4 :
C o n n e c t i o n ( A c t i v e M o d e l s )
Signal Cable Options:
Balanced cable configuration is the
preferred option, however unbalanced connection is possible.
Figs 3 and 4
illustrate the signal cable connections required for
each option. Balanced (XLR to XLR) connection offers 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 modifications to the signal cable connections: If the
driving preamplifier (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.
Connection:
Two connections are required for each monitor:
one for mains power and one for the audio signal. The mains
supply is supplied specifically to comply with local statutory
safety approvals and alternatives should not be substituted. If you
intend to use your monitors in an alternative territory, please
contact ATC for advice. The mains connection must always be
earthed. The signal cable and plug (not necessarily supplied)
should be of a good quality and XLR terminated. Poor cable and
plug quality will compromise the performance of your monitors.
The signal input pin configuration is illustrated in
Fig 5
.
Due to the nature of the electronics in ATC active loudspeakers,
it is quite normal for a sound to be heard from the speaker
when the power is applied or disconnected. The noise heard will
not damage the speaker. Although ATC use the highest grade
components, a different noise may be heard from each speaker
due to slight variations in the amplifier components.
Two Core Screened Cable
3 Pin Male XLR
Connector
3 Pin Female XLR
Connector
To Monitor Input
Hot
Return
Screen
To Source Output
1
2
3
1
2
3
Phono (RCA)
Connector
To Source Output
Two Core Screened Cable
3 Pin Male XLR
Connector
To Monitor Input
1
2
3
Hot
Screen
Return
Pin 1, Screen
Pin 2, Signal (hot)
Pin 3, Signal (return)
2
1
3
PUSH
Fig. 3 Balanced Cable
Fig. 4 Unbalanced Cable
Fig. 5 Input Connection Pins
ENTRY MANUAL 040919_ENTRY BROCHURE 13.3 10/09/2019 15:19 Page 9