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TM
PowerBass Series
PB10 Subwoofer
SERVICE MANUAL

JBL Incorporated
250 Crossways Park Dr. REV 0 7/00
Woodbury, New York 11797
PB10

TABLE OF CONTENTS
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Detailed Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Controls and their Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Speaker Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Test Setup and Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Exploded and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Amplifier Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Amplifier Faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Integrated Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Testing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

2
PB10

SAFETY INFORMATION

3
PB10

BASIC SPECIFICATIONS PB10 Subwoofer

4
PB10

DETAILED SPECIFICATIONS PB10 Subwoofer

5
PB10

PB10 Subwoofer Controls and their Function
1. Power - These lights will be red when the unit is
plugged in and not receiving a signal; when the PB10
Front Panel
receives a signal, the lights will cycle to GREEN. If no
signal is received after 10-15 minutes the lights will
cycle back to RED (standby) until a signal is present
again.
2. Level Control - The subwoofer Level Control, PB10,
(located on the rear panel) adjusts the volume of the
subwoofer relative to the rest of the system.
3. LFE/Normal Switch - Ordinarily placed in the Normal
position - but switch to LFE when playing Dolby
DigitaL, DTS or other digital surround modes - see
page 9.
4. Phase Switch - Changes the subwoofer's output to
be in phase or 180 degrees out of phase with the
program material. Rear Panel
5. Crossover Frequency - Sets the highest frequency
the subwoofer will reproduce.
6. Line Input - Main Input connection to subwoofer
(preferred).
7. Speaker In Jacks - Main Input connection to
subwoofer when line level, subwoofer, or pre-amp
output connectors are not available, or when a high
pass filter (set at 150Hz to main loudspeakers is
desired through the Speaker Output Jacks.
8. Speaker Out Jacks - Connected to main
loudspeakers when the Speaker Input Jacks are used.

6
PB10

Speaker Connection
When we designed the PB10 examples to determine which the hole through the
and PB12 powered description best matches your centerpost is visible under the
subwoofers, our goal was to system and follow the collar.
offer the user the best possible corresponding hookup
Insert the bare end of the wire
performance combined with instructions.
through the hole in the post,
the most flexible and complete
To use the binding-post then screw the collar back
installation options. Please
speaker terminals with bare down until the connection is
look over the following three
wire, unscrew the collar until tight. The holes in the center
of the collars are intended for
banana-type connectors.

Dolby Pro Logic (Non-Digital)-Speaker Level
Use this installation method for back of your front left and right
Dolby Pro Logic applications speakers.
(not Dolby Digital, DTS or Connect your receiver or
other digital processing), amplifier's center, left and right
where the receiver/processor surround-speaker terminals to
does not have a subwoofer the corresponding terminals on
output or a volume-controlled the back of your center, left
preamp (line-) level output: and right surround speakers.
Connect your receiver or
amplifier's front left and right
speaker terminals to the left
and right terminals on the
subwoofer that are marked
"High Level In." Connect the
left and right terminals on the
subwoofer that are marked
"High Level Out" to the
corresponding terminals on the

7
PB10

Dolby Pro Logic (Non-Digital)-Line Level
Use this installation method for position with Dolby Pro Logic- Make sure your receiver or
Dolby Pro Logic applications only processors. processor is configured
(not Dolby Digital, DTS or correctly; Make sure that the
Note: If your receiver or
other digital processing), subwoofer is configured as
amplifier only has one
where the receiver/processor is "On."
subwoofer output jack, then
equipped with a subwoofer
you may connect the Note for advanced users: If
output or a volume-controlled
subwoofer output on your your receiver/processor has a
preamp (line-) level output:
receiver/preamplifier to either built-in low-pass crossover
Use RCA-type patch cords to the left or right line-level input filter for the subwoofer output,
connect the line-level on the subwoofer. It makes no then the LFE switch should be
subwoofer outputs on your difference which jack you set to the "LFE" position to
receiver or amplifier to the line- choose. bypass the subwoofer's
level inputs on the subwoofer. internal crossover.
Connect each speaker to the
IMPORTANT: Make sure that
corresponding speaker
the LFE toggle switch on the
terminals on your receiver or
subwoofer is in the "Normal"
amplifier.
position. Do not use the "LFE"

8
PB10

Dolby Digital or DTS (or Other Digital Surround Mode) Connection

Use this installation method for you may connect the The front left, front right, center
Dolby Digital, DTS or other subwoofer output on your and rear speakers should be
digital surround processors: receiver/preamplifier to either set to "Small" or "Large"
the left or right line-level input depending on their size and
IMPORTANT: Make sure that
on the subwoofer. It makes no frequency response. Consult
the LFE toggle switch on the
difference which jack you your receiver's or processor's
subwoofer is in the "LFE"
choose. owner's manual.
position. Use the line-level
input jacks for the low- Connect each speaker to the
Frequency Effects channel. corresponding speaker
Connect these jacks to the LFE terminals on your receiver or
output or subwoofer output on amplifier.
your receiver or amplifier.
Make sure that you have
Note: If your receiver or configured your surround-
amplifier only has one sound processor for
subwoofer output jack, then "Subwoofer On"or "LFE On."

9
PB10

OPERATION
Power
When the unit is plugged in from green to red after the must be unplugged if you do
and the LEDs on the front of input signal to the subwoofer is not wish to leave it in auto
the unit will turn red. When a removed. Due to JBL's (standby) mode.
signal is present, the LEDs will unique, high-output, high-
turn green. efficiency amplifier design,
power consumption is minimal
Note: It will take several
when the subwoofer is not
minutes for the LEDs to turn
receiving a signal. The PB10

Level Control
The subwoofer Level Control room size, subwoofer
adjusts the volume of the placement, type of main
subwoofer relative to the rest speakers and listener position.
of the system. Proper level Adjust the subwoofer level so
adjustments depends on that the volume of the bass
several variables such as information is pleasing to you.

Crossover Adjustments
The Crossover Frequency
Control determines the highest
frequency at which the
subwoofer reproduces sounds.
If your main speakers can
comfortably reproduce some
low-frequency sounds, set this
control to a lower frequency
setting, between 50Hz-100Hz.
This will concentrate the
subwoofer's efforts on the
ultradeep bass sounds required
by today's films and music. If
you are using smaller bookshelf
speakers that do not extend to
the lower bass frequencies, set
the low-pass crossover control
to a higher setting, between
120Hz-150Hz. This control is
not used when the LFE switch
is in the "LFE" position.

10
PB10

Phase Control

The Phase Control determines bass output at the listening If at some time in the future
whether the subwoofer's position. you happen to rearrange your
piston-like action moves in and listening room and move your
Remember, every system,
out in phase with the main speakers, you should
room and listener is different.
speakers or opposite the main experiment with the phase
There are no right or wrong
speakers. There is no correct switch in both positions, and
settings; this switch offers the
or incorrect setting. Proper leave it in the position that
added flexibility to adjust your
phase adjustment depends on maximizes bass performance.
subwoofer for optimum
several variables such as
performance for your specific
subwoofer placement and
listening conditions without
listener position. Adjust the
having to move your speakers.
phase switch to maximize

TROUBLESHOOTING
If you used the high-level If there is low (or no) bass If you used the line-level
(speaker) inputs and there is output: inputs and there is no sound
no sound from any of the from the subwoofer: