Before Operation - IMG STAGELINE MMX-24USB Manual De Instrucciones

3 Applications
This audio mixer is designed for universal
PA and recording applications . It features 2
(MMX-24USB) or 4 (MMX-44) mono input
channels and 4 stereo input channels to con-
nect microphones (also phantom-powered
microphones) and audio sources with line
output level (e . g . musical instruments, play-
ers) . A send way allows for use of an effect
unit . In addition, connections for a recorder
are available . Audio mixing can be monitored
by means of headphones and / or a monitor
system in a separate control room .
Model MMX-24USB additionally features a
USB audio interface to connect a computer .

4 Before Operation

Prior to connecting / disconnecting and prior
to switching on, always set the output con-
trols BOOTH / PHONES (23) and MASTER (16)
to minimum .
4.1 Connecting audio sources
Since it is not possible to switch over between
the inputs in the mono channels, either use
the microphone input (1) or the line input (2);
never use both inputs at the same time .
4.1.1 Microphones
Connect microphones to the balanced XLR
jacks MIC (1) . For phantom-powered micro-
phones, press the button PHANTOM 48 V (22)
to activate a joint 48 V phantom power for
all XLR jacks . When the phantom power has
been activated, the LED next to the button
will light up .
Caution: When the phantom power has
been activated, do not connect any micro-
phone with unbalanced output; it may be
damaged .
To prevent switching noise in the speak-
ers and the headphones, only activate or
deactivate the phantom power when the
mixer has been switched off or when the
corresponding output controls have been
set to minimum .
4.1.2 Line audio sources
Connect audio sources with line signal level
(e . g . receivers of wireless microphone sys-
tems, effect units, musical instruments, play-
ers) to the 6 .3 mm jacks LINE (2) of the input
channels . The jacks are balanced . However,
to connect units with unbalanced output, use
2-pole 6 .3 mm plugs .
– Connect mono units to the mono channels
CH 1 and CH 2 (MMX-24USB) or CH 1 to
CH 4 (MMX-44) .
– Connect stereo units to the stereo channels
CH 3 /4 to CH 9/10 (MMX-24USB) or CH 5 / 6
to CH 11 / 12 (MMX-44) . To connect a mono
* for model MMX-24USB only
8
unit to a stereo channel, only use the jack L;
the mono signal will then internally be sent
to the right and the left channels .
If no recorder is connected to the RCA input
TAPE IN (17) ( chapter 4 .3), this input is
☞
available for an additional stereo unit with
line level (e . g . a CD player for background
music during intervals) .
4.2 Connecting an effect unit
Via the send way, signal parts can be decou-
pled from the input channels, routed via an
effect unit and then, after being processed,
added to the sum signal . The signal will be
picked up after the control LEVEL (10) of the
corresponding input channel .
1) Connect the input of the effect unit via
a 6 .3 mm plug to the mono output AUX
SEND (13) .
2) Connect the output of the effect unit to
the LINE input (2) of an input channel not
used, please refer to chapter 4 .1 .2 .
4.3 Connecting a recorder
A stereo recorder, e . g . a tape recorder, can
be connected to the RCA jacks TAPE IN (17)
and TAPE OUT (18):
1) Connect the reproduction output of the
recorder to the input TAPE IN .
2) Connect the recording input of the re-
corder to the output TAPE OUT; the output
will receive the sum signal adjusted with
the control MASTER (16) .
The RCA jacks can also be used for other
units with line signal level; it is, for example,
possible to connect a player (e . g . CD player
or MP3 player) to TAPE IN or an additional
amplifier to TAPE OUT .
4.4 Connecting a monitor system
and headphones
The audio mix, the input signal of the jacks
TAPE IN (17) and of the USB port (28)* or the
effect way can be monitored via stereo head-
phones and / or a monitor system in a sepa-
rate control room . Connect the headphones
(minimum im pedance 8 Ω) to the 6 .3 mm jack
PHONES (14) . Connect the amplifier of the
monitor system to the stereo output BOOTH
OUT (12); the two 6 .3 mm jacks of the output
are unbalanced .
4.5 Connecting an amplifier
The stereo output MASTER OUT (11) receives
the sum signal adjusted with the control
MASTER (16) . At this output, the amplifier for
PA applications can be connected (or another
unit with line input, e . g . a second mixer) . The
6 .3 mm jacks are unbalanced .
4.6 Power supply/
Switching on and off
Connect the power supply unit provided to
the power supply jack (26) on the rear panel
and to a mains socket (230 V/ 50 Hz) .
To switch on the mixer, set the POWER
switch (27) to ON; to switch it off, set the
switch to OFF . When the mixer is switched
on, the power LED (24) will light up .
Note: Always disconnect the power supply unit from
the socket when the mixer is not in use for a longer
period of time; even when the mixer has been switched
off, the power supply unit will consume some power .
4.7 Operation with a computer*
Via the USB port (28), audio data can be trans-
ferred in both directions between the mixer
and the computer, even at the same time:
– When the USB port is used as an input, data
fed in via the USB port can be added to the
sum signal and monitored via headphones /
monitor system in a control room .
– When the USB port is used as an output, the
USB port provides the sum signal adjusted
with the control MASTER (16) .
To operate the mixer with a computer, either
use the audio software supplied with the
operating system or audio software installed
additionally . Various audio software programs
for recording and reproduction are available
on the Internet free of charge .
1) Start the computer and connect the USB
port of the mixer to a USB connection on
the computer .
2) The computer will recognize the
switched-on mixer as a USB audio device
for audio input and audio output . The
required drivers (de fault drivers of the
operating system) are available on the
computer .
Note: If not all drivers required are available on
the computer, install them, e . g . by means of the
original CD of the operating system . If necessary,
restart the computer after installing the drivers .
3) Call up the audio program used, make the
settings required for audio reproduction
via the mixer or audio recording from the
mixer ( ☞ manual of the program) . The
mixer can then be operated as described
in chapter 5 .
If no audio recording or audio reproduction
is possible, check the system settings of the
computer to find out if the USB interface has
been selected for audio input or audio output .
Hint: If the mixer is connected to both a computer and
to units earthed via their mains cable (e . g . amplifiers),
hum interference may occur due to ground loops . To
eliminate this interference, use a ground isolator (e . g .
FGA-102 or FGA-202 from IMG STAGELINE) to connect
the mixer to the corresponding unit .