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conflict with the sound of the Pa system and room
acoustics creating a hot spot that is prone to feedback.
Reversing the polarity can often move the problem out
of the way without having to resort to excessive EQ'ing.
Lifting the ground
The Duplex is equipped with transformers that isolate
the input ground from the output ground and eliminates
hum and buzz caused by so-called 'ground loops'. This
is accomplished by lifting the audio ground between the
Duplex and the mixing console by depressing the LIFT
gRn switch. When set inward, the switch disconnects
pin-1 on the XLR output and allows the transformers to
isolate the signal ground.
rack mounting the Duplex – Part #r800 9422 00
one of the innovations on the new Duplex is the ability
to have it rack mounted by adding the optional rack-
mount kit. This kit enables one or two Duplex units to be
rack mounted in a single 19" (1RU) rack space.
Optional kit lets you rackmount one or two Duplex direct boxes in 1RU.
Radial Engineering Ltd.
removable switch caps
When using the Duplex on a run of shows, it may
be preferable to set the switches at the beginning of
rehearsals and then remove the switch caps to prevent
the functions from being accidentally switched by
stagehands.
The easiest way to remove the switch caps is to take
the Duplex outer sleeve off and then gently push the
switch caps outward from the inside. You can also use
a pair of needle nose pliers to pull them off, but be
careful not to mar the switch caps when doing so. after
the tour is over, simply push the switch caps back on
and they will revert to normal use.
8
True to the Music
Push switch
caps off from
inside.
JDI • Duplex User Guide
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