Sonifex RB-PMX4 User Handbook

10 input, 4 output analogue preset mixer

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M IX ER & SO URCE S EL EC TORS

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.

Redbox User Handbook No 3

Table of Contents

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Page 1 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.
Page 2 Balanced XLR Input 9 Gain Balanced XLR Balanced XLR Output 3 Output 4 Balanced XLR Input 10 Gain Fig 3-2: RB-PMX4 Block Diagram. Rear Panel Connections and Operation Inputs Outputs Fig 3-3: RB-PMX4 Rear Panel. Redbox User Handbook No 3...
Page 3 INPUT LEVEL Switch Banks Input Gain Controls Fig 3-4: RB-PMX4 Front Panel Controls. Switch Banks There are 4 oﬀ 10-way switch banks, one for each output. Using these switches, each input channel can be individually selected to each output. When the switches are up (OFF) position, they are oﬀ...
Page 4 MI XE R & S O URCE SEL EC TO RS Technical Speciﬁcations RB-PMX4 Audio Speciﬁcations Maximum Input Level: +28dBu Input Impedance: >20kΩ balanced bridging Maximum Output Level: +28dBu Output Impedance: <50Ω Frequency Response: 20Hz to 20kHz ±0.1dBu (600 Ω load, @ 1kHz) Input Gain Range: Adjustable 8dBu loss to 18dBu gain.