User Responsibility; Mains Connection Grounding; Speaker Output Hazard; Radio Interference - Lab.gruppen C 68:4 Operation Manual

3.3 user responsibility

3.3.1 Mains connection grounding

Your amplifier must be connected to a
grounded socket outlet.

3.3. Speaker output hazard

Power amplifiers are capable of producing
hazardous output voltages. To avoid electrical
shock, do not touch any exposed speaker wiring
while the amplifier is operating. The external wiring
connected to the speaker terminals shall be installed
by a qualified instructed person or ready-made leads
or cords of appropriate capacity shall be used.

3.3.3 Radio interference

As the amplifier outputs produce high voltage,do
not connect or disconnect speaker cables when
the mains power is on. Also, attach the safety cover
on the speaker terminals for safe operation and to
comply with electrical product approvals.
A sample of this product has been tested and complies
with the limits for the European Electro Magnetic
Compatibility (EMC) directive. This equipment has
also been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference
from electrical equipment. This product uses radio
frequency energy and if not used or installed in
accordance with these operating instructions, may
cause interference to other equipment, such as radio
receivers. However, there is no guarantee that inter-
ference will not occur in a particular installation.
If this equipment does cause harmful interference
to radio or television reception, which can be deter-
mined by turning the equipment on and off, the user
is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the antenna.
• Increase the separation between the equipment
and receiver.
Connect the equipmnt into an outlet on a
•
circuit different from that to which the receiver is
connected.
• Check if the affected unit complies with the EMC
limits for immunity, (CE-labeled). If not, address
the problem with the manufacturer or supplier.
All electrical products sold in the EC must be
approved for immunity against electromag-
netic fields, high voltage flashes, and radio inter-
ference.
• Consult the dealer or an experienced radio/TV
technician for help.

3.3.4 Speaker damage

Your amplifier is very powerful and can be
potentially dangerous to both loudspeakers and
humans alike. Many loudspeakers can be easily
damaged or destroyed by overpowering, especially
with the high power available from a bridged
amplifier.
Always check the speaker's continuous and peak
power capabilities.
Even if though the amplifier's front panel attenuators
can be used to reduce the gain, it is still possible to
reach full output power if the input signal level is
high enough.

3.3.5 Maintenance

For long-term and safe operation it is recommended
that the amplifier dust filters on the front panel, as
well as the inside of the amplifier is cleaned regularly.
If the dust filters and inside are not maintained there
will be safety risks. For example the amplifier can
ignite the dust and a fire will occur due to high internal
temperatures. There is also a risk that the amplifier
will malfunction since the amplifier is dependent
of constant airflow from front to rear. If the dust
filters are not clean and the amplifier malfunctions,
any resultant problems will not be covered by the
warranty.
C Series Operation Manual 5
WARNINGs 3