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9
Use the POLARITY switch to
maintain proper acoustic
summation with the main
speakers. Listen to your PSW
subwoofer and main speakers
with the switch on "0˚", then listen
to the same material with the
switch on "180˚". Decide which
way sounds better and leave the
switch in this position. You should
repeat this procedure if you move
your PSW subwoofer to another
part of the room.
ALC PROTECTION CIRCUITRY
Your PSW series amplifier has a
built-in Automatic Level Control
circuitry that comes on
automatically when subjected to
high input signal levels. It helps to
protect the subwoofer driver from
being damaged by accidental mis-
use, assuring you of many years
of excellent performance.
GENERAL CARE
Use a damp cloth for cleaning
your PSW subwoofer cabinet.
Do not use detergents or other
cleaners.
TROUBLESHOOTING / SERVICE
Your PSW subwoofers should
only be serviced by an
authorized JBL repair station.
Woofers are replaceable by
repair station only. Do not
remove the amplifier from the
cabinet. There are no user-
serviceable parts inside.
Before seeking service for your
PSW subwoofer, please recheck
all connections as outlined in this
manual. Verify that your AC wall
power source is working properly
by checking with another
appliance.
CROSSOVER FREQUENCY
Use the crossover frequency knob
to adjust the upper end of the
subwoofer's frequency response.
The crossover control determines
the highest frequency your
subwoofer will reproduce. It allows
a seamless transition from
subwoofer to satellite speakers.
When using small satellite
speakers (without much low end),
you want the crossover frequency
more toward the upper end
(150 Hz) to fill in the sound your
satellites can't reproduce. When
using larger main speakers, a
setting more towards the 90 Hz
end gives a smoother transition
from your PSW subwoofer to your
main speakers. Experiment until
you find a setting that meets your
satisfaction.
Your PSW subwoofer turns itself
off internally. For extended
periods of non-use (i.e., vacations,
etc.) you may wish to unplug the
PSW subwoofer.
PLACEMENT –
CAUTION: Do
not place your PSW subwoofer
next to heaters, furnaces, or any
other heat sources. Be sure not
to pinch or compress the power
cord.
Since the low frequencies
produced by your PSW subwoofer
are non-directional, the placement
of your subwoofer is not critical.
You may place it under an end
table, next to the wall, next to
T.V., anywhere you would like.
However, the closer the
subwoofer is to walls, the more
bass will be realized. Corner
placement will result in maximum
bass output.
PSW 1000/1200 Owner’s Manual 7/28/98 10:15 AM Page 10