QSC Audio CM16a manual Installation- Connections, Connecting Audio Inputs

REAR PANEL- AUDIO INPUTS

Section 2: Installation- Connections

CONNECTING AUDIO INPUTS

The audio inputs are located on the rear panel. The CM16a uses “Phoenix”-type (Euro-style) terminal block connectors for

the audio inputs. These connectors allow the installer to pre-wire the input termina- tions 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 for connector manufacturer’s

part number reference. BALANCED INPUT CONNECTION

Balanced connection is recommended for all inputs. 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 that the negative terminal and shield terminal be connected to one another with a jumper wire. The illustrations to the right show the proper connection of audio program input sources for both balanced and unbalanced inputs.

UNBALANCED INPUT CONNECTION

The recommended stripping length for the wires is approximately 6 to 8 mm ( 1/4 to 5/16 inch). When stripping the audio cable, be careful not to nick or cut the conductor strands. After each conductor has been stripped and dressed, insert it fully into the connector and tighten the retaining screw. When stranded wire is used, carefully twist the conductor strands together so that when they are inserted into the connector assembly, no loose strands short adjacent terminals.

STRAIN RELIEF

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-terminal with the strain relief was available through QSC . See Section 6 (Appendix) for connector part numbers.

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