QUALIA & Co INDIGO Series Owner's Manual - Caution
(6) Turn off the power.
Follow the steps below to turn off the power.
Lower the volume of the preamplifier to the minimum, turn off the power of the power amplifier, and then turn off the
power of this equipment.
Follow the steps below to turn off the power:
Tips for enjoying higher quality sound
Install this equipment as recommended by QUALIA & Co. and keep it powered up at all times if heat release is
not a problem. In this condition, be sure to keep the volume of the preamplifier at its minimum level. Since this
equipment handles weak signals, it takes some time for the circuits to reach optimal operating conditions. The best
sound performance can be obtained by keeping the equipment always powered up.
When the equipment is not going to be used for a long period of time due to travel or other similar reason, remove the power
plug from the wall outlet for safety. Keeping the power plug in the wall outlet may result in a fire. When pulling out the power
plug, do not pull the power cord. It may damage the cord, resulting in a fire or electric shock. Be sure to pull it out by holding
the plug.
When there is a risk of power outage or lightning strike due to a typhoon, heavy rain, or thunder, be sure to pull
out the power plug of this equipment from the wall outlet. A sudden power outage or lightning strike can damage
the Main Unit and connected equipment, which may result in a fire or electric shock.
16
Lower the volume
of the INDIGO
Preamplifier
Turn off the
power of the
power amplifier.
Turn off the power
of the source
equipment.
Turn off the power
of the INDIGO
Preamplifier
CAUTION
WARNING
●
When humming noise or other noise is generated
The INDIGO Line Amplifier is a wide-band amplifier. It is sensitive to high-frequency noise generated on the power
supply and digital noise generated on line cables. These noises are generated by various factors.
●
Digital noise often found on CD players, D/A converters, and PCs greatly influence preamplifiers and power amplifiers
of a system. In order to prevent negative influence of such noise on other equipment, take the power from an adequate
place and use a power strip or isolated power supply equipped with a noise filter.
●
Noise may come from a line cable.
Extra attention to noise is necessary when an unbalanced cable is used. Some cables are not very resistant to noise
(often expensive cables). Noise sometimes disappears when an ordinary cable is used.
●
Take consideration for ground loop.
Recently, power cords with grounding are often used. When many such cords are used, a common ground is used for
equipment connected to a power outlet and a complicated ground loop is generated due to relationships with signal
cables. As a result, a humming noise is sometimes generated of which the cause is hard to identify. In this case, attach
a three-prong to two-prong adapter to create a floating ground. This is a problem in the entire system, so try it with this
device (preamplifier) and your power amplifier to find the best position.
●
When a metal rack is used, cables making contact with the rack sometimes negatively influence the entire system.
Install cables so that they make an arc without making contact with any metal parts of the rack. If cables are heavy, lift
them by placing a woodpiece or something similar between the cables and the rack.