Operation Manual

8. Back Panel Interface
PLM+ SERIES Operation Manual rev 3.0.4
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Connect the ‘+’ loudspeaker terminals to the red binding posts and the ‘ – ‘ terminals to the black binding posts.
There are three methods of connecting speaker cables to the binding posts.
1. Solder 4 mm banana-plugs to the ends of the speaker wires and plug into the center of the turrets.
2. Thread the stripped ends of the wires through the holes in the posts. Enter the wires for output channels 1 and
3 from above and for channels 2 and 4 from below. Tighten the plastic turrets by nger only, being careful not to
overtighten.
3. Crimp 4 mm insulated spade terminals onto the ends of the wires and push into the binding post assembly
from above (Ch. 1 & 3) or below (Ch. 2 & 4). The hole in the post is ignored. Hand tighten plastic turrets, being
careful not to overtighten.
8.2. Analog Inputs
8.2.1. Analog Input XLR Connections
Four electronically balanced analog inputs are provided via latching XLR3F connectors.
INPUT 1 INPUT 2 INPUT 3
PIN 1: SCRN 2: POS 3: NEG
ANALOG WITH ISO-FLOAT
TM
INPUT 4
Figure 8.8: Analog Input XLR Connections
8.2.2. Analog & AES3 XLR Wiring and Pin Out
All XLR connections are wired to IEC268 as shown in Figure 8.9.
Figure 8.9: IEC268 XLR Wiring and Pin Out
Pin 1: Ground / Shield
Pin 2: Hot (+)
Pin 3: Cold (-)
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PLM+ SERIES Operation Manual rev 3.0.4
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.
12
3
COLD
HOT
SCRN
COLD
HOT
SCRN
Unbalanced Output
(Typically phono)
Balanced Input
(XLR)
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.
12
3
HOT
SCRN
HOT
SCRN
Unbalanced Output
(Typically phono)
Balanced Input
(XLR)
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 benets 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.
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PLM+ SERIES Operation Manual rev 3.0.4