONO .
Connect the ground connections of
the turntables to the clamping screw
GND (25) .
A stereo signal source with balanced out-
puts may also be connected to the XLR
jacks (33) of channel CH 1 . The balanced
connection of a signal source offers a bet-
ter protection against interference which
may occur especially with long connection
cables .
2) Connect microphones which may also be
operat ed alternately with the stereo sig-
nal sources at the input channels CH 1 to
CH 4 to the combined XLR / 6 .3 mm jacks
(32) . It is in general possible to connect
microphones with balanced or unbal anced
output . If a microphone is connected to
the channel CH 3 or CH 4, set the selec-
tor switch MIC / PHONO (31) of the corre-
sponding channel to position MIC .
Connect a microphone for announce-
ments at the input channel MIC to the
combined XLR / 6 .3 mm jack (6) or as an al-
ternative to the jack (34) on the rear panel .
Note: The signal of the input channel MIC will not
be available at the recording outputs REC (28) .
3) For connecting power amplifiers, two
stereo outputs each are available for PA
zones ZONE 1 and ZONE 2: a balanced
XLR output (26) and an unbalanced RCA
output (27) .
Instead of amplifiers, it is also possible
to connect other subsequent units with
line input level to the outputs, e . g . a sec-
ond mixer .
8
4) For recordings, a stereo output [pair of
RCA jacks (28)] is available for each of
the two PA zones ZONE 1 and ZONE 2;
at this output, the mixed signal of the
corresponding zone is always available in
stereo and independent of the adjustment
of the output fader .
Instead of recorders, it is also possible to
connect other subsequent units with line
input level to the outputs, e . g . a second
mixer .
5) For prefader listening of the input chan-
nels CH 1 – CH 4 and for monitoring the
two output channels ahead of the faders
(22), stereo headphones (with a minimum
impedance of 32 Ω) can be connected to
the 6 .3 mm jack PHONES (4) .
6) For illuminating the console, a gooseneck
light (12 V, max . 0 .75 W) may be connect-
ed to the BNC jack LAMP (1), e . g . the light
GNL-204 . The light is switched on and off
with the mixer .
7) Finally connect the plug of the mains
cable (23) to a socket (230 V/ 50 Hz) .
5 Operation
Prior to switching on, set the faders of the
output channels (22) to minimum to prevent
switching noise . Switch on the mixer with the
POWER switch (2) . The power LED above the
switch lights up .
CAUTION Never adjust the audio system
or the headphones to a very
high volume . Permanent high
volumes may damage your
hearing!
Your ear will get accustomed to high vol-
umes which do not seem to be that high
after some time . Therefore, do not further
increase a high volume after getting used
to it .
After operation, switch off the mixer with the
POWER switch .
5.1 Basic adjustment of the
input channels
First set all gain controls (9) to the left stop
and all equalizers (8) to mid-position .
If an input channel CH 1 to CH 4 is not
used, set its fader (15) to minimum . If the
microphone channel MIC is not used, set the
switch (5) to position OFF to switch off the
microphone .
5.1.1 Level control of the input
channels CH 1 to CH 4
For level control of an input channel:
1) Use the input selector switch (10) of the
channel to select the desired audio source .
2) Feed an audio signal (e . g . music piece)
to the input; with connection of a micro-
phone, talk into the microphone .
3) Use a screwdriver to adjust the GAIN con-
trol (9) at the input channel in such a way
that the LED indicator PEAK / SIGNAL (11)
shows green at average volumes and only
occasionally shows red at level peaks . If
the LED shows red more frequently, the
channel is overloaded . In this case, slightly
turn back the GAIN control or reduce the
output level of the corresponding audio
source or increase the distance to the mi-
crophone .
5.1.2 Level control of the microphone
channel MIC
1) To switch on the microphone, set the
switch (5) to position ON AIR .
2) Speak into the microphone . Adjust the
GAIN control (9) of the microphone chan-
nel in such a way that the LED PEAK / SIG-
NAL (11) shows green at average speech
volumes and only occasionally shows red
at level peaks . If the LED shows red more
frequently, the channel is overloaded .
In this case, slightly turn back the GAIN
control or increase the distance to the mi-
crophone .
In case of acoustic feedback (loud howl-
ing), slide the fader (16) downward .
3) Use the 3-way equalizer (8) to adjust the
sound of the channel . To check the sound,
assign the microphone channel to an out-
put channel and advance the volume con-
trol (16) as described in chapter 5 .2 so that
it is possible to hear sound changes via the
amplifier system or headphones (
ter 5 .4) . The HIGH frequencies and LOW
frequencies can be boosted or attenu ated
up to 15 dB as a maximum, the MID fre-
quencies up to 12 dB as a maximum . If
required, re adjust the input amplification
with the gain control .
5.2 Adjustment of the
output channels
1) Assign the input channels with the buttons
Z 1 and Z 2 (14) respectively to the two
output channels as desired:
button Z 1 pressed:
input channel switched to channel
ZONE 1
button Z 2 pressed:
input channel switched to channel
ZONE 2
2) Advance the fader of the desired input
channel . To mix multiple audio sources to
a single output channel, use the volume
controls (15, 16) of the corresponding
input channels to adjust the volume ratio
of the different audio sources .
3) To adjust the level of the output channels,
use the appropriate volume control (22)
and observe the respective level indicator
(19) . Usually, the level is best when the
level indicator shows values in the 0 dB
range . However, if the output level is too
high or too low for the subsequent unit,
the output level must be correspondingly
adjusted to a lower or higher value . When
the output is overloaded, the red LED indi-
cator "+9" will light up . In this case, slide
down the fader correspondingly . The sig-
nal at the recorder outputs REC (28) are
independent of the volume adjusted for
the output channels .
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