Controls & Connectors; Front Panel; Fig 17-3: Rb-Ms4X3 Front Panel Connections - Sonifex Redbox RB-DA6 6 User Handbook Manual

Controls & Connectors

Front Panel

Ext. Phantom Phantom Loopback/
On Indicator Ground Lift Output 2
Ext. 30dB Ground
Phantom Pad Lift Output 3
Enable
On Input

Fig 17-3: RB-MS4X3 Front Panel Connections

External +48VDC
This latching push switch applies the external +48V phantom power (if
connected) to a microphone connected to the rear panel input connector.
ON LED
The ON LED illuminates when both external +48V phantom power is
connected to the rear panel DC socket and the external power is switched
to the input.
30dB Pad
It is possible to attenuate the incoming signal by 30dB for example when
interfacing a line level signal into a microphone preamplifier. The latching
push switch applies and removes the 30dB pad.
Important: Phantom power should be disabled when connecting a line level
signal to the splitter input.
Audio Distribution Amplifier - RB-MS4X3
Output 2 Toggle switch
This switch controls both the grounding of the output 2 XLR connector
(pin 1) and the ability to pass back phantom power (via the internal
transformer's centre tap) from output 2 to a mic connected to the splitter's
input.
Switch Position Phantom Loopback (PL)
Left Disabled
Centre Disabled
Right Enabled
Output 3 Toggle Switch
This switch controls the grounding of the output 3 XLR connector.
Switch Position Phantom Loopback (PL)
Left Grounded
Right Lifted
Phantom Powering Guidance
It is possible to pass phantom power to the splitter input by three different
methods:
• Via the external +48V DC connector.
• From a mic pre-amp connected to direct output (output 1).
• From a mic pre-amp connected to output 2 (provided phantom loopback
is enabled).
It is therefore possible to concurrently power the microphone using any
two of the above methods (for power redundancy) without causing signal
degradation. It is important the output connectors are grounded (and not
lifted) should the external phantom power be connected, to prevent hum/
hiss caused by ground loop currents.
Important: A maximum of two phantom powering methods can be used
concurrently.
17
Output 2 XLR Pin 1
Grounded
Lifted
Grounded
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