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Section 2: Installation- Connections
CONNECTING AUDIO INPUTS
The audio inputs are located on the rear
panel. The CM16a uses terminal block
connectors for the audio inputs. They are
sometimes called “Phoenix” or
“Euro”connectors. These connectors al-
low the installer to pre-wire the input ter-
minations before the CM16a is installed in
the rack. It also allows for re-routing of
audio inputs by simply interchanging connector locations without the need for any
tools. See Appendix (page 38) for connector manufacturer’s part number reference.
For heavy-duty input cables, the use of connectors with integral strain relief
is recommended. These connectors have a large plastic tab molded as part
of the assembly which provides an area to tape or tie-wrap the cable to. At
the time of this writing, only the 3-pin with the strain relief was available
through QSC . See Section 6 (Appendix) for connector part numbers.
BALANCED INPUT CONNECTION
UNBALANCED INPUT CONNECTION
STRAIN RELIEF
REAR PANEL- AUDIO INPUTS
19
Terminal Block Connector Hints-
Strip length : 6 to 8 mm ( 1/4 to 5/16 inch) .
Be careful not to nick or cut the conductor strands .
After each conductor has been stripped, insert it fully into the connector
and tighten the retaining screw. When stranded wire is used, carefully
twist the conductor strands together so when they are inserted into the
connector assembly, no loose strands short adjacent terminals.
Balanced connection is recommended for all inputs.
The illustrations to the right show the proper connection of audio program input
sources for both balanced and unbalanced inputs.Use balanced connections when-
ever possible.
If unbalanced audio sources are used
, it is preferable to use an
appropriate audio transformer (or other unbalanced-to-balanced “converter”) to
provide a balanced input to the CM16a. If this is not possible, then it is recommended
the negative terminal and shield terminal be connected to one another with a jumper
wire.