8
Operating Manual -MX-406 Stereo Microphone/Line Mixer
ground, pin 2 is (+), and pin 3 is (-). This signal is determined by the mono output level control, with a nominal
operating level of +4dBu.
Note: The mono transformer-balanced output is designed to drive up to +24dBu into 600 ohm loads. Because
of the nature of an output transformer, the output level increases as the impedance of the terminating load becomes
higher than 600 ohms. Whereas a "direct-coupled" output stage like that of the right and left outputs will not change
as the load changes, any transformer used in an audio path is affected by its termination impedance. Since line level
inputs on audio devices are typically 10K
Ω
or higher, expect a slight increase (2.5dB) in output level when driving
conventional active 10K
Ω
inputs with the transformer outputs.
6.9 Stereo Outputs
The 1/4" jack stereo right and left outputs are controlled by the left and right master. They are pseudo-
balanced TRS jacks with a nominal operating level of +4dBu into any load, and are capable of driving long lines.
6.10 +48V Phantom Power Switch
This switch a48VDC to all six XLR mic inputs to power condenser microphones. Phantom power will
not affect most dynamic mics, which may be used along with condenser mics.
7. TYPICAL APPLICATIONS:
7.1 Small Sound Reinforcement System:
In the setup shown here, the MX-406
is used to mix typical sound sources
that might be found in a church, small
club, school theater or similar environ-
ment. Four of the input channels are
used for vocal microphones, while the
remaining two channels are used for
stereo accompaniment tracks. The ste-
reo line input is used for additional
pre-recorded music such as that of a
movie soundtrack or CD player. Ste-
reo line output RCA jacks are used to
record the event to a cassette, video
camera, or even a PC with recording
capabilities.
Stage monitors are fed using the aux
mix to the master aux output, and left
and right outputs drive the main speak-
ers. The mono output drives a 70 Volt
distributed sound system amplifier,
used for plenum (ceiling) speaker in-
stallations.
MX-406
Microphone
Mixer
Four Vocal
Mic Inputs
EQ,
Limiter,
Crossover,
Amplifier,
etc.
(-)
(+)
2
3
1
Stereo
Outputs
Right
Mono
Output
(Transformer
Balanced)
Model MX-406
Made In USA
100-120VAC
50-60Hz 15W
CAUTION
RI S K O F E LE C T RI C SH O C K
DO N O T O PE N
+48V
Phantom
Power
Left
Aux
Master
Output
Stereo
Line
Input
Stereo
Line Out
-L-
-R-
-20dB Pad
(Mic Only)
Ch.6 Insert
Tip=Out Ring=In
Ch.6
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.5 Insert
Tip=Out Ring=In
Ch.5
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.4 Insert
Tip=Out Ring=In
Ch.4
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.3 Insert
Tip=Out Ring=In
Ch.3
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.2 Insert
Tip=Out Ring=In
Ch.2
Mic/Line Input
-20dB Pad
(Mic Only)
Ch.1 Insert
Tip=Out Ring=In
Ch.1
Mic/Line Input
PU
S
H
PUS
H
PUS
H
PUS
H
PUS
H
PUS
H
Main
Right
(L)
MX-406 Small Sound Reinforecement System
Accompaniment Tracks
Cassette Player
(R)
(Aux)
Monitor
Amplifier
Monitor
Main
Left
VCR, CD, DVD Player
Audio Output
Recording
Device
(Stereo
Line Out)
70 Volt Distributed
Sound System Amp
(Stereo
Line Input)
(Mono
Output)
(Stereo
Outputs)
