Appendix 1: Connector Wiring
T
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T E C H N O L O G Y
Page 353
Appendix 1
Appendix 1.
Connector Wiring
XLR 3 Pin Audio Connectors
Connectors viewed from wiring side
XLR Male Output Connectors
.
Never connect pins 2 or 3 to each other,
or to, pin 1, or earth, chassis.
This will result in damage to the audio
output IC of the codec and the warranty
being voided.
Female
Male
Input
Output
Appendix 1.1.
Interconnection of RCA and XLR Connectors
XLR Female Input Connectors:
In some unbalanced installations pins 1 & 3 may need to be joined. There is no
rule set in stone that is guaranteed to work in all circumstances. It is very much a
case by case scenario depending on, amongst other things:
Is the circuit being driven by a transformer? If so is one side of the
transformer is earthed, or a center tap earthed?
Is the driving equipment “semi-professional”, i.e. it is not truly balanced
having one side of the audio tied to O volts (ac ground) and the other
side active?
Is the equipment wired to “rock and roll” standard with pins 2 & 3
reversed, whereupon the preceding goes out the window… and the list
goes on.
The entire implementation of the balanced to unbalanced is the epitome of the
time worn don’t fix it if is not broken rule. In other words, if it works and doesn’t
hum it must be wired satisfactorily.
Pin Balanced
Mic &
Line
Input to the codec from
equipment RCA Connectors
Output from the codec to equipment
with RCA Connectors
1 Ground
See note below
Ground
2 +ve audio audio
Signal
3 -ve audio
ground
Not used.
2
1
3
1
2
3
