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A balanced operation is defined as a two conductor shielded cable, where each of the two
center conductors carry the same signal but of opposite phase. The have equal but inverted
potential differences from that of ground.
The advantage of the balanced system is based on the differential amplifier in a subsequent
device suppressing all equal phased noise which has been induced during its transmission
down the cable link. However, the original signal will be amplified and retain all its original
integrity.
In this way, audio signalscanbetransmitted without interference or loss across long distances.
Balanced or unbalanced systems require different wiring. Please read the next section
carefully and pay close attention to the correct wiring requirements of the units in the audio
chain.
The CorrectWiring For BalancedOperation
lf the unit preceding the
WCR 35
uses output balancing, we recommend that you use balanced
audio connections. This will avoid interference such as mains hum etc.
For maximum hum rejection, you should avoid common grounding, which means grounding
the
WCR 35
's inputs and outputs.
We recommend that you connect the shield of the input cable to the ground of the signal source,
making sure that the shield is not connected to the
WCR 35
's input connectors. The shield of
the cables is connected to the ground of the
WCR 35
's outputs, but make sure that the shield of
the corresponding cable ends are not connected to the ground of the subsequent units
Generally speaking, the shield connection will be tied to the source units, but not to destination
units. Please avoid cross linking pin 3 of the XLR connector.
If you still develop hum, it may be helpful in some cases to connect the shields on the inputs of
the subsequent devices also.
OPERATIONWITH XLR CONNECTORS
BalancedOperation
The
WCR 35
uses XLR connectors. We recommend, in accordance with the internationally
agreed IEC 268-12 standard, pin 1: ground (sleeve), pin 2: positive input and pin 3: negative
input. We advise that you adhere to this standard, in order to provide compatibility with
preceding or subsequent units.
The following Figure 5 shows the correct connection for the balanced input wiring, whereas
Figure 6 shows the correct connection for the balanced output wiring for the
WCR 35
. Please
note that you can distinguish between the figures by observing the shield connections.
Unbalanced Operation
Although the
WCR 35
is equipped with electronically balanced inputs and outputs, it can also
function unbalanced. The automatic servo-function recognizes the unbalanced connectors
and compensates for the 6 dB level difference which occurs when used with unbalanced
connections.
If unbalanced operation is required, please connect pin 3 to pin 1 (ground ) of the XLR
connector. As a result pin 2 carries the positive (+/hot ) signal. If pin 3 and pin 1 are not joined,
the negative input will be close space "open" resulting in a drastic deterioration in the signal-to-
noise ratio.
This applies to both the input and output connections. Please note in this application, the cable
Reference Manual
Page 4
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