9
English
3 Applications
The MXT-52MP3 is a monophonic audio mixer
for sound reinforcement systems (e . g . PA sys-
tems) . It is designed for wall and furniture in-
stallation . The mixer provides five inputs . Two of
these inputs can be used for the connection of
microphones; they provide a switchable phan-
tom power supply that is required for electret
microphones, for example . Three inputs can be
used for the connection of stereo audio sources
such as CD players, for example . In addition, the
mixer features an integrated audio player for the
replay of audio files from a USB flash drive or SD/
MMC memory card . An infrared remote control
for the audio player is provided .
4 Installation
The mixer is designed for installation into walls
or furniture . The dimensions of the unit can be
found in figure 2 on page 2 . The four holes of
the front plate can be used to fasten the mixer .
Prior to installation, make the connections on
the rear side of the unit .
4.1 Making connections on the rear side
To connect the power supply and the amplifier,
open the housing: Remove the screws
🄰
of
the front plate . Guide the connection cables
through the hole on the rear side and make the
connections . Then close the housing .
OUTPUT
~
/
⎓
24V
17
18
➌
Connections for amplifier and power supply
4.1.1 Amplifier
Connect the input of the amplifier to the termi-
nals of the balanced signal output (17) (fig . 3,
OUTPUT) .
4.1.2 Power supply
Connect a 24 V power supply unit with a per-
manent rating of 250 mV to the terminals (18) .
DC voltage supply or AC voltage supply can
be used . Consequently, the polarity does not
matter when a DC voltage source is used .
4.1.3 Grounding
The terminal screw on the rear side of the unit
can be used as ground connection . This may be
necessary when, for example, the mixer is used
together with an amplifier that is not connected
to ground and hum noise occurs .
4.2 Making connections on the
front side
4.2.1 Mono audio sources, microphones
Monophonic signals of microphones or audio
sources with line level can be fed in via XLR
plugs connected to the jack MIC / LINE 1 or MIC /
LINE 2 (11) .
The jacks are designed for balanced signals .
Audio sources with unbalanced signals can be
connected via an XLR plug where the contacts
1 and 3 are connected with each other .
Use a small screwdriver to turn the GAIN
control (10) towards “+” (for microphones)
or “−” (for audio sources with line level) . If
required, readjust the control during operation .
(When the volume of the sound via this input is
too low, turn the control clockwise; when the
sound is distorted, turn the control anti-clock-
wise .)
Phantom power supply
When an audio source (e . g . electret micro-
phone) requires phantom power supply, engage
the switch PH . PWR (12) of the corresponding
XLR jack: The phantom power (
⎓
19 V) for the
jack will be activated .
Caution:
1 . To avoid loud switching noise, only use the switch
when the mixer or amplifier is switched off .
2 . Never connect an audio source with unbalanced
signal output to the XLR jack when the phantom
power supply has been activated; otherwise, the
audio source may be damaged .
4.2.2 Stereo audio sources
Connect units with a stereo output (e . g . CD
player, tuner) to the RCA jacks LINE 3/4 (13) or
to the 3 .5 mm jack AUX (14) . The mixer is mono-
phonic; therefore, the left and the right stereo
channels will be mixed to a mono signal .