17
AIROCKS PRO ARX-900 USER GUIDE V1.0
3.2
A
UDIO
I
NPUT AND
O
UTPUT
C
ONFIGURATIONS
As a convenience to the user, the ARX-900 can accommodate several different audio input and output
configurations. Each of the configurations can be selected electronically (no hardware jumpers) and can
accommodate balanced mono and stereo audio input and output signals. This is accomplished internally
by the use of switched audio connections as shown below. These audio configurations are selectable via
the front panel or via the NMS. The NMS gives the user the ability to switch configurations remotely
over the air.
Since the ARX-900 can only operate in one mode at a time (Master or Relay), the Audio Input connector
and Audio Output connector share the same audio path (Audio+ and Audio-) and are therefore
connected in parallel.
3.2.1
Stereo vs Mono
The ARX-900 transmit two independent audio channels over the air. The Master will always transmit XLR
Pin 2 (Tip/Hot) on one channel, and XLR Pin 3 (Ring/Cold) on the other channel. This allows the user to
apply (at the Master XLR) either balanced mono or unbalanced stereo to Pins 2 &3. The remote Relay
can be configured by the user to output either balanced mono audio, unbalanced stereo (Left and
Right), balanced Left channel only, or balanced Right channel only. The table below summarizes these
configurations.
Left & Right
Left
Right
XLR Pin Balanced Mono
Balanced Mono
N/A
N/A
Pin 1
Ground
Ground
Pin 2
Audio +, Tip, Hot
Audio +, Tip, Hot
Pin 3
Audio -, Ring, Cold
Audio -, Ring, Cold
XLR Pin Unbalanced Stereo
Unbalanced Stereo Left & Right
Balanced Left Channel Only
Balanced Right Channel Only
Pin 1
Ground
Ground
Ground
Ground
Pin 2
Left Channel, Tip, Hot
Left Channel, Tip, Hot
Left C, Tip, Hot
Right C, Tip, Hot
Pin 3
Right Channel, Ring, Cold
Right Channel, Ring, Cold
Left Channel -, Ring, Cold
Right Channel -, Ring, Cold
Audio Out at Relay
Source Audio at Master XLR
Relay Output Audio Selector Button
