3
Applications
This mixer with three input channels (1 × mono, 2 ×
stereo) is ideally suited for sound mixing used for PA
applications or recording applications. It allows to con-
nect a maximum of four audio sources with line output
level (e. g. musical instruments, CD players), a micro-
phone, an audio recorder and headphones.
Model MMX-512USB is additionally equipped with
a USB audio interface (USB 1.1 compatible) for con-
necting a computer. The USB port operates in full
duplex mode, i. e. it can be simultaneously used as an
output (for digital output of the master signal to the
computer) and as an input (for transmitting audio data
from the computer to the mixer). For operating the
mixer with the computer, either use the audio software
supplied with the operating system or an audio soft-
ware installed additionally. Various programmes for
audio reproduction/recording are available on the
Internet, free of charge.
4
Setting the Mixer into Operation
Prior to connecting any units or to changing any exist-
ing connections, always set the master control MAIN
MIX (24) for the overall volume to the left stop.
4.1
Connecting the audio sources
The mixer allows to connect a microphone and several
audio sources with line output level (e. g. musical
instruments, CD players).
4.1.1 Input channels 1, 2 /3 and 4/5
All inputs of the three channels are balanced.
1) For mono channel 1, either connect a microphone
to the XLR jack MIC (1) or a mono line unit to the
6.3 mm jack LINE 1 (2). As it will not be possible to
switch between the microphone input and the line
input, never use both inputs at the same time.
2) For the stereo channels 2/3 and 4/5, respectively
connect a stereo line unit to the 6.3 mm jacks LINE
2/3 (3) or LINE 4/5 (4): L (MONO) = left channel,
R = right channel. When connecting a mono unit,
only use the jack L (MONO). The input signal will
then be switched internally to the right and left
channels.
Note:
For model MMX-512USB, the input signal of the
jacks LINE 4/5 and the input signal of the USB jack use
the same channel. As it will not be possible to switch
between the line input and the USB input, never use both
inputs at the same time; otherwise channel 4/5 will
receive the mixed signal of both inputs.
4.1.2 Input TAPE IN
An additional unit with line output level (e. g. a recorder
for reproduction) can be connected to the phono jacks
TAPE IN (17): L = left channel, R = right channel.
4.2
Connecting an amplifier, a recorder and
headphones
An amplifier can be connected to the 6.3 mm jacks
MAIN OUT (5) and a recorder to the phono jacks REC
OUT (18): L = left channel, R = right channel. The
6.3 mm jack PHONES (6) allows to connect stereo
headphones with a minimum impedance of 32 Ω.
At all outputs, the master signal adjusted with the
control MAIN MIX (24) is available.
Note:
If the mixer is connected both to a computer (model
MMX-512USB only
→
chapter 4.4) and to units grounded via
the mains cable (e. g. amplifiers), hum noise may occur due
to ground loops. To eliminate this noise, connect the mixer to
the corresponding unit via a ground isolator (e. g. FGA-102
from the product range of “img Stage Line”).
4.3
Connecting the power supply
Connect the plug-in power supply unit provided to the
jack AC POWER IN (26). To secure the connection,
fasten the nut on the plug. Then connect the power
supply unit to a mains socket (230 V~/50 Hz).
4.4
Operation with a computer
(for MMX-512USB only)
Via the USB port (27), digital audio signals can be
transmitted in both directions between the mixer and
the computer, even at the same time.
When used as an input:
Audio signals fed in via the USB port will be sent to
channel 4/5.
When used as an output:
The USB port will provide the master signal adjusted
with the control MAIN MIX (24).
The USB port can only be used in connection with a
computer. Direct connection of reproducers or storage
media with USB port to the mixer will not be possible.
1) Start the computer and switch on the mixer via the
POWER switch (25).
2) Prior to making the USB connection, set the control
LEVEL (16) for channel 4/5 to the left stop.
3) Connect the USB port of the mixer via a USB cable
(e. g. via the cable USB-203AB available as an
accessory) to a USB port on the computer: The
USB interface of the mixer will be recognized as an
external USB unit, e. g. as “USB Audio”, “USB Audio
Device” or “USB Audio CODEC”, depending on the
operating system of the computer. The drivers
required (standard drivers of the operating system)
will be installed automatically.
Note:
In some cases, it may be necessary to make a
manual path assignment of the drivers if they are not
found automatically by the operating system. If neces-
sary, install the required drivers via the original CD of the
operating system or via the Internet if they are not avail-
able on the computer.
9
GB
