Norma REVO CDP, Manual

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REVO CDP / DS-1 / User manual 1 • Controls and connections 3
1.3 Technical notes about inputs
The device must be able to make the most of their features.
Nothing in the listening chain should be overlooked,
starting with the interconnect cables, which must be of
excellent quality, very transparent and neutral. NORMA
products are of extremely high quality and will benefit
greatly with the use of appropriate cables.
Nothing in the listening chain should be underestimated,
from the quality of the cables to the position of the
speakers. For example, if used cables are of a low quality,
the resulting sound will be much less than the potential
of the device.
1.4 Warm up and run in
The warm up is a fundamental factor. For the best sound
performance, we recommend an initial run of about 200
to 300 hours of operation with active speakers connected
and music played at a normal listening level. After a long
period of inactivity, it is recommended to restore the run
in. Similarly, to obtain the best sound we recommend to
warm up the product for at least 3 - 4 hours.
1.5 The problem of hum
Frequently the connection of multiple devices can cause a
certain amount of hum, even when the individual devices
are entirely silent. Connecting equipment together can
create ground loops which can introduce in the audio
signal path a certain amount of network harmonics. This
problem, which also affects professional installations,
is long-standing and not easy to solve. Its influence is
particularly evident in the case of high gain amplifiers
and in the presence of signals of very low amplitude. The
situation may sometimes be particularly noticeable with
phono stages, turntables and pick-ups.
We point out some possible remedies:
• Reduce the connection cables length;
• Change signal cables and power cables position;
• Increase the distance between units, or arrange them
in a different way;
• Avoid using devices that can induce electromagnetic
fields or interference, such as electric motors, fluorescent
lights or halogen lamp low voltage transformers;
• It may be useful to increase the signal connection
shielding from one side of the termination. If a device
proves to be involved in hum problems and / or ground
loops contact the manufacturer to try to solve the
problem;
• The electrical safety is due to its connection to safety
ground. Before connecting and using the device, make
sure that the grounding system is efficient.
NORMA is not responsible for any damage caused
resulting from wrong system grounding, or failure
to follow safety procedures and regulations or a
disconnection made in any way to the ground security
equipment;
• Check that the mains power cable has a ground
connection and do not remove it, for any reason;
• LED TV’s or PLASMA TV’s emit large amounts of infrared
rays that can interfere with the IR remote control signal.