Australian Monitor KA800 - Manual (Page 11)

3. Installation
Power Requirements
Model: KA800 KA800 KA800 KA800 KA800
Mains Voltage Fuse Rating
240, 220-230 8 Amps
Power consumption at idle = 120 Watts.
Power consumption at rated power = 1450 Watts.
Model: KA1200 KA1200 KA1200 KA1200 KA1200
Mains Voltage Fuse Rating
240, 220-230 10 Amps
Power consumption at idle = 160 Watts.
Power consumption at rated power = 2200 Watts.
Ensure that your mains voltage is the same as the
rear panel mains voltage marker (+/- 10%).
Mounting
Your amplifier is designed for standard 19" rack
mounting and occupies 2 EIA rack units (3.5"). The
mounting centers are:
Vertical: 3.0" (76.2mm)
Horizontal: 18.2" (461.2mm) to 18.7" (473.8mm).
The slots in the mounting flange will accept bolt
diameters up to 1/4" (6.35mm).
We recommend that you provide additional support
for the amplifier, especially if road use is planned, as
the weight can bend some racks otherwise. This
support can be provided by secure shelving, support
rails or a rear rack mounting strip to match up with the
rear rack mount ears provided on your
KA KA KA KA KA Series
amplifier.
Cooling
Each channel of your KA800/KA1200 KA800/KA1200 KA800/KA1200 KA800/KA1200 KA800/KA1200 amplifier is cooled
by an axial fan which draws cool air from the front of
the unit and expels the heated air from the rear of the
unit. These units offer two speed fans which run at
half speed, switching to full speed when the internal
heatsink temperature exceeds 60
0 C (128 0 F).
An unrestricted airflow into and out from the unit must
be provided. Any restriction of the air flow will cause
heat to build up within the unit and possibly force the
unit into its thermal shutdown mode.
If the units are to be operated in an environment
where the airflow is restricted such as sealed racks or
even when running 2 ohm loads, the cooling should
be supplemented by extra cooling fans to evacuate
the heated air and aid the flow of cool air through the
unit.
Input Wiring
IMPORTANT
Do not directly connect pin 1 on the amplifier’s input
or strapping XLR, to the amplifier’s chassis, speaker
ground or power ground!
NOTE
Input signal ground is not to be used as a safety
ground (earth).
The input to your amplifier is a balanced 3-pin system
and requires all three pins to be connected. Only high
quality twin-core shielded cable should be used.
When wiring for a balanced source the connector
going to the input of your amplifier should be wired as
follows:
Pin 2 = HOT (In Phase - non inverting).
Pin 3 = COLD (Reverse Phase - inverting).
Pin 1 = GROUND / SHIELD.
When wiring from an unbalanced source you must
ensure that pin 3 is connected to pin 1 (input ground),
either by linking the pins in the input connector or by
the source equipment's output wiring.
When wiring for an unbalanced source:
Pin 2 = Hot (in phase with the amplifier’s output),
Pin 3 = Ground/Shield (joins to pin 1).
Pin 1 = Ground/Shield
NOTE:
In-line XLR connectors often have a termination lug
that connects directly to the chassis of the connector.
Do not link this lug to pin 1 at the amplifier’s input as
it will defeat the amplifier’s input grounding scheme.
This lug is often referred to as a "drain” and is used
to provide a termination to the chassis for shielding
purposes when a floating signal ground is required
between the source and destination, or when
disconnecting the signal ground is required to reduce
earth loop noise, or noise induced into signal grounds
from stray magnetic fields.
Installation 11