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3
MIXER & SOURCE SELEC TORS
3
RB-PMX4 10 Input, 4 Output Analogue Preset Mixer
Introduction
Fig 3-1: RB-PMX4 Front Panel .
The RB-PMX4 is a high performance 10 mono input to 4 mono output preset mixer. Each of
the four outputs has a 10 way DIP switch associated with it to select which of the 10 inputs
are routed to it. So, by altering the DIP switches, any of the input sources can be mixed to
any of the outputs. The DIP switches are enclosed by a screw-on cover on the front panel so
that the settings can not be accidentally changed for secure applications.
The RB-PMX4 has been designed for situations where a small mixer is needed for
installations where it will be configured and then only altered occasionally, or never altered.
Uses for this product are numerous including a four bus mini-mixer, a 4 zone mixer for pubs
and clubs, a multiple clean-feed generator and a quad stereo to mono converter to name
a few.
The XLR-3 inputs and outputs are electronically balanced and can be wired unbalanced.
Each output is individually buffered so that a short circuit on one won't affect the others.
Each input has its own gain control which is a pre-set potentiometer accessible through the
front panel. This provides gain adjustment of -8dB to 18db. This is useful for normalizing
consumer and professional signals to give outputs of -15dBu and 0dBu respectively.
The front panel is held on by 2 off M3 x 6 stainless steel dome-head screws and can be
removed using a 2mm AF hex key (allen key). Each 10-way switch represents an output and
the individual switches represent the inputs that will be mixed to that output. Switches are
in the ON (down) position to be mixed and the OFF (up) position for off.
The XLR-3 outputs are electronically balanced and can be wired unbalanced. Each output is
individually buffered so that a short circuit on one won't affect the others.
An LED power indicator on the front panel displays the power supply connection.
21
Redbox User Handbook No 3
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