Balanced cable configuration is the preferred option, however unbalanced connection is possible. Diagram 5 illustrates 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.
The SCM25Ai Pro Mk2 connects to its remote mounted amplifier via connector panel in the rear face fitted with a Neutrik NL8 socket (for speaker
level audio) and a 5-pin female XLR connector (for power ‘on’/limiter ‘active’ LED indicator). See diagram 6.
The connectors fitted to the SCM25Ai Pro Mk2 are mirrored on the partnering amplifier.
Amplifiers and speakers are matched during production. Be sure to connect a speaker to its partnering amplifier. Serial numbers on the rear of the
amplifiers identify partnering loudspeakers.
Two types of cable are required:
1 NL8 to NL8 using 6 or 8-core speaker cable. Cables use connector pairs 1, 3, 4 wired pin-to-pin. Connector pair 2 is not connected.
ATC recommend a minimum cable conductor area of 2.5mm
2
/14G for cable runs of up to 5m/16’ and 4.0mm
2
/12G for runs up to 10m/33’.
2 Male 5-pin XLR to male 5-pin XLR. Cables use connector pins 1, 2, 3 and 4, wired pin-to-pin.
SECTION FOUR
SCM25A Pro M k 2 Cable Options SCM25Ai Pro M k 2 Connection
4.2 4.3
DIAGRAM 6
DIAGRAM 5
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