Operation Manual
5. Operation and performance
18
C SERIES Operation Manual rev 2.0.0
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
NOTE: 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 amplier channels before external line-drivers might be required to buffer
the signal.
5.4.2. Output operation and connection
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 amplier 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.
The main benet of bridging the output is a doubling of output voltage. Bridging can be used to turn the amplier
into a 3-channel amplier with, for example, 2 x 250 W and 1 x 500 W at 4 ohms utilizing the C 10:4X, or simply to
achieve an impressive 200 V peak supply per channel.
Figure 5.4.2: Screw terminal speaker output eld