User manual

SCM50/100/150ASL
1. Unpacking and Handling
The SCM50, 100 and 150 are large, heavy items and should be handled with care.
Always employ a second person to assist in moving it. Unpacking them requires a
large, open space, preferably near their final position.
• First lay the carton down and open the flaps on its side.While
holding the flaps apart turn the carton over so the open side is
on the floor.
• Lift the outer carton off the inner packing.
• Remove the end pad from the bottom of the monitor.
• The monitor can now be stood upright and the remainder of
the packaging removed.
2. Monitor Placement
The subjective performance of any monitor loudspeaker will be
influenced by the acoustic character of the room in which it is used,
and its position within the room. Most often monitors are installed in
rooms which are comfortable to sit and talk in. A mixture of carpets,
curtains and soft furnishings will help ensure that middle and high
frequencies are reasonably well controlled. There may however be
low frequency problems; either too much or too little bass. To
minimise low frequency problems the monitors should be kept away
from corners or walls. Start with them positioned on appropriate
stands around 1 metre from the side walls and 2 metres from the
back. If the balance is bass-light, the monitors can be moved towards
the back walls. Use the Bass Boost control (SCM Pro only. See
Paragraph 5.5) for fine tuning rather than to compensate for
inappropriate positioning. All rooms vary and it is a good idea to
experiment with both the listening and speaker position until a good
compromise is reached. For professional installations the
requirements are often very specific. Please consult with an
experienced professional acoustician if necessary. Monitors with an
asymetric driver array should be positioned such that the midrange
driver and tweeter are inboard. If the monitors are to be placed in any
form of cabinet, adequate side and top clearance for cooling airflow
must be provided.
3. Connection
Two cable connections are required for each monitor: one for mains power and one
for the audio signal. The mains cable is specifically supplied 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 Diagram 1.
3
Diagram 1 - input connection pins
Diagram 2 - balanced cable
Diagram 3 - unbalanced cable
Pin 1, ScreenPin 2, Signal (hot)
Two Core Screened Cable
Pin 3, Signal (return)
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
Two Core Screened Cable
3 Pin Male XLR
Connector
Phono (RCA)
Connector
To Monitor Input
Hot
Return
Screen
To Source Output
1
2
3
Installation