Lab.gruppen PLM 20K44 Operation Manual page 64

8. Back Panel Interface
8.2.3. 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 8.10.
HOT
COLD
SCRN
Unbalanced Output
(Typically phono)
Figure 8.10: Balanced to Unbalanced Analog Wiring and Pin Out
The method shown in Figure 8.10 uses twin-and-screen (balanced) cable and standard XLR pin connections at the
PLM+ Series device 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 8.15 may be used.
HOT
SCRN
Unbalanced Output
(Typically phono)
Figure 8.11: Unbalanced Analog Wiring and Pin Out
8.2.4. Iso-Float Electronic Balancing
The analog input electronic balancing circuits use the Lake Iso-Float system.
The Iso-Float technology combines the benefits of transformer-coupled isolation with the advantages of clean,
direct-coupled inputs. The audio converters are galvanically isolated, and not connected to the main ground. High-
quality transformers and opto-isolators create a barrier between the device and possible grounding aberrations
from the outside electrical environment.
Iso-Float settings are adjustable via the front panel menu or the Lake Controller software.
64
PLM+ SERIES Operation Manual rev 3.0.1
2 1
HOT
COLD
3
SCRN
Balanced Input
(XLR)
2 1
HOT
SCRN
3
Balanced Input
(XLR)