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no standards for this kind of equipment, which means, that you have to
figure out what works. In addition, there may be temperature problems in
a rack, when several units with high operation temperature are mounted
above each other. It is always a good idea to make some tests before you
make the rack layout and the cables.
Here are some proven rules:
Use only balanced cables
Even if a particular device is unbalanced, use a balanced cable. This
gives the opportunity to transport the ground potential of the particular,
unbalanced device to the balanced input of the console or another device.
This means, that the balanced input 'sees' the voltage differential between
the unbalanced output and the ground of the device and not the output
to the ground of the console. Any difference in the ground potential of
the console and the external device will not cause problems using these
principles. Otherwise, the voltage difference between the two grounds
becomes a part of the audio signal.
The rules in brief
Connect all cable screens to the console and leave the other end open
If an external device is balanced, connect both lines to hot and cold.
If the external device is unbalanced, connect the hot / + phase to the
unbalanced input or output and the cold/- phase to the ground of the
external device.
Connect the screen to that end of the cable that is attached to the console
only.
While you actually don't know what ground potential a particular screen
pin of a connector of an external device has, you know that all screen
pins of the console have a clean ground potential that can be used for
screening without problems. If the cable is not attached to the console but
to a patch bay or distribution panel, prepare a similar system for the cable
screens in that patch-bay.
Carrying out the installation
Most of the work is cable assembly, which has to be made carefully. Care
must be taken not only about the soldering and the isolation but also of an
appropriate pull relief and the mechanical stability of the cables and the
connectors. Every cable should be carefully tested before it is installed.
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