Basic Adjustment Of The Input Channels; Monitoring Via Headphones - Monacor MPX-4PA Mode D'emploi

level to the master outputs, e . g . a sound re-
corder or a second mixer .
4) For prefader listening to the stereo input chan-
nels or for monitoring the three master channels
ahead of the master level controls, connect ste-
reo headphones (minimum impedance 8 Ω) to
the 6 .3 mm jack PHONES (4) .
5) For illuminating the console, connect a goose-
neck light (12 V / 0,75 W max .) to the BNC jack
LAMP (1), e . g . the light GNL-204 . The light is
switched on or off with the mixer .
6) Finally connect the plug of the mains cable (26)
to a mains socket (230 V / 50 Hz) .
5 Operation
Prior to switching on, set the master level con-
trols (24) to minimum to prevent switching noise .
Switch on the mixer with the switch POWER (2) .
The power LED above the switch lights up .
CAUTION Never adjust the audio system or
the headphones to a very high vol-
ume . Permanent high volumes may
damage your hearing!
Your ear will get accustomed to high volumes
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
switch POWER .
5.1 Basic adjustment of the input channels
First set all gain controls (7, 15), all tone controls
(8, 21) and the controls BAL (9, 22) to mid-posi-
tion . Set the switches PAD (6) of the microphone
channels to the upper position .
If a stereo input channel is not used, set its
fader (18) to minimum . If a microphone channel is
not used, unlock the button MIC ON (12) to switch
off the microphone .
5.1.1 Level control of the stereo channels 1 to 4
For level control of a stereo input channel:
1) Use the input selector switch (14) of the channel
to select the desired audio source .
2) Feed an audio signal (e . g . music piece) to the
input .
3) Set the fader (18) of the channel to approx . 2/3
of its maximum (e . g . to position 7) .
4) Use one of the three routing buttons (19) to
switch the input channel to the master channel
which is to be used for level control (button
Z 1 for ZONE 1, button Z 2 for ZONE 2, button Z 3
for ZONE 3) . The LED above the button lights up .
5) Set the level control (24) of the master channel
used to approx . 2/3 of its maximum .
6) Use the gain control (15) to control the input
channel to an optimum level by means of the
level indication (20) of the master channel used .
Adjust the gain control in such a way that, at
average volume, the level indication displays
values in the 0 dB range . If the red LEDs light up,
there is overload at the channel . If required, the
control can be fully opened or closed .
The LED PEAK (17) of the input channel is
also useful for controlling the level . It should not
light up or light up only briefly with signal peaks .
If it lights permanently, reduce the level of the
input signal [by reducing the input amplification
(gain) or the output level of the corresponding
audio source] .
5.1.2 Level control of the microphone channels
1) To switch on the corresponding microphone,
press the button MIC ON (12) of the channel
(LED above the button lights up) .
2) Set the control LEVEL (11) of the channel to
approx . 2/3 of its maximum (e . g . to position 7) .
3) Use one of the three routing buttons (13) to
switch the microphone channel to the master
channel which is to be used for controlling
the level (button Z 1 for ZONE 1, button Z 2 for
ZONE 2, button Z 3 for ZONE 3) . The LED above
the button lights up .
Note: The assignment via the routing buttons al-
ways applies to both microphone channels .
4) Set the level control (24) of the master channel
used to approx . 2/3 of its maximum .
5) Speak into the microphone . Adjust the gain con-
trol (7) of the channel in such a way that the
level indication (20) of the master channel used
displays values in the 0 dB range (if required, the
control can be fully opened or closed) .
In case of howlback (loud whistling) or if
the input level is too high even with the gain
control closed, set the PAD switch (6) of the
channel to the lower position: The input level
will be attenuated by 15 dB .
6) Adjust the sound with the 2-way tone control
(8) of the channel: The high frequencies (TREB)
and low frequencies (BASS) can be attenuated
or boosted up to 12 dB max . Readjust the chan-
nel level with the gain control afterwards, if
required .
7) With the control BAL (9), place the microphone
signal on the stereo base as desired .
5.2 Adjustment of the master channels
1) Use the routing buttons Z 1 to Z 3 [routing but-
tons (13) for both microphone channels and
routing buttons (19) separately for each stereo
channel] to assign the input channels to the
three master 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
button Z 3 pressed: input channel switched to
channel ZONE 3
2) For mixing several audio sources to a master
channel, adjust the desired volume ratio of the
audio sources to one another with the level con-
trols (11, 18) of the corresponding input chan-
nels: Control the audio sources to be played at
the highest volume to an optimum level (see
chapters 5 .11 and 5 .1 .2) and reduce the levels
of the other audio sources accordingly .
3) Via its level indication (20), control the level of
each master channel with the master level con-
trol (24) . Usually, an optimum level is obtained
when the level indication displays values in the
0 dB range . However, if the output level is too
high or too low for the following unit, the mas-
ter signal must be controlled to a correspond-
ingly lower or higher level .
4) In each master channel, use the 3-way equalizer
(21) to attenuate or boost the high frequencies
(TREB), midrange frequencies (MID) and low fre-
quencies (BASS) as desired (±12 dB max .) . Sound
adjustments affect the level; it may be necessary
to readjust the master level afterwards .
5) Adjust the balance for each master channel with
the control BAL (22) .
6) Each master channel can be switched to mono
with the STEREO / MONO selector switch (23)
[button pressed] . In this case, the mono signal
can be taken off at both jacks of the corre-
sponding master output . This will allow op-
eration with two mono power amplifiers, for
example .
5.3 Talkover
When making an announcement while a music pro-
gramme is played, switch on the talkover function
for the microphone at channel MIC 1 with the but-
ton TALKOVER (10) to improve the audibility of the
announcement: When the button is pressed (LED
above it lights up), the levels of the stereo channels
1 to 4 are automatically attenuated by 16 dB while
announcements are made via the microphone .
Disengage the button to switch off the function .
Note: The level attenuation always affects all three
master channels even if the microphone channel MIC 1
has not been assigned to all master channels via the
routing buttons Z 1 to Z 3 (13) .

5.4 Monitoring via headphones

The PFL function (prefader listening) allows you to
monitor each of the stereo input channels 1 to 4
via headphones connected to the jack PHONES (4),
even if the corresponding fader (18) is set to min-
imum . This will allow you, for example, to select
the desired title on a CD or to time the moment
for fading in an audio source .
Alternatively, it is also possible to monitor
each individual master channel ahead of its level
control (24) .
1) For prefader listening to an input channel, press
the button PFL (16) of the channel (LED above
the button lights up) .
For monitoring a master channel ahead of
the master level control, press the button PFL (25)
of the channel (LED above the button lights up) .
2) Adjust the desired headphone volume with the
control PHONES (3) .
6 Specifications
2 microphone inputs, mono
Sensitivity: � � � � � � � � � � � 1,5 mV
Connection, front panel: � XLR (bal�)
Connection, rear panel: � � 6�3 mm jack (bal�)
2 phono inputs, stereo
Sensitivity: � � � � � � � � � � � 3 mV
Connection: � � � � � � � � � � RCA (unbal�)
6 line inputs, stereo
Sensitivity � � � � � � � � � � � � 150 mV
Connection: � � � � � � � � � � RCA (unbal�)
Master outputs (Z 1 to Z 3), stereo
Rated level: � � � � � � � � � � 1 V
Connection: � � � � � � � � � � XLR (bal�), RCA (unbal�)
Headphone output, stereo
Headphone impedance: � 8 Ω min�
Connection: � � � � � � � � � � 6�3 mm jack
Frequency range: � � � � � � � � 20 – 20 000 Hz
THD: � � � � � � � � � � � � � � � � � 0�1 %
S / N ratio: � � � � � � � � � � � � � 61 dB, unweighted
Equalizer / microphones
2 × low frequencies: � � � � ±12 dB / 50 Hz
2 × high frequencies: � � � ±12 dB / 10 kHz
Master equalizer
3 × low frequencies: � � � � ±12 dB / 50 Hz
3 × midrange frequencies: ±12 dB / 1 kHz
3 × high frequencies: � � � ±12 dB / 10 kHz
Talkover: � � � � � � � � � � � � � � attenuation 16 dB
Connection for light: � � � � � 12 V / 0�75 W max�, BNC
Ambient temperature: � � � � 0 – 40 °C
Power supply: � � � � � � � � � � 230 V / 50 Hz
Power consumption: � � � � � 20 VA
Dimensions: � � � � � � � � � � � 482 × 105 × 177 mm, 4 RS
Weight: � � � � � � � � � � � � � � � 4 kg
Subject to technical modification .
All rights reserved by MONACOR ® INTERNATIONAL GmbH
& Co. KG. No part of this instruction manual may be repro­
duced in any form or by any means for any commercial use.
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