Read JBL XTi SUB 300 User Guide / Operation Manual online
ENGLISH
BIWIRING
JBL XTI-Series loudspeakers may be connected to the
amplifier using two lengths of wire for each speaker. The
"biwire" connection method offers several options and
advantages.
The system's internal dividing networks are electrically
separated at the low frequency to midrange/tweeter tran-
sition. External strapping bars connect the two parts of
the network when a single wire connection is used. The
system is shipped from the factory with the strapping bars
in place. By removing the bars, connections may be made
to the individual network sections using two wires (four
conductors) as shown in Figure 1. The wires used may be
of the same type for both low frequency and high
frequency sections. The advantages are that wire effect
(resistance, inductance, etc.) are reduced and inter-
modulation of low and high frequencies in the cable are
avoided.
CAUTION: Never connect two amplifiers to the same
loudspeaker without first removing the strapping bars.
Operating two amplifier channels with the bars in place
may seriously damage the amplifiers and void the war-
ranty.
AMPLIFIER POWER
RECOMMENDATIONS
The JBL XTi-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 dis-
tribution 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 per-
haps, 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.
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 dis-
tortion at the highest sound levels required.
SPIKES
The JBL XTi-speaker can be fitted with "spikes" for the
best possible mechanical contact to the floor. In each cor-
ner of the bottom of the speaker is a threaded insert that
allows insertion of the spikes supplied with each speaker.
When mounting the spikes please make sure that each
spike has good contact to the floor beneath the speaker
before tightening the nuts on each spike.
GENERAL CARE
JBL XTi-Series loudspeaker systems are finished in materi-
als that will retain its finish for many years to come. Occa-
sional 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 gen-
tly clean the surface. Never use any abrasive cleaners or
strong chemical to clean the enclosure. In case of deep
Fig. 1: XTi input
Low Frequency
High Frequency
Amplifier
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