Back Panel Interface
39
LM 26 Operation Manual rev 1.1.8
7.1.3
Analog XLR Wiring and Pin Out
All XLR connections are wired to IEC268 as shown in Figure 7-4.
Figure 7-4: IEC268 XLR Wiring and Pin Out
Pin 1: Ground / Shield
Pin 2: Hot (+)
Pin 3: Cold (-)
7.1.4
Unbalanced Operation
Balanced connections are recommended where possible. However, if it is necessary to drive the device
from equipment with an unbalanced output, wire the inputs as shown in Figure 7-5.
1
2
3
COLD
HOT
SCRN
COLD
HOT
SCRN
Unbalanced Output
(Typically phono)
Balanced Input
(XLR)
Figure 7-5: Balanced to Unbalanced Analog Wiring and Pin Out
The method shown in Figure 7-5 uses twin-and-screen (balanced) cable and standard XLR pin connections
at the LM 26 end, with the cold wire and the cable screen connected to the signal ground of the equipment
at the source end.
This usually provides better noise and hum rejection than the more common method of joining pins 1 and
3 together in the XLR. However, if only a single-core (unbalanced) cable is available, the method shown in
Figure 7-6 may be used.