ADJUSTING
HIGH
FREQUENCY
GAIN
Since
the high frequency characteristics of rooms
cannot
be predicted,
each
JBL
dividing
network
is provided
with
a high frequency level control,
which
makes
it possible to
achieve
a realistic tonal
.
balance
under
a variety of room conditions. The
acoustics
of your listening room and your personal
listening
taste
will
dictate the setting which
will
provide the most pleasing performance.
The control
enables
you to adjust the power fed to
the high frequency
transducer.
It
does
not affect
the
crossover
frequency, nor
does
it
limit
the
upper
frequency
response
of the
loudspeaker
system.
Some
experimentation
with
this control is usually
necessary
when the
system
is
first
installed in its
permanent
location. If musical reproduction
seems
to be
shrill
and edgy, turn the control counterclock-
wise to a lower setting. If it
seems
dead
and
dull,
turn
clockwise to a higher setting. Comparative
listening
tests
should be
made
at the usual listen-
ing
location.
Once
the control is set for
best
overall
results, it
need
not be
changed.
You can compen-
sate
for additional differences in
source
material
with
your preamplifier controls.
THE
MODEL N500
The JBL N500
dividing
network is a professional
unit
designed
primarily for
theater
installations.
It
is usually mounted on top of the
enclosure
or
in
some
other visible and convenient location.
All
terminal
screws
lying
on the white line are
common. The output
screws
on this line should be
connected
to the black
speaker
terminals. The two
screws
marked "LF" are internally
connected
so
that connecting an LF driver to
each
set of
posts
effectively
connects
the drivers in parallel.
The gain of the high frequency unit may be
adjusted by changing the position of the strapping
bar. Zero position provides the maximum intensity
level
of the HF unit. Each
successive
step
lowers
the HF level one db.
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