Yamaha S112IV Mode D'emploi page 2

Precautions
AVOID EXCESSIVE HEAT, HUMIDITY, DUST AND VI-
BRATION
When choosing a location for your speakers, avoid the fol-
lowing:
• Direct sunlight, high temperatures (such as near heat-
ers), or excessively low temperatures.
• High humidity.
• Areas subject to excessive dust accumulation and vibra-
tion.
• Non-level or unstable surfaces.
HOW TO POWER UP YOUR SOUND SYSTEM
To avoid damage to your speakers and other parts of your
system, when you turn on your system, ALWAYS turn the
power amp on last! This will avoid loud, damaging pops
that will annoy your audience, and blow your speakers.
When you power down, the amplifier should ALWAYS be
turned off first to avoid the same problems.
To protect your speakers
When choosing a power amplifier to use with your
speakers, make sure that its power output matches the
speakers' power capacity (refer to the Specifications on
page 6). Even if the amplifier's power output is lower
than the speakers' PGM (program) power capacity, the
speakers may be damaged when clipping of a high input
signal occurs.
The following may cause damage to speakers:
• Feedback caused when using a microphone.
• Continuous high sound pressure level produced by
electronic instruments.
• Continuous high-power output distorted signals.
• Popping noises caused by turning on equipment, or
by connecting or disconnecting system components
while the amplifier is turned on.
MAKE SURE THE POWER IS OFF BEFORE MAKING
OR REMOVING CONNECTIONS
Always turn the power switches of system components
OFF prior to connecting or disconnecting cables. Failure to
do so may result in damage to speakers as well as to con-
nected equipment.
DISCONNECT CABLES BEFORE MOVING THE SYS-
TEM
To prevent short circuits or breakage of cables, always dis-
connect cables prior to moving system equipment.
MATCH CONNECTOR POLARITY
When using two or more speaker systems, be sure match
the polarity (+/–) of the speaker system connectors to those
at the amplifier. If the polarities do not match, the sounds
produced by the speakers will interfere with each other,
making it impossible to achieve a well-balanced sound
field.
KEEP THIS OWNER'S MANUAL IN A SAFE PLACE
FOR FUTURE REFERENCE
All full-range loudspeakers are fitted with a self-reset-
ting poly switch that protects the high-frequency driver
from damage caused by excessive power.
If a loudspeaker cabinet loses high-frequency output,
immediately remove power from the unit and wait for
two to three minutes. They should allow the poly switch
to reset. Re-apply power and check the performance of
the high-frequency driver before continuing with the
power reduced to a level that does not cause the poly
switch to interrupt the signal.
On the SW118IV/SW118IVS sub woofer, the Poly
Switch protects the woofer and a similar routine should
be followed if its output is lost.
−2−
Poly Switch