Hum problems resulting from unbalanced connection
may be reduced by making one of the following
modications to the signal cable connections: If the driving
preamplier is ‘double insulated’ (i.e. has no mains earth),
disconnect the signal cable screen at the RCA Phono
plug end. Alternatively, disconnect the signal cable screen
at the XLR end. This second option will make the source
the reference signal earth.
Two cable connections are required for each loudspeaker:
one for mains power and one for the audio signal. The
mains cable is specically supplied to comply with local
statutory safety requirements and alternatives should
not be substituted. If you intend to use your loudspeakers
in an alternative territory, please contact ATC for advice.
The mains connection must always be earthed.
The signal cable(s) and plug(s) should be of a good quality
and XLR terminated. Poor cable and plug quality will
compromise the performance of your loudspeaker.
The signal Input pin conguration is shown in diagram 3.
Balanced cable conguration is the preferred option,
however unbalanced connection is possible. Diagram 4
illustrates the signal cable connections required for
each option. Balanced (XLR to XLR) connection oers
lower noise and better immunity to ‘hum’ pick-up.
Unbalanced (XLR to Phono or Two Pole Jack) connection
carries risk of hum caused by multiple signal earths.
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