General Care - JBL Ti Serie Manual De Instrucciones

The biwire option also permits powering the system with two
amplifiers as shown in Figure 2. Four identical amplifiers (or two
dual channel units) may be used, although specialized low and high
frequency amplifiers can offer clear advantages. Your JBL Ti-Series
dealer can recommend amplifiers that best suit your needs. In all
cases, the left and right amplifiers for each section must be
identical. Ensure that the input sensitivity of the two amplifiers is
equal or that input level controls are provided to maintain proper low
to mid/high balance. If two identical stereo amplifiers are chosen,
each amplifier may be located near a loudspeaker and drive low
frequency and high frequency sections through short wire runs.
Beware that some amplifiers invert the polarity of the signal. Input
polarity should be the same for both low and high frequency section.
If the polarity is reversed to one section, a discontinuity in the free-
field response will be apparent in the crossover region.Feel free to
experiment with the polarity of the individual section to find a
position that will suit you best. Reverse the polarity to either high or
low frequency sections of both loudspeakers if a problem is
suspected. Amplifier polarity markings may not ensure correct
polarity connections.
AMPLIFIER POWER
RECOMMENDATIONS
The JBL Ti-Series speakers are capable of handling peak power far
exceeding the continuous rating specified for the individual
speakers.
The continuous ratings are based on an eight hour test using
broadband noise shaped to simulate the power distribution of
music. The peak rating of approximately 4 times the continuous
rating indicates the system's ability to handle transient peaks well
above the average power levels.
Amplifier power ratings are an INDICATION of how loud the system
will play without distortion. Amplifier power is generally measured
with steady state test signals and perhaps, in addition, dynamic
measurements into resistive loads. Unfortunately none of these are
firm indications of how loud the system will sound in a given
listening room.
For these reasons, an amplifier should only be chosen after careful
listening. If it is possible to achieve the desired volume level without
distortion, then the amplifier has sufficient power regardless of the
rating.
More important than the power rating is the quality of sound the
amplifier is capable of. Unfortunately, amplifier specifications are not
a reliable indicator of sound quality. Your JBL dealer can make
recommendations and arrange auditions to aid selection of suitable
amplification.
Fuses or circuit breakers of any kind should not be used between
the amplifier and loudspeakers. All such devices will seriously
degrade the sound quality and do not ensure protection from
loudspeaker damage. The key to safe operation is adequate
amplifier power to avoid distortion at the highest sound levels
required.

GENERAL CARE

JBL Ti-Series loudspeaker systems are finished in materials that will
retain its finish for many years to come. Occasional cleaning with a
clean, soft cloth will maintain the original beauty of the finish. Only
lint-free cotton cloths should be used for dusting. To remove
fingerprints and smudges, an ammonia-free window cleaner may be
used. Apply a small amount to a lint-free cotton cloth and gently
clean the surface. Never use any abrasive cleaners or strong
chemical to clean the enclosure. In case of deep scratches or
damage, please consult a qualified furniture repair shop.
GRILLE
The grille is held in place by a pin located at each corner. To remove
the grille, grasp two corners and gently pull the grille away from the
enclosure. To replace the grille, position the mounting pins on the
cups and gently press until the grille meets the enclosure. Although
the grille has been engineered to minimize acoustical interference,
high frequency response and stereo imaging will be improved by
removing the grille.
Any dust on the grille should be removed using a cleaning brush or
a vacuum cleaner.
SERVICE
JBL loudspeakers are designed to give years of trouble-free service.
No periodic maintenance is required. If a problem is suspected, first
make sure all connections are properly made. If a problem exists in
one loudspeaker, reverse the speaker wires to the left and right
system. If the problem remains in the same system, then the fault is
in the loudspeaker. If the problem appears in the opposite system,
the cause is in another component or cable.
Loudspeaker cones or diaphragms should not be moved by hand.
The voice coil assembly is located with extreme precision and the
clearance is very small. Any attempt to move the assembly by hand
can easily force the voice coil out of alignment and cause distortion
or failure.
Do not return products to the JBL factory without prior authorization.
Address correspondence to: JBL Customer Service, 250 Crossways
Park Drive, Woodbury, NY 11797, Telephone: 1-516-496-3400-
Outside the United States, contact your local JBL distributor.
Declaration of Conformity
We, JBL Europe A/S
Kongevejen 194B
DK-3460 Birkerød
DENMARK
declare in own responsibility, that the product described
in this owner's manual is in compliance with technical
standards:
EN 55 013/6. 1990
EN 50 081-1/1992
EN 55 020/4. 1994
EN 50 082-1/3.1995
EN 55 022/5. 1995
EN 60 065. 1993
EN 60 555 Part 2/4. 1987
Steen Michaelsen
JBL Europe A/S
Birkerød DENMARK 12/98 Birkerød. DENMARK. 06/98