Marantz professional PMD-750T Guide D'utilisation page 49

• Use appropriate cables throughout your system. Do not use
excessively long cables (i.e. over 32 feet / 10 meters). Be sure plugs
and jacks are tightly mated. Loose connections can cause hum, noise,
or intermittents that could easily damage your speakers. Make the
input and output connections with readily available low-capacitance
stereo cables. Cable quality makes a big difference in audio fidelity
and "punch." See your Marantz Pro dealer or an electronics or audio
specialist store if you are not sure which cables to use.
• Never attempt to make any adjustments other than those described
in this manual, or repairs. Take the unit to your dealer or to an
authorized Marantz Pro service center.
• Always remember: turn amps on last and off first. Begin with master
faders or volume controls on minimum and the amplifier gain/input
control(s) down. Wait 8–10 seconds before turning up the volume. This
prevents transients which may cause severe speaker damage.
• Use restraint when operating controls. Try to move them slowly. Rapid
adjustments could damage equipment due to amplifier clipping.
• Avoid amplifier "clipping" at all costs: this occurs when the red LEDs
(usually on the front panel of most professional power amplifiers)
start flashing. "Clipping" is when the power amplifier is distorting
and working beyond its limits. Amplifier distortion is the main cause
of speaker failure.
• To prevent fire or shock hazard, do not expose the unit to rain or
moisture. Never place cans of beer, soda, glasses of water or
anything wet near or on top of the unit!
• Headphone outputs can be set to levels which can cause damage to
your ears. Use caution.
• This unit may contain a microcomputer for signal processing and
control functions. In very rare situations, severe interference, noise
from an external source, or static electricity may cause it to lockup.
In the unlikely event that this should happen, turn off the unit, wait at
least five seconds, and then turn it back on again.
• Under rare circumstances, if this product is exposed to
electromagnetic interference during use, there may be a slight drop
in signal-to-noise ratio.
• Intended electromagnetic environments: residential, commercial,
light industrial, urban outdoors.
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