3.3
WIRING CONNECTIONS TO THE SDEC
21
• The first time SDEC is powered, it may take up to 30 seconds to “boot”. After system calibration is complete, boot time
is reduced to about ten seconds. When boot is complete, the red light around the power switch goes off, and an amber
LED in the center of the front panel comes on.
• Select an active program source. At this time, confirm that all channels are working. Now select another “effect” on the
surround processor that triggers a mode change. Confirm that all channels are still operating normally. Remember, as
the system is no longer calibrated, it probably will not sound the way it did when you started. If all channels are working
normally, you are now ready for connection to the Digital Audio Calibration System for complete equalization.
• If the system is not performing as expected, refer to “Troubleshooting” in Section 4.7.
Case II – Installing an SDEC as part of a new Synthesis system installation:
• Install the surround processor, signal sources, power amplifiers, and speakers appropriately. The SDEC can be located
near the surround processor or power amplifiers, but should not be subjected to excess heat; do not put it above an
amplifier in a rack unless excellent ventilation is provided. There are NO user controls on the SDEC; it is not necessary
to locate it within the operators reach. Its settings cannot be changed without the use of the DACS (Digital Audio
Calibration System) equipment.
•
NOTE:
Refer to Section 6 “Interconnection Diagrams” and Section 7 “Control Wiring Diagrams”. Locate the diagram
that illustrates the system you are installing. Use that diagram for the following steps.
• Confirm that all interconnects and control lines are connected as shown in Sections 6 and 7.
• On the rear panel of the SDEC are two slide switches with recessed handles. Unless you are installing a CINEMA-only
system, use a pencil or straightened paper clip to place both switches in the “AUTO” position. If you are installing a
CINEMA-only system, you must put the left switch in the ‘CINEMA MODE” position. This prevents the SDEC from ever
going into “MUSIC MODE” regardless of control signals received from the surround processor.
•
NOTE:
Mode -switching occurs as inputs are selected. Whenever the SDEC is asked to change modes, the system
output is muted for approximately two seconds while the appropriate equalization settings are loaded into the DSP.
This is analogous to loading a program into a computer.
• The right switch determines the mode of AC power control. Normally, the switch should be left in the “AUTO” (left)
position. In “AUTO”, the SDEC will be turned on and off by the surround processor. In the “MANUAL ON” (right)
position, the SDEC is controlled only by the front panel push button.
•
NOTE:
The “AUTO ON” feature only works when the front panel push button is pressed in. If this push button is
released, the SDEC will remain off.
• There are 9-pin and 25-pin “sub-mini D” connectors on the rear panel of the SDEC. The 9-pin, labeled “RS-232” is
only for use during calibration and restoration activities; it is NOT intended for connection to home automation
systems, such as AMX or Crestron. The 25-pin is in parallel with the input jacks, following THX wiring convention.
It is not used with current Synthesis surround processors.
• Connect each amplifier to its loudspeaker. Refer to Section 3.2 “A Note on Wiring” for additional information about
speaker wire selection.
• Connect all system components to a suitable 120-VAC power source. Refer to Section 3.2 “A Note on Wiring” for more
information about AC power connections. The SDEC will be in standby mode as soon as AC power is supplied.
Standby is indicated by red illumination of the escutcheon around the power push button.
Summary of Contents for SYNTHESIS SDEC-1000
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