Sonifex Redbox RB-DA6 User manual

22 Redbox User Handbook No 2
7 RB-DA6 & RB-DA6G 6 Way Stereo Distribution Amplifier
Introduction
Fig 7-1: RB-DA6 Front Panel.
Fig 7-2: RB-DA6G Front Panel.
The RB-DA6 and RB-DA6G are high performance 6 way stereo analogue distribution
amplifiers for splitting a source to a number of different outputs. The RB-DA6 has 1 stereo
input and 6 stereo outputs with gain control on both inputs. It can also be configured so
that 1 mono input can be distributed to 12 outputs. As a variant of the RB-DA6, the RB-
DA6G, has an individual gain control on every output.
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.
The outputs can be wired unbalanced.
The RB-DA6 has master left and right gain controls which are pre- set potentiometers
accessible through the front panel. On the RB-DA6G each channel has an individual output
gain control (normalising) which are all pre-set potentiometers, also accessible through
the front panel. The 1-12 mono, 1-6 stereo switch is recessed on the front panel to prevent
accidental knocking. An LED power indicator on the front panel displays the power supply
connection.
AUDIO DISTRIBUTION AMPLIFIERS - RB-DA6 & RB-DA6G
AUDIO DISTRIBUTION
AMPLIFIERS
7

Redbox User Handbook No 2 23
System Block Diagrams
AUDIO DISTRIBUTION AMPLIFIERS - RB-DA6 & RB-DA6G
Fig 7-3: RB-DA6 Block Diagram.
Fig 7-4: RB-DA6G Block Diagram.
AUDIO DISTRIBUTION
AMPLIFIERS 7
Left Outputs
Balanced
Left Input
Balanced
Stereo/Mono
Right
Input
Balanced
Right Outputs
Balanced (Mono 7-12)
Gain
Gain
1 2 3 4 5 6 1 2 3 4 5 6
Left Outputs
Balanced
Left Input
Balanced
Stereo/Mono
Right
Input
Balanced
Right Outputs
Balanced (Mono 7-12)
1 2 3 4 5 6 1 2 3 4 5 6

24 Redbox User Handbook No 2
Fig 7-5: RB-DA6 & RB-DA6G Rear Panel.
Inputs (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or unbalanced by using
the front panel gain controls, and by connecting the non-phase to the signal ground. The
input can be configured as either a stereo input with six stereo outputs or a mono input
with twelve outputs. The XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Stereo Outputs 1-6 (Mono Outputs 1-12)
The XLR 3 pin outputs are electronically balanced, and can be wired unbalanced. Each
output is individually buffered so that a short circuit on one output will not affect the others.
They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Input Gain Control (RB-DA6)
The input gain on the RB-DA6 can be varied –8dB to 18db by adjusting the pre-set
potentiometers. These are accessible through the holes in the front panel. The RB-DA6 has
separate left and right master gain controls.
Connections and Operation
Stereo/
Mono
Switch
Input
Gain
Controls
AUDIO DISTRIBUTION AMPLIFIERS - RB-DA6 & RB-DA6G
AUDIO DISTRIBUTION
AMPLIFIERS
7
Fig 7-6: RB-DA6 Front Panel.
Output Gain Control (RB-DA6G)
The output gain on the RB-DA6G can be varied –8dB to 18dB by adjusting the pre-set
potentiometers. These are accessible through the holes in the front panel. The RB-DA6G has
output gain controls on every output.

Redbox User Handbook No 2 25
Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed channel to 6 stereo
channels, and a mono channel to 12 mono channels, by the push button on the front panel,
which is recessed to prevent accidental switching.
Technical Specifications
Audio Specifications
Input Impedance >20kΩ bridging
Output Impedance <50Ω
Maximum Input Level +28dBu
Maximum Output Level +28dBu
Frequency Response 20Hz to 20kHz ± 0.1dB (600Ω load, ref 1kHz)
Gain Range Adjustable 8dB loss to 18dB gain
Common Mode Rejection >66dB typically
Distortion 0.01% THD @ 1kHz, ref +8dBu output
Noise -100dB unity gain ref +8dB (RB-DA6)
-88dB unity gain ref +8dB (RB-DA6G)
Connections
Inputs 2 x XLR 3 pin female (Balanced, can be unbalanced)
Outputs 12 x XLR 3 pin male (Balanced, can be unbalanced)
Mains Input Filtered IEC, 110V-120V, or 220-240V, fused, 6W maximum
Equipment Type
RB-DA6: 6 way stereo distribution amplifier
RB-DA6G: 6 way stereo distribution amplifier with output gain
Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
Dimensions (Boxed): 53cm (W) x 20.5cm (D) x 6cm (H)
Weight: Nett: 1.3kg Gross: 1.9kg
AUDIO DISTRIBUTION AMPLIFIERS - RB-DA6 & RB-DA6G
AUDIO DISTRIBUTION
AMPLIFIERS 7
Output Gain Controls
Stereo/
Mono
Switch
Fig 7-7: RB-DA6G Front Panel.