ATC Group SCM200 User Manual page 4

I n s t a l l a t i o n
1 . S y s t e m C o n f i g u r a t i o n
The SCM200/300ASL and P4 comprise active loudspeaker systems in which the P4
filter and amplifier unit can be located remotely from the monitors themselves. One
P4 unit is needed for each monitor. The P4 incorporates the appropriate three-way
active filters and four power amplifiers - 2 x Low Frequency, 1 x Mid Frequency, 1 x
High Frequency. Only one custom connector eight-way speaker cable is required to
connect each monitor to its P4 unit.
2 . U n p a c k i n g a n d H a n d l i n g
The SCM200 and 300 are large, heavy items and should be handled with respect.
Take particular care when opening the packing crates not to damage the monitors.
Always employ a second person to assist in moving them. Unpacking each monitor
requires a large, open space, preferably near its final position.
3 . P 4 I n s t a l l a t i o n
The P4 is designed to be free standing or rack mounted (using suitable rack
shelving). Adequate ventilation must be provided. The amplifier is cooled by forced
ventilation with air intake at the rear of the unit with an exhaust at the front. DO
NOT obstruct either front or rear vents or enclose the unit. The cooling fans will
run when the heatsink temperature reaches approximately 30°C.They will continue
to run, even when the amplifier is in standby mode, until the heatsink temperature
has dropped to approximately 20°C.
When a P4 is switched from standby to active operation a mild thump may be heard
from the unit as the main power transformer energises. In order to avoid excessive
in-rush current if multiple P4s are connected to a single power outlet it is
recommended that they are switched to active mode sequentially. It is unwise in
these circumstances to switch-on using the remote handset.
SCM200/300ASL/P4
4 . M o n i t o r P l a c e m e n t
The subjective performance of any monitor
loudspeaker will be fundamentally 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. For professional installations positioning
requirements are often very specific. Please
consult with an experienced
acoustician if necessary. SCM200 and 300 can be
soffit mounted. In this case it is especially
important to consult with a professional
acoustician.
Monitors with an asymetric driver array should be
positioned such that the midrange driver and
tweeter are inboard.
professional
3