Applications; Setting The Mixer Into Operation - Monacor International IMG STAGELINE MPX-20USB Mode D'emploi

MPX-20USB
Order No. 20.2860
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3-Channel Audio Mixer
These instructions are intended for users without
specific technical knowledge. Please read these in-
structions carefully prior to operating the unit and
keep them for later reference.

1 Applications

The audio mixer MPX-20USB is suitable for any profes-
sional or private DJ applications. It is equipped with two
stereo input channels and a DJ microphone channel.
Headphones can be connected for prefader listening to
the input signals.
A USB audio interface is provided for connection to
a computer. The USB audio interface can be used both as
an output for digital recording of the audio mix and as an
input for feeding in audio data.
When the mixer is connected to a computer, the
power is supplied via the USB connection. If no computer
is used, a power supply unit with USB connection will be
required.
2 Important Notes
The unit corresponds to all relevant directives of the EU
and is therefore marked with .
•
The unit is suitable for indoor use only. Protect it against
dripping water and splash water, high air humidity and
heat (admissible ambient temperature range: 0 – 40 °C).
•
For cleaning only use a dry, soft cloth; never use water
or chemicals.
•
No guarantee claims for the unit and no liability for
any resulting personal damage or material damage will
be accepted if the unit is used for other purposes than
originally intended, if it is not correctly connected or
operated, or if it is not repaired in an expert way.
If the unit is to be put out of operation defini-
tively, take it to a local recycling plant for a dis-
posal which is not harmful to the environment.

3 Setting the Mixer into Operation

To prevent disturbing noise during connection / discon-
nection and an excessive volume when setting the mixer
into operation, set the fader MASTER (15) and the control
PHONES (18) to minimum.
1) Connect the audio sources to the appropriate input
jacks (2 and 3):
– Jacks LINE for the connection of units with line level
(e. g. MP3 / CD player)
– Jacks PHONO for the connection of turntables with
magnetic system; connect the ground cable of the
turntable (if available) to the ground screw GND (1).
Two audio sources can be connected to each of the
input channels CH 1 and CH 2. To switch be tween the
audio sources, use the appropriate selector switches
(6 and 8).
2) A microphone can be connected to the jack MIC (17).
3) To monitor the input signals, connect stereo head-
phones (minimum impedance: 8 Ω) to the jacks
PHONES: 3.5 mm jack (19) or 6.3 mm jack (20).
4) The sum signal adjusted by means of the fader MAS-
TER (15) is available at the stereo outputs MASTER and
REC (4). These outputs can be used to connect the am-
plifier for PA applications and, for example, a recorder.
5) When operated without a computer, the mixer must
be supplied with power by means of a power supply
unit that is equipped with a USB connection and that
provides an output voltage of 5 V ⎓ and an output
current of 500 mA (e. g. the model PSS-1005USB from
MONACOR). Use the USB cable provided to connect
the power supply unit to the USB port (5), and then
connect the power supply unit to a mains socket. Once
the power supply has been connected, the mixer will
be switched on and the LED indicator ON (11) will
light up.
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3.1 Operating the mixer with a computer
To operate the mixer with a computer, the audio soft-
ware supplied with the operating system or additionally
installed audio software may be used.
1) Start the computer and connect the USB port (5) to the
USB connection of the computer, using the USB cable
supplied. The computer will recognize the switched-on
mixer as a USB audio unit for audio input and audio
output.
Note: If the mixer is not recognized as a USB audio unit, install
the required drivers (default drivers of the operating system),
e. g. by means of the original CD of the operating system.
If necessary, restart the computer after installing the drivers.
2) Call up the reproduction / recording program used and
make the adjustments required for audio reproduction
via the mixer and / or audio recording from the mixer
( manual of the program). The mixer can then be
☞
operated as described in chapter 4.
If no audio recording or audio reproduction is possible,
check in the system settings of the computer if the USB in-
terface has been selected for audio input or audio output.
Hint: If the mixer is connected to both a computer and to units
that are earthed via their mains cable (e. g. amplifiers), hum in-
terference may occur due to ground loops. To eliminate the hum
interference, connect the mixer to the respective unit by means
of a ground isolator (e. g. FGA-40 from MONACOR).
4 Operation
1) Use the switches LINE / PHONO (6 and 8) to select the
signal sources for the input channels CH 1 and CH 2.
2) Use the button USB TO CH 2 (7) to define the input
signal that is to be sent to channel CH 2:
Button disengaged = input signal of the RCA jacks
INPUT 2 (3)
Button pressed = input signal of the USB port (5)
Note: Please note that there is a risk of feedback with
recordings via the USB port when the recording signal of the
computer is sent as an input signal to channel CH 2.
3) To make the basic adjustment, first open the fader
MASTER (15) to approximately 2⁄3 of its maximum.
4) Slide the crossfader (16) to the left stop and feed an
audio signal to channel CH 1. Use the fader (10) to
control the level of the channel. The output level is
indicated by the signal LEDs (12). The red LEDs +3 dB
should only light up briefly for level peaks. If they light
up permanently, close the fader accordingly.
5) Slide the crossfader to the right stop and adjust chan-
nel CH 2 in the same way. Then the crossfader can be
used to crossfade between channels CH 1 and CH 2.
To mix the signals of the two channels, slide the cross-
fader to its mid-position.
6) To adjust the definite volume of the output signal at
the jacks OUTPUT (4) and at the USB port (5), use the
fader MASTER, making sure that no distortions occur.
7) Use the fader MIC (9) to adjust the volume for an-
nouncements via a microphone connected to the jack
MIC (17).
8) The input channels CH 1 and CH 2 can be separately
monitored using headphones, even if a channel has
been faded out with the crossfader. Thus, it is possible
to choose the next title to be played, for example. Use
the button PFL (13) to select the channel:
Button disengaged = CH 1
Button pressed = CH 2
Use the control PHONES (18) to adjust the volume of
the headphones.
WARNING! Never adjust the audio system and the head-
phones to a very high volume. Permanent high volumes
may damage your hearing! Your ear will get accustomed
to high volumes which do not seem to be that high any
more after some time. Therefore, do not further increase
a high volume after getting used to it.
MONACOR INTERNATIONAL GmbH & Co. KG • Zum Falsch 36 • 28307 Bremen • Germany
Copyright by MONACOR INTERNATIONAL. All rights reserved.
©
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5 Specifications
Inputs
(sensitivity/ impedance)
MIC: . . . . . . . . . . 1 mV/ 1 kΩ
PHONO: . . . . . . . . . 9 mV/ 63 kΩ
LINE: . . . . . . . . . . 450 mV/ 17 kΩ
Output level
MASTER, REC:. . . . . . 1 V
Headphone impedance: . . . . ≥ 8 Ω
USB interface: . . . . . . . . . . . USB 2.0, port type B
Frequency range: . . . . . . . . . 20 – 20 000 Hz
THD: . . . . . . . . . . . . . . . . . . < 0.1 %
S / N ratio: . . . . . . . . . . . . . . . 63 dB (unweighted)
Power supply: . . . . . . . . . . . . 5 V ⎓ / 500 mA
via USB interface
Dimensions: . . . . . . . . . . . . . 150 × 70 × 140 mm
Weight: . . . . . . . . . . . . . . . . 700 g
Suitable operating system
for USB operation: . . . . . Windows 2000, Windows XP,
Windows Vista, Windows 7,
Mac OS X
Windows is a registered trademark of Microsoft Corporation in the
USA and other countries.
Mac OS is a registered trademark of Apple Computer, Inc. in the USA
and other countries.
Subject to technical modification.
1
2 3 4
MPX-20 USB
6 7
ON USB
OFF TO CH2
LINE 1 PHONO 1
ON
11
10
9
8 +3 dB
7
L R
10
6
–3 dB
5
12
4
3
9
2
1 CH 1
PFL
CH 2
0
13
MIC CH 1 CROSSFADER
16
MIC
MIN MAX
17 18
A-1486.99.02.01.2016
ELECTRONICS
5
8
LINE 2 PHONO 2
10
9
8
7
6
5
15
4
14 3
2
1
0
CH 2 MASTER
PHONES
19 20