GB
8
3
Applications
The 4-channel mixer MPX-300 is suitable for any pri-
vate or professional DJ applications. It allows connec-
tion of up to five units with line level (e. g. CD player), up
to two turntables, and a DJ microphone. The unit offers
pre-fader listening to all audio sources via headphones.
The mixer can either be used as a table-top unit or
be installed into a console.
4
Connection
Switch off the mixer prior to connecting any units or to
changing any existing connections.
1) Connect the stereo audio sources to the corre-
sponding phono input jacks of channels 1 to 4
(white jack LEFT; red jack RIGHT):
- units with line level output (e. g. minidisk record-
er, CD player, cassette recorder) to the jacks
LINE or CD (22);
- turntables with magnetic system to the jacks
PHONO (17). Connect the ground of the turn-
table to the corresponding clamping screw GND
(21) below the jacks.
2) Connect a DJ microphone either to the 6.3 mm jack
DJ MIC (9) on the front panel or to the 6.3 mm jack
DJ MIC (18) on the rear panel.
3) Connect the amplifier to the stereo master output
AMP (19).
4) For audio recordings, connect the recorder to the
stereo output REC (20). The recording level is not
affected by the position of the master control (1).
5) The input channels can be monitored via stereo
headphones (impedance
≥
8
Ω
) ahead of the faders
(12) [PFL = pre-fader listening; see chapter 5.5
“Pre-fader listening to the channels”]. Connect the
headphones to the jack PHONES (10).
6) Finally connect the plug-in power supply unit to the
jack (16) for the power supply (12 V~/1 A) and then
to a mains socket (230 V~/50 Hz).
5
Operation
Prior to switching on, set the master control to “0” to
prevent switching noise. Then switch on the mixer with
the switch POWER (2). The LED above the switch
lights up. Finally switch on the units connected.
After operation, switch off the mixer with the switch
POWER. If the mixer is not used for a longer period,
disconnect the power supply unit from the mains
socket as the power supply unit has a low power con-
sumption even with the mixer switched off.
5.1 Basic adjustment of the input channels
First set all gain controls (6), equalizer controls (8),
and the crossfader (14) to mid-position.
To switch on the DJ microphone, set the selector
switch MIC (13) from the left position “OFF” to mid-
position “ON” (LED above the switch lights up). For the
time being, set the switch PAD (7) to the lower posi-
tion.
Level control of a channel:
1) Use the selector switch (5) to select the input to
which the audio source is connected.
2) With the master control (1), the total level of all
audio sources connected is adjusted. Set the con-
trol to approx.
2
/
3
of its maximum, e. g. to position 7.
3) Feed an audio signal (test signal or music piece) to
the channel. Switch off the units which are to play
on the other channels or set them to pause.
4) Via the LED VU-meter (3), control the level of the
channel with the fader (12). An optimum level con-
trol is obtained if level values in the 0 dB range are
shown at high volume. If the red LEDs of the VU-
meter light up, there is an overload of the channel.
After level adjustment, the fader should be at
approx.
2
/
3
of its maximum. With the fader ad-
vanced only slightly or very far, the level must be
matched by adjusting the input amplification: Turn
up or turn back the gain control (6) of the channel
accordingly (if required, the gain control can also be
fully turned to “MIN” or “MAX”). For the DJ micro-
phone connected to channel 1, an input level which
is too high can additionally be attenuated with the
PAD switch (7) by 10 dB: set the switch to the upper
position.
5) Use the three equalizer controls (8) of the channel to
adjust the desired sound. By adjusting the controls,
the high frequencies (control HIGH), the midrange
frequencies (control MID), and the low frequencies
(control LOW) can be boosted (up to 12 dB max.) or
substantially attenuated (up to 26 dB max.) With the
controls in mid-position, the frequency response is
not affected.
Note: Sound adjustments affect the level. There-
fore, after adjusting the sound, check the
channel level with the VU-meter and readjust
it, if required.
6) Make the level and sound adjustments for the other
input channels connected as described above.
Caution!
Do not adjust the audio system and 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 after some time. Therefore, do not further
increase a high volume after getting used to it.
