Computer; Headphones / Control Room; Monitor System; Monitor System For Musicians - IMG STAGELINE MMX-842USB Manual De Instrucciones

4.4 Computer

GB
Via the USB jack (50) the audio data can be
transmitted in both directions between mixer and
computer:
– Use as an input:
The data fed in via the USB jack can be
switched to the MAIN MIX sum [
2-TR / USB TO MAIN (40)] and be monitored
via headphones / control room monitor system
[ button 2-TR / USB (28)].
– Use as an output:
The USB jack sends the MAIN MIX sum sig-
nal.
Note about the full duplex operation: During a
recording via the USB jack it is possible to monitor the
input signals of the USB jack via headphones or a
control room monitor system (e. g. to check the
recording). However, it is not possible at the same
time to switch input signals of the USB jack to the
MAIN MIX sum and to make a recording via the USB
jack, as the USB jack does not send an output signal
as soon as the button 2-TR / USB TO MAIN (40) is
engaged.
1) Boot up the computer and switch on the mixer
via the POWER switch (48).
2) Connect the USB jack (type B) via a USB
cable (e. g. USB-203AB from MONACOR) to
a USB port at the computer. After connection,
the USB interface is recognized as an exter-
nal USB unit, depending on the operating
system e. g. as "USB Audio CODEC" or "USB
Audio Device". The required drivers (stan-
dard drivers of the operating system) are
automatically installed.
Note: If not all drivers required are available on the
computer, they have to be installed, e. g. via the
original CD of the operating system. If necessary,
restart the computer after the installation.
3) Call the reproducing / recording program used
and make the required adjustments for the
audio reproduction via the mixer or audio
recording from the mixer (
program). The mixer can be operated accord-
ing to chapter 5.
If no sound can be heard, check the following
audio adjustments of the operating system of the
computer:
– audio input and output must be correctly
assigned:
For data transmission from the computer to
the mixer the USB interface of the mixer must
be selected as the device for playback (device
for the audio output).
For data transmission from the mixer to the
computer the USB interface of the mixer
must be selected as the device for recording
(device for the audio input).
– The sound must be switched on.
– The corresponding volume controls must not
be set to minimum.
Hint: If the mixer is connected to a computer and to
units which are earthed via their mains cable (e. g.
amplifier), hum interference may occur due to ground
loops. To eliminate them, the mixer may be connected
via a ground separator (e. g. FGA-102 or FGA-202 from
the product range of "img Stage Line") to the respective
unit.
4.5 Headphone / control room

monitor system

Via stereo headphones and/or via a monitor sys-
tem in a separate control room it is possible to
monitor:
– the input channels ("PFL" and "SOLO" modes)
– the Aux send ways
– the input signal of the jacks CD / TAPE INPUT
(18) and of the USB jack (50)
14
– the sum signal ALT 3 – 4
– the sum signal MAIN MIX
Detailed information about the monitoring func-
tions can be found in chapter 5.6.
Connect the headphones (impedance ≥ 8 Ω) to
the 6.3 mm jack PHONES (23). Connect the
button
amplifier of the monitor system to the output
CONTROL ROOM OUT (53); the 6.3 mm jacks
for the left (L) channel and the right (R) channel
are unbalanced.

4.6 Monitor system for musicians

When using a monitor system for PA stage appli-
cation, the Aux send way 1 can be used as a
monitor way. The signal pick-up for an Aux send
way used as a monitor way is usually pre-fader,
i. e. the channel signal is added to the Aux send
way ahead of the fader (15). Thus, the musicians
receive a separately mixed music signal via the
stage monitors. The Aux send way 1 can be
switched "pre-fader" for each input channel by
pressing the buttons PRE (8).
Connect the amplifier of the monitor system
or an active monitor system via a 6.3 mm plug to
the mono output jack AUX SEND 1 (17).
4.7 Amplifier for PA application

for the audience / second mixer

The stereo sum signal MAIN MIX is available at
two outputs MAIN OUTPUTS (51): at the XLR
jacks and at the 6.3 mm jacks (L = left channel,
R = right channel). All jacks MAIN OUTPUTS are
balanced. It is possible to connect the amplifier
for PA application for the audience to one of the
outputs. The second output can be used addi-
tionally, e. g. for a second amplifier or another
unit with line input.
At the output ALT 3 – 4 OUTPUTS (52) the
stereo sum signal of the channels of which the
buttons MUTE ALT 3 – 4 (11) are engaged are
available: ALT 3 for the left channel, ALT 4 for
manual of the
the right channel. The 6.3 mm jacks are unbal-
anced. The master channels ALT 3 – 4 can be
used as an alternative or in addition to the main
master channels MAIN MIX. They offer e. g. the
possibility to pass on the stereo sum signal of a
group of audio sources (e. g. the microphones
for the drums) to a second mixer or to feed it as
a subgroup signal via a free line input to the
MAIN MIX sum.
4.8 Momentary action foot pedal
and console light
To switch the internal effect processor on and
off, a momentary action foot pedal, e. g. FS-60
from MONACOR, can be connected to the
6.3 mm jack FX FOOTSW (22).
For console illumination a gooseneck light
(12 V /400 mA max.) may be connected to the
BNC jack LAMP (24), e. g. the LED light GNL-
204 from "img Stage Line". The light is switched
on and off together with the mixer.

4.9 Power supply

Connect the supplied mains cable to the mains
jack (46) and the mains plug to a socket
(230 V~/50 Hz).

5 Operation

CAUTION Never adjust the audio system
and the headphones to a very high
volume. Permanent high volumes
may damage your hearing! The
human ear will get accustomed to
high volumes which do not seem
to be that high any more after
some time. Therefore, do not fur-
ther increase a high volume after
getting used to it.

5.1 Switching on and off

1) To prevent switching noise and a volume
which is too high, set the following output
controls to minimum prior to operation:
– MAIN MIX (45)
– ALT 3 – 4 (31)
– PHONES / CTRL R (39)
– AUX SEND 1 (25) when the Aux send way 1
is used as a monitor way.
2) Depending on the microphone type con-
nected, either switch on or off the 48 V phan-
tom power with the switch PHANTOM
POWER (49) [ chapter 4.1].
3) To switch the mixer on and off, actuate the
mains switch POWER (48). With the unit
switched on, the POWER LED (41) lights up.

5.2 Level control of the input channels

The following steps merely serve as an aid, also
other ways of proceeding are possible.
As a basic setting, prior to level adjustment of the
input channels, first
– in all mono input channels, turn the controls
TRIM (4), the equalizer controls (6) and the
controls PAN (10) to mid-position and disen-
gage the buttons LOW CUT (3).
– in all stereo input channels disengage the but-
tons LEVEL (5), turn the equalizer controls (6)
and the controls BAL (10) to mid-position.
– in all input channels fully turn back the controls
AUX (7) and FX (9) for the Aux send ways.
– fully turn back the controls AUX RETURN 1
(35) and AUX RETURN 2 (37) and disengage
the button 2-TR / USB TO MAIN (40).
– disengage all buttons MUTE ALT 3 – 4 (11).
– disengage all SOLO buttons (14, 26) and set
all channel faders (15) to minimum.
1) Feed an audio signal (test signal or music
piece) to the first channel used.
2) To hear the signal via the connected PA sys-
tem, advance the fader (15) of the channel up
to position "0" and advance the MAIN MIX
master faders (45) so that the signal can be
heard well. However, the signal can also be
monitored with the faders closed via head-
phones or a control room monitor system
chapter 5.6.
3) Press the button SOLO (14) of the channel.
Thus, the monitoring function for the channel
is switched on, the LED CLIP (13) lights up as
an indication.
4) Press the button MODE (44) to select the
monitoring mode "PFL", the green LED PFL
above the button lights up. In the "PFL" mode
the channel signal is displayed in mono
ahead of the fader (15) and the control PAN
or BAL (10) via the level indication (43).
5) By means of the level indication (43) adjust
the input amplification in an optimum way: