QSC DCM series, User Manual

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It is recommended that you purchase a standard 25 pin cable from any of the well known cinema
industry cable suppliers.
6. Impaired Hearing Connection
The Hearing Impaired output signal is available on the screw terminal connector on the rear of the
DCM. This signal is unbalanced (the “+” label is the “hot”, and the “-” label is a ground refer-
ence). The output signal is similar to levels that are output from a standard CD player.
7. Powered Subwoofer Connection
Screw terminal connections make it possible to send a balanced signal to a powered subwoofer.
This signal is balanced and the circuitry is designed for long cable runs from the projection booth
to the theater screen. The high-pass filtering and level adjustments are done by the DCM unit.
NOTE: There will be no fault analysis or output audio monitoring available for the sub channel
signal if this connection is used.
8. Surround Insert Connection
Connect a cable between this connector and an external processor box such as the Dolby SA-10.
Signals will be routed out of the DCM to the processor box and back into the DCM for output to
the amplifiers (via the proper DataPorts). The pinout of the cable is shown in Appendix 1.
B. System Calibration (typical)
When installing a typical cinema sound system, most of the calibration involves the cinema processor.
Refer to the user manual for the brand and model cinema processor that you are using.
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WARNING: Turn the volume knob on all of the QSC amplifiers all the way down until crossover set-
tings and levels are verified!
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Concerning the DCM portion of the installation, you need to start by connecting the cinema processor
and amplifier cables. Connect a PC computer to the RS232 connector, turn on the DCM unit, load the
DCM Commander PC software and either load a full configuration file (if this theater uses the exact
same settings as another theater), or select and enter all of the data in the Configuration section of the
DCM Commander software.
The General Configuration and Amp & Speaker Configuration parameters must all be set correct-
ly for the system to function properly.
If all system and crossover settings look correct in the DCM Commander software, you are ready to
start calibration.
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