C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual
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5.1 unpacking
Carefully open the shipping carton and check for any
noticeable damage. Every Lab.gruppen amplifier is
tested and inspected before leaving the factory and
should arrive in perfect condition. If any damage
is discovered, please notify the shipping company
immediately. Only the consignee may institute a
claim with the carrier for damage incurred during
shipping. Save the carton and packing materials for
the carrier’s inspection. Should you ever need to
ship the amplifier, always use the original packaging
materials.
5.2 Mounting
The amplifier is two rack units high (2U) and will fit
into a standard EIA 19” rack. The depth is 343 mm
(13.5”). The weight is approximately 8.5 kg (18.75
lbs.) depending on model type.
Free airflow from front-to-rear of the amplifier must
be possible. Therefore, no doors or rack-lids should
be mounted in front of or behind the amplifiers.
Amplifiers may be stacked directly on top of each
other. There is no need for spacing in between units,
though this might enable more convenient installation
of cabling on the rear panel.
It is recommended that rear supports be mounted
for maximum long-term stability.
5.3 Cooling
The amplifier uses a forced-air cooling system
with air flow from front-to-rear, maintaining a low
operating temperature within defined limits. Front-to-
rear airflow is preferred as cooler air is present at the
front in nearly all installed applications. (This allows
higher continuous power levels without encountering
thermal problems.) Never attempt to reverse the
airflow. The amplifier modules require a pressure
chamber between the fans and heatsink, and this
effect functions only in one direction.
Make sure that there is an adequate air supply in front
of the amplifier, and that the rear of the amplifier has
sufficient space to allow the exhaust to escape. If
the amplifier is rack-mounted, do not use covers or
doors on the front or rear of the rack.
Should a heat sink overheat, the temperature
sensing circuits will mute the overheating channel.
If the power supply overheats, another sensing
circuit will mute all output channels until the power
supply cools to safe operating temperature. An early
warning before shut down will be indicated on the
front-panel LEDs, and a warning will be sent through
the NomadLink network.
Always make sure that the dust filters behind the
detachable front-panel are clean to ensure maximum
possible airflow.
If the amplifier malfunctions due to dirty
dust filters, any required repairs are not
covered by the warranty.
To calculate the maximum heat emission value, when
installing the amplifiers in rooms with an air-conditio-
ning system, please refer to the Current Draw and
Thermal Dissapation specifications provided in the
Appendix section.
5.4 Operating voltage
All C…X amplifiers have a universal power supply that
accepts mains voltages from 100-240 V (+/- 10%) @
50 or 60 Hz. An IEC male receptacle is provided on
the rear panel of all amplifiers. The IEC cord included
with each amplifier has a male plug appropriate for
the power receptacles in the country in which it was
sold. If substituting a different IEC mains cord for
use in another country, use only a cord that meets
or exceeds the power rating of the originally supplied
cord.
Once a suitable AC supply is connected, the
amplifier can be turned on using the front-panel
power switch. The amplifier then goes through a
soft-start sequence as it self-checks its circuits. The
fans will blow at high speed before dropping to idle,
and the “power” LED will illuminate.
Inrush power is controlled and limited during “soft-
start”, enabling multiple amplifiers to be powered
up simultaneously with no danger of overloading the
mains power circuit.
INsTALLATION 5