Rear Panel Description - dbx 786 Owner's Manual

Operating
Rear Panel
Au dio Input and Output Connectors
Each audio input connector on the rear panel of the 786 is a gold-plated Neutrik® XLR female connec-
tor. The no-compromise approach to the 786 required that we use gold-plated connectors, due to their
high conductivity and resistance to corrosion. The connectors are default wired in
2 hot, AES convention), although supplying an unbalanced signal presents no difficulty to the 786, (by
grounding pin 3).
Un balance Switch
The Unbalance switch is associated only with the Output connectors of the 786. When it is in the IN
position, the output of the 786 is switched from balanced to unbalanced. (See Figure 5 on page 9.) In
the OUT position, the 786's outputs are balanced in the "pin 2 hot" configuration. Note that when the
output is unbalanced via the switch, there is a 6dB drop in output signal level, and the meter is still cal-
ibtrated for a balanced signal.
Ground Switch
The Ground switch, when in the IN position, references the center tap of the output transformer to the
chassis ground. The combination of the two switches associated with the audio output connectors
ensures that the 786 is versatile enough to interface with any equipment and can deliver clean audio to
the output, free of hum and interference. (See the Figure 5 for details of the Ground switch operation.)
Chassis Ground Binding Post (
The green Chassis Ground binding post is supplied to give the user another method to provide com-
prehensive grounding options for any installation. It is easy to think of the binding post as being syn-
onymous with the ground pin on any AC power cord. (The ground pin on an AC cord should NEVER
be removed, shorted out, or "lifted".) The post allows the chassis ground to be connected to another
ground source if desired. (ie: a chassis ground system provided by another piece of gear) Wire may be
connected to the binding post by securing the stripped end of the wire through the hole in the post,
located under the hardened plastic nut-top of the post. Access to the hole is gained by unscrewing the
top part of the post far enough to reveal the hole underneath. Insert the stripped end of the wire and
tighten the top (nut) part of the binding post to secure the connection.
Signal Ground Binding Post ( )
The black Signal Ground binding post is located next to the Chassis Ground binding post, and works
in much the same way, providing comprehensive grounding options for any installation. Some systems
are built on a "star" grounding principle, where all the signal grounds are brought directly to one cen-
tral point and grounded to earth at the same location. The Signal Ground binding post allows easy
access to the signal ground system of the 786 without having to remove the cover of the 786 and locate
a good place to take the signal ground out of the box.
8
controls
786
)
MANUFACTURED UNDER THE FOLLOWING U.S. PATENTS:
4,368,425 5,282,252. OTHER PATENTS PENDING.
BALANCED
mode (pin