Read JBL J 820M (serv.man2) User Guide / Operation Manual online
INTRODUCTION
Congratulations on choosing JBL
J Series Loudspeakers. Their highly
accurate, uncolored and balanced
sound character will greatly increase
your enjoyment of recorded music
and movies. JBL speakers are built
with careful attention to detail, using
only the highest quality materials.
They will provide many years of
excellent performance.
J Series Loudspeakers. Their highly
accurate, uncolored and balanced
sound character will greatly increase
your enjoyment of recorded music
and movies. JBL speakers are built
with careful attention to detail, using
only the highest quality materials.
They will provide many years of
excellent performance.
The J Series is the result of combin-
ing traditional JBL Signature Sound
performance values with elegant
contemporary appearance.
ing traditional JBL Signature Sound
performance values with elegant
contemporary appearance.
Maximum Cone Surface Area:
The J Series transducers have been
designed to maximize the cone
surface area, a technology that
allows for shorter excursion of the
driver without sacrificing critical air
movement.
designed to maximize the cone
surface area, a technology that
allows for shorter excursion of the
driver without sacrificing critical air
movement.
Maximum Efficiency:
Larger air
movement coupled with shorter coil
movement allows the J transducers to
be very efficient. See specifications.
movement allows the J transducers to
be very efficient. See specifications.
Maximum Transducer Control:
Reduces distortion by tightening
the control of driver excursion and
increasing driver linearity.
the control of driver excursion and
increasing driver linearity.
Smooth, Accurate, Extended
Response:
Response:
The J Series transducers,
computer-optimized dividing net-
works, and bass reflex cabinets com-
bine to give clear, crisp, accurate,
JBL Signature Sound.
works, and bass reflex cabinets com-
bine to give clear, crisp, accurate,
JBL Signature Sound.
PLACEMENT
Bookshelf Models:
For the best
stereo reproduction, the two loud-
speaker systems should be an equal
distance from your listening position
and separated so that the angle
speaker systems should be an equal
distance from your listening position
and separated so that the angle
between them, at the listening posi-
tion, is between 40 and 60 degrees
(see Fig. 1). For example, if your lis-
tening position is 8 to 12 feet (2.5m
to 4m) from each speaker, the two
systems should be about 8 feet
(2.5m) apart. Placing the loudspeak-
ers in corners or against a wall will
result in the strongest (not necessa-
rily the most accurate) bass. Except
for the J50, all J Series speakers
have their ports in the front so you
can place the rear of the speaker up
against a wall. In the case of the J50,
do not place the speaker closer than
3 inches (75mm) to the wall behind it
if possible.
tion, is between 40 and 60 degrees
(see Fig. 1). For example, if your lis-
tening position is 8 to 12 feet (2.5m
to 4m) from each speaker, the two
systems should be about 8 feet
(2.5m) apart. Placing the loudspeak-
ers in corners or against a wall will
result in the strongest (not necessa-
rily the most accurate) bass. Except
for the J50, all J Series speakers
have their ports in the front so you
can place the rear of the speaker up
against a wall. In the case of the J50,
do not place the speaker closer than
3 inches (75mm) to the wall behind it
if possible.
For the best stereo imaging, we rec-
ommend that the systems be placed
so that the high frequency transduc-
ers are positioned approximately at
ear level of a seated listener. Every
room is different and there are differ-
ent tastes, so don’t hesitate to experi-
ment on your own.
ommend that the systems be placed
so that the high frequency transduc-
ers are positioned approximately at
ear level of a seated listener. Every
room is different and there are differ-
ent tastes, so don’t hesitate to experi-
ment on your own.
Tower Models:
The Tower models
cabinet height and driver placement
allow for speaker placement directly
on the floor. For the best stereo
reproduction, the two loudspeaker
systems should be an equal distance
from your listening position and sepa-
rated so that the angle between
allow for speaker placement directly
on the floor. For the best stereo
reproduction, the two loudspeaker
systems should be an equal distance
from your listening position and sepa-
rated so that the angle between
40°-60°
Fig. 1
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J Series OM 7/28/98 10:20 AM Page 2
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