Rb-Sm1 Single & Rb-Sm2 Dual Stereo To Mono Converter; Introduction; System Block Diagram; Fig 9-1: Rb-Sm1 & Rb-Sm2 Front Panel - Sonifex Redbox RB-SS10 User Handbook Manual

9
ST EREO TO M ON O CON VE RT E RS
9 RB-SM1 Single & RB-SM2 Dual Stereo To Mono Converter

Introduction

Fig 9-1: RB-SM1 & RB-SM2 Front Panel.
The RB-SM1 consists of an independent converter that will produce a fully buffered and
balanced mono line output from a stereo input. The RB-SM2 consists of two independent
converters and will produce two fully buffered and balanced mono line outputs from two
stereo inputs.
All connections are on the rear panel. The XLR-3 inputs are electronically balanced with an
impedance of 20kΩ bridging. These can be wired unbalanced to accept an output from
domestic equipment.
The XLR-3 line output's are electronically balanced with an output impedance of <50Ω. The
output's can be wired unbalanced by grounding the non-phase signal, allowing you to feed
both balanced and unbalanced equipment.
Output gain adjustment using a pre-set potentiometer for both converters allows a
normalised mono output from domestic stereo equipment. The potentiometer is accessible
through the rear panel. An LED power indicator on the front panel displays the power
supply connection.
The rest of this manual will refer to the SM1 unless stated otherwise.

System Block Diagram

Left
RB-SM2=X2
Summing
Amplifier
Professional
Balanced
Stereo Input
Professional
Gain
Balanced
Mono Output
Right
Fig 9-2: RB-SM1 & RB-SM2 Block Diagram Single Channel.
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Redbox User Handbook No 3