All operating elements and connections de -
scribed can be found on the fold-out page 3.
1 Operating Elements
and Connections
The figures on page 3 show model MMX-24USB.
Model MMX-44, equipped with two additional
mono input channels, features the same operat-
ing elements and connections except for the
USB interface and the corresponding additional
functions for USB operation.
1.1 Front panel
Figure shows the example of a mono channel
and a stereo channel; the other input channels
are identical.
1 Input MIC to connect a microphone
(XLR jack, bal.)
Note: A phantom power can be activated for all
microphone inputs
item 22.
2 Input LINE to connect a unit with line signal
level (e. g. musical instrument)
Mono channel:
1 × 6.3 mm jack, bal.
Stereo channel:
1 × 6.3 mm jack, Left L, bal.
1 × 6.3 mm jack, Right R, bal.
To connect a mono unit, only use the jack L.
3 Control GAIN for input amplification
4 Equalizer for HIGH, MID and LOW
5 Button for the low cut filter (high pass fil-
ter); when the button is pressed, unwanted
signal parts below 75 Hz (e. g. impact noise)
will be suppressed
6 Button +4/
-
10 for matching the level of units
with low line output level; when the button is
pressed, the input level will be boosted
7 Control AUX SEND to add the channel signal
to the effect send way; the signal will be
picked up after the control LEVEL (10)
8 Overload LED PEAK; if its lights perma-
nently, turn back the GAIN control (3) and/or
the equalizer controls (4) accordingly (mono
channel) or release the button +4/
-
10 (6)
(stereo channel)
9 Mono channel:
Panorama control PAN to place the mono
signal in the stereo sound
Stereo channel:
Balance control BAL for the stereo signal
10 Control LEVEL to add the channel signal to
the signal sum
11 Output MASTER OUT for the sum signal
(6.3 mm jacks Left L / Right R, unbal.), e. g. to
connect the amplifier for PA applications or a
second mixer
12 Output BOOTH OUT (6.3 mm jacks Left L/
Right R, unbal.) to connect the amplifier of a
monitor system in a separate control room
13 Output AUX SEND (6.3 mm jack, unbal.) of
the effect send way, to connect the input of an
effect unit
14 Output PHONES (6.3 mm jack) to connect
stereo headphones (minimum impedance
8Ω)
15 LED level indicators, to indicate
– the sum signal adjusted with the control
MASTER (16) when none of the buttons
(20, 21) for the monitor function is pressed
or
– the monitor signal selected with the corre-
sponding button (
item 20 or 21)
16 Total level control MASTER for the audio mix
(sum of all signals);
the sum signal is sent via the jacks MASTER
OUT (11), TAPE OUT (18) and the USB port
(28)* and can be monitored via the outputs
BOOTH OUT (12) and PHONES (14)
17 Input TAPE IN (RCA jacks Left L/ Right R) to
connect the output of a recorder or another
reproduction unit, e. g. CD player
18 Output TAPE OUT (RCA jacks Left L/ Right R)
to connect the input of a recorder
19 Button TAPE[/ USB*] TO MIX; with the button
pressed, the input signal of the jacks TAPE
IN (17) and of the USB port (28)* is added to
the sum signal
20 Button TAPE TO BOOTH / PHONES; with the
button pressed, the input signal of the jacks
TAPE IN (17) and of the USB port (28)* is
sent to the monitoring outputs BOOTH OUT
(12) and PHONES (14) and indicated by
means of the LED level indicators (15)
Note: When the button AUX SEND TO BOOTH (21)
is pressed in addition, it will take priority, i. e. the
effect way will be monitored and indicated.
21 Button AUX SEND TO BOOTH; with the but-
ton pressed, the signal of the effect way is
sent to the monitoring outputs BOOTH OUT
(12) and PHONES (14) and indicated by
means of the LED level indicators (15),
ahead of the output control AUX SEND
MASTER (25)
22 Button PHANTOM 48V (with LED); press the
button to apply a 48 V phantom power to all
inputs MIC (1)
Please observe the warning notes with regard
to the phantom power in chapter 4.1.1.
23 Volume control BOOTH / PHONES for the
monitoring outputs BOOTH OUT (12) and
PHONES (14)
24 LED POWER ON
25 Level control AUX SEND MASTER for the
sum signal of the effect send way at the out-
put AUX SEND (13)
1.2 Rear panel
26 Power supply jack to connect the power sup-
ply unit provided
27 On / off switch of the mixer
28 For model MMX-24USB only:
USB port (type B) to connect a computer; can
be used as an output (for digital output of the
sum signal) and as an input (to feed in audio
data)
2 Safety Notes
The units (mixer and power supply unit) corre-
spond to all relevant directives of the EU and are
therefore marked with .
Please observe the following items in any case:
G
The units are suitable for indoor use only. Pro-
tect them against dripping water and splash
water, high air humidity and heat (admissible
ambient temperature range: 0 – 40 °C).
G
Do not place any vessel filled with liquid on the
units, e. g. a drinking glass.
G
The heat generated inside the mixer must be
dissipated by air circulation; never cover the
air vents of the housing.
G
Do not operate the mixer and immediately dis-
connect the power supply unit from the socket
1. if the mixer or the power supply unit is visi-
bly damaged,
2. if a defect might have occurred after a unit
was dropped or suffered a similar accident,
3. if malfunctions occur.
In any case the units must be repaired by
skilled personnel.
G
For cleaning only use a dry, soft cloth; never
use water or chemicals.
G
No guarantee claims for the units and no lia-
bility for any resulting personal damage or
material damage will be accepted if the units
are used for other purposes than originally
intended, if they are not correctly connected
or operated, or if they are not repaired in an
expert way.
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 connect microphones
(also phantom-powered) and audio sources with
line output level (e. g. musical instruments, play-
ers). A send way allows for the 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.
If the units are to be put out of operation
definitively, take them to a local recy -
cling plant for a disposal which is not
harmful to the environment.
WARNING The power supply unit uses dan-
gerous mains voltage. Leave ser -
vicing to skilled personnel. Inex-
pert handling or modification may
re sult in electric shock.
7
GB
* for model MMX-24USB only
