ATC HIFI Series User Manual

Either two or three cable connections are required for each subwoofer: one for mains power and one or two for the audio signal. The mains cable
is specically supplied to comply with local statutory safety approvals and alternatives should not be substituted. If you intend to use your subwoofer
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
subwoofer. The signal input pin conguration is illustrated in Diagram 1. If two signal connections are made to the subwoofer (i.e. a stereo pair) the
left and right signals will be summed by the amplier, increasing the eective input level to the amplier stage by 6dB.
Balanced cable conguration is the preferred option, however unbalanced connection is possible. Diagrams 2 and 3 illustrate the signal cable
connections required for each option. Balanced (XLR to XLR) connection oers 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.
Hum problems resulting from unbalanced connection may be reduced by making one of the following modications to the signal cable connections:
If the driving preamplier (or desk) 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.
SECTION FOUR
Connection Signal Cable Options
4.1 4.2
DIAGRAM 1
DIAGRAM 2
DIAGRAM 3

ATC HIFI Series Specifications

General

Brand	ATC
Model	HIFI Series
Category	Subwoofer
Language	English