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6
MIX-4 Installation and Operation Manual
OPERATION
Microphone Phantom Power Switch & LED
This pushbutton switch turns on/off +15 V phantom power to the MIC IN 1 XLR
jack. When the switch is depressed, phantom power is on and the front panel P15 led
is illuminated.
Microphone Gain Adjustment (Mic Gain)
The 15-turn trimmer sets the microphone pre-amplifier gain and allows the use a
variety of microphones with different sensitivity levels. The microphone input is set
to 40 db of gain at the factory but up to 60 db of pre-amp gain is available.
Audio Connections
The MIX-4 interfaces to external equipment through removable euroblock screw ter-
minals and one XLR-F jack for the microphone input. The terminals accommodate
wire sizes from 16 - 28 AWG solid or stranded wire. Before installing a wire, remove
the euroblock screw terminal plug and turn each capture screw fully counterclock-
wise. Strip each conductor to a length of 0.25” and insert the conductor fully into the
terminal. Turn the capture screw clockwise to tighten and secure the conductor.
CAUTION: In no case should either the + or - outputs be connected to ground.
The input impedance is 20KΩ, 600Ω terminations may be installed on the con-
nector if required.
Inputs
Connect your audio sources to any of the four Mix-4 inputs, labelled (1L-/1L+ and
1R-/1R+) thru (4L-/4L+ and 4R-/4R+). For unbalanced input connections, install a
jumper between the “-” input and GND. Single (monaural) inputs should have their
left and right inputs connected in parallel. Observe proper phasing.
MIC IN 1 XLR Connection
When using Input 1 as a microphone input connect a microphone to the female XLR
connector (1) on the rear of Mix-4. Dynamic microphones are recommended. Powered
condenser microphones can be used if they will operate from +15 volt phantom power,
otherwise an external user-supplied phantom power supply may be necessary.
XLR connection pin-out:
PIN 1: Ground
PIN 2: Hi (+)
PIN 3: Lo. (-)
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Input 1
(Top row, TB1)
2L-
2L+
Gnd
2R-
2R+
1L-
1L+
Gnd
1R-
1R+
Input 2
(Bottom row, TB1)
Input 4
(Top row, TB2)
4L-
4L+
Gnd
4R-
4R+
3L-
3L+
Gnd
3R-
3R+
Input 3
(Bottom row, TB2)
Switch Tally/Mix Minus
(Top row, TB3)
Gnd S1NO
Gnd
MM-
MM+
OL- OL+
Gnd
OR-
OR+
Output
(Bottom Row, TB3)
