Lab.gruppen C Series 5:4X - Manual (Page 23)

C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4
Operation and Performance
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If an unbalanced connection is desired this can be achieved by summing the minus (“COLD”) and Ground
terminals and using the + terminal as the “HOT” signal. For the best possible performance, the summing of
ground and minus wires should be done at the source unit end of the cable (e.g. a CD player).
Four or eight connectors as appropriate are supplied for attaching cables to the inputs. The type of connector
used is Phoenix Contacts, Part number MSTB 2,5/3-STZ-5,08
When linking the same source signal to several input
channels, be aware that there is a limit to the number
of channels an output source can “drive”. A typical
output source (e.g. a DSP crossover unit) can drive
up to four amplifier channels before line-drivers would be
required to boost the signal.
5.4.2 Output operation and connection
Figure 6.4.2: Screw terminal speaker output field
Screw-terminal connectors with + and – poles are provided at each channel output for connection of the
speakers.
Make sure that the speaker cables are connected correctly and tightly, and that accurate polarity is maintained
to all speakers in the system.
As the amplifier outputs produce high voltage, do not connect or disconnect speaker cables when the
mains power is on. Also, attach the safety cover on the speaker terminals for safe operation and to
comply with electrical product approvals.
5.4.3 Output bridge mode
It is possible to bridge channels in adjacent pairs of two (A+B and C+D for example). When bridged, the input
source must be connected to input A (A+B) or C (C+D) respectively. Output speaker cables must be connected
to the plus pole on channel A.