I N S T A L L A T I O N a nd P OWER
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D-75 / Sep 2004
Note that the power supply is fitted with a 3-wire grounded AC cord
that should be plugged into a "clean" AC power source, that is, an AC
source that feeds only the control room audio gear. This source should be
a separate feed from those powering lighting, air-conditioning, or any
other non-audio machinery. The third pin ground wire of the AC source
should be tied to the central system ground point.
Energizing
Assuming the D-75 console mainframe is properly placed and grounded,
and its SPS-100 power supply correctly rackmounted and connected to the
console, you may now energize the power supply by plugging it into the
AC mains.
Note: To de-energize the console, unplug the rackmount power supply’s
AC cord from the AC mains. Never de-energize the console by discon-
necting the cable that connects the console and power supply together.
Once you have verified proper power-up, unplug the rackmount power
supply to de-energize the console. You may now proceed to wire up audio
and control connections.
Audio and Control Wiring
All audio and control I/O connections to the D-75 console are made
through multipin DB-25 connectors located on the top of each module.
The factory supplied hand crimping tool is used for all I/O wiring
connections to and from the console (see instruction on the page 1-8).
Connection Procedures
As supplied from the factory, the console requires no logic connections
to function. Therefore an orderly installation begins with the audio wiring.
Note this manual is organized by module type (inputs, outputs, monitor
modules, etc.); each chapter contains detailed wiring instructions for its
module type. Proceed through the manual, chapter by chapter, until all
modules have been wired to suit your particular installation requirements.
Once proper audio operation is verified, go back to each individual chapter
and proceed with control wiring.
Digital Audio Connections
CABLE - All AES/EBU input and output digital audio connections are
balanced and should be made using a high quality digital audio cable. Be
sure to select a digital audio cable with an integral drain wire of the same
wire gauge (AWG) as the twisted pair. Typical AES/EBU digital audio
cable has a very low characteristic capacitance per ft (pF/ft), and a nominal
impedance of 110Ω. High quality digital audio cable offers better signal
transmission performance versus typical analog audio cable, especially
over long cable runs. Check the cable manufactures data sheet to be sure
the cable you plan to use will work in your application.
D-75 / Apr 2008
The power feed recom-
mended in the text is of-
ten installed and referred
to in studios as an “iso-
lated AC ground” outlet.
It is usually orange in
color.
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