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The JBL Px300.4 amplifier can be set up
for stereo or tri-mode operation, as
shown in Figures 6 and 7. 

NOTE: For simplicity, Figures 6 and 7 do 
not show power, remote and input 
connections.

POWER

FUSES

GND

REM

BATT 

Px300.4

SPEAKER OUTPUTS

SPEAKER OUTPUTS

STEREO

REAR

FRONT

L

R

L

R

BRIDGED

NEON

NEON

FLAT HP

LP

MODE

FLAT HP

LP

MODE

ST

INPUT
MODE

MO

ST

INPUT
MODE

MO

POWER

FUSES

GND

REM

BATT 

Px300.4

SPEAKER OUTPUTS

SPEAKER OUTPUTS

STEREO

REAR

FRONT

L

R

L

R

BRIDGED

NEON

NEON

FLAT HP

LP

MODE

ST

INPUT
MODE

MO

Figure 6. The JBL Px300.4
amplifier is set to stereo mode
to drive front and rear pairs of
full-range speakers.

NOTE: To limit bass sent to 
full-range speakers, set 
X-OVER MODE to HP. See 
page 6 to set FREQ and SLOPE.

Figure 7. The JBL Px300.4 
amplifier is set to drive a stereo
component system and a 
subwoofer with a nominal
impedance of 4 ohms or greater.

NOTE: To drive a pair of rear
midbass speakers (instead of
subwoofer), set INPUT MODE 
to ST, X-OVER MODE to LP, 
and use DBO to set HP filter. 

SETTING THE 
OUTPUT MODE
Setting an output mode depends on
your choice of system configuration and
the nominal impedace of your speaker
system. JBL Power Series BPx
amplifiers provide rated power into 
any impedance between 1 and 4 ohms.
The BPx500.1, BPx1100.1 and BPx2200.1
amplifiers can be configured to provide
high voltage to loads of 2 ohms or
greater, or high current for loads below
2 ohms. 

Using the Bridge Mode 
If your speaker system has a nominal
impedance of 2 ohms or greater, bridge
the amplifier’s two channels to drive the
speaker(s). On BPx models, set the
OUTPUT MODE switch to 2CH/BR (see
Figure 2 on page 3).

Using the Parallel Mode 
(BPx Models Only)
If the nominal speaker-system 
impedance is less than 2 ohms, 
connect the two amplifier channels 
in parallel to drive the speaker(s), 
as shown in Figure 3 on page 3. 
On BPx models, set the OUTPUT MODE
switch to PARALLEL.

NOTE: If the nominal impedance of your
subwoofer system is close to 2 ohms,
try both series and parallel to determine
which mode provides the highest
volume. Use the I/E OPT LED according
to “Setting Input Sensitivity” on the
right.

Using the 2-Channel Mode 
With any Power Series amplifier, you
can also drive two woofers separately
by connecting the speakers in the 
2-channel mode (see Figure 1 on page
3). In this mode, the minimum nominal
impedance is 2 ohms. On BPx models,
set the OUTPUT MODE switch to
2CH/BR.

SETTING THE
CROSSOVER(S)
IMPORTANT: If you plan to use the
Px300.4 or Px600.2 to drive full-range
speakers, set the X-OVER MODE
switch(es) to FLAT and skip to the next
section, “Setting Input Sensitivity.”
1. Initially set the X-OVER FREQ 

control(s) midway. Later, when 
listening to music (in the next 
section), adjust them for least-
perceived distortion from midrange
and high-frequency speakers, while
allowing them to reproduce as much
bass as possible. 

2. Depending on your system plan, set

the X-OVER MODE switch(es) to LP
(low-pass), HP (high-pass), or FLAT.

3. For HP filters, set the X-OVER SLOPE

switch(es) to 24dB to limit bass and
provide increased system volume
with less distortion. 

For LP filters, use 12dB or 24dB
according to taste. However, using 
a 24dB slope will make bass less 
directional since midrange frequencies
are being filtered from the woofer’s
response. When choosing a low-pass
filter frequency for your subwoofers,
choose the highest frequency that will
remove vocal information from the
sound of the subwoofer.

SETTING DBO 
(ALL MODELS 
EXCEPT PX600.2)
Dynamic Bass Optimizer™ (DBO) is 
a new approach to enhancing low-
frequency reproduction in a vehicle.
Conventional bass boost controls add
bass at a fixed frequency and cause the
amplifier to consume considerable
power. DBO conserves valuable power
at the lowest frequencies and allows
you to adjust the level and “character”
of the bass sound, instead of just the
amount of boom.

Since a subwoofer in a vented box is
given to overexcursion below the tuned
frequency, set the HP FREQ control 10Hz
below the box’s resonant (tuned)
frequency (e.g., 30Hz for a vented box
tuned to 40Hz). Power typically wasted
in this region will now be conserved and
be available for frequencies the
enclosure will reproduce. Use the
BOOST Installation and setup control to
boost the bass at the set frequency by
as much as 12dB, as shown in Figure 8. 

Figure 8. Frequency response curves
show typical DBO control ranges for
selected JBL Power Series amplifiers.

SETTING INPUT
SENSITIVITY
NOTE: For BPx models, you can use the
supplied REMOTE LEVEL CONTROL
instead of the amplifier’s INPUT LEVEL
control to set input sensitivity. Connect
the remote module’s attached cable to
the REMOTE LEVEL CONTROL (RJ-11)
jack on the amplifier’s input panel. 
1. Initially, turn the INPUT LEVEL 

control(s) to the minimum 
(counterclockwise) position(s).

2. Reconnect the (–) negative lead to

your vehicle’s battery. Apply power to
the audio system and play a dynamic
music track from CD or tape. 

NOTE: After the source unit is on, blue
LEDs (on the top panel) will illuminate,
indicating the amplifier is on. If not,
check the wiring, especially the
remote connection from the source
unit. Also refer to “Troubleshooting”
on the next page.

3. On the source unit, increase the 

volume control to maximum position.
Slowly increase the INPUT LEVEL
control(s) (clockwise) towards three
o’ clock and observe the I-E/OPT LED
(on the amplifier top). At the ideal set-
ting, it should flash on musical peaks,
signifying maximum voltage is being
delivered in the 2-channel or bridge
modes, or maximum current is being
delivered in the parallel mode. If the 
I-E/OPT LED is on steadily, the
amplifier is being overdriven. Turn the
INPUT LEVEL control(s) back slightly
until the I-E/OPT LED flashes on
musical peaks.

-9

-6

-3

0

-12

20

80

Freq. (Hz)

dB

HP FREQ

100Hz

20Hz

-6

0

6

12

-12

20

80

Freq. (Hz)

dB

BOOST

 MAX

   MIN

For sealed enclosures, use DBO to
enhance the middle of the bass region.
Set the HP FREQ control to 35Hz to 40Hz
and adjust the BOOST control to taste.
This will make the bass sound bigger
and fuller. Alternatively, for tighter-
sounding bass, set the HP FREQ control
between 45Hz and 50Hz, and also adjust
the BOOST control according to your
preference.

For infinite-baffle applications, set the
HP FREQ control to the speaker’s F

S

value (to keep the subwoofer from 
trying to create bass below the
resonant frequency) and adjust the
BOOST control to taste. 

INSTALLING NEON TUBES
(OPTIONAL)
1. Using a Phillips screwdriver, remove

all screws on the amplifier’s
output/power end panel and set them
aside.

2. Using a 3⁄32-inch Allen wrench,

remove only the screws on the
amplifier’s (top) clear cover and set
them aside.

3. Remove the end panel and slide the

cover off. Set both parts aside.

4. Locate the enclosed hardware bag

and remove the four clips. Each clip
has a square end and a larger round
end. Using a round end, press two
clips onto each neon tube (e.g., Street
Glow AN9 or equivalent), as shown in
Figure 9 below.

5. For each tube, align both clips so the

square ends slide onto an exposed
extrusion edge, as shown in Figure 9.
Do not cover any screw holes. When
installed correctly, each neon tube
will sit under an extrusion and not be
visible when viewed from directly
above.

6. Route each neon tube’s power cable

through its respective NEON hole on
the end panel (see Figure 9). 

7. Slide the cover back into place and

reinstall its screws. Then, replace the
end panel and reinstall its screws.

8. Finish the installation of the neon

tubes as instructed in their owner’s
manual.

POWER

FUSES

GND

REM

BA

TT

 

SPEAKER OUTPUTS

BRIDGED

STEREO

Px600.2

L

R

NEON

NEON

PROTECT

POWER

I-E OPT

Figure 9.
Installing neon tubes in a JBL Px600.2 amplifier. 
Installation is similar for other models.

No audio 

No voltage at BATT+ 

Check voltages at

(POWER LED

or REM terminals, 

amplifier terminals

is off)

or bad or no ground 

with VOM

connection

No audio

DC voltage on 

Amplifier may need

(PROTECT LED 

amplifier output 

service; see enclosed

flashes every 

warranty card for

4 sec.) 

service information 

No audio 

Amplifier is

Make sure amplifier

(PROTECT

overheated

cooling is not blocked

LED is on)

at mounting location;
verify speaker-system
impedance is within 
specified limits (see 
“Specifications” on the 
next page)

No audio

Voltage less than 9V on 

Check vehicle

(PROTECT 

BATT+ connection

charging system for

and POWER

defective voltage 

LEDs flash)

regulator

I-E/OPT LED

Amplifier is being 

Check INPUT

is on all times 

overdriven

LEVEL setting; 

(not flashing)

see previous page 

No audio

Voltage more than 16V

Check vehicle

(PROTECT 

or less than 8.5V on

charging system for

LED is on)

BATT+ connection

defective voltage 

regulator

Distorted audio

Input sensitivity is 

Check INPUT 

not set properly, or

LEVEL setting; or

amplifier or source 

check speaker wires

unit is defective

for shorts or grounds

Distorted audio

Short circuit in 

Remove speaker leads

and PROTECT 

speaker or wire

one at a time to locate

LED flashes 

shorted speaker or 
wire, then repair 

Music lacks 

Speakers are not 

Check speaker

“punch”

connected properly

connections for
proper polarity

Power Output, 

75W x 4

150W x 2

N/A

N/A

N/A

4 Ohms

Power Output, 

150W x 4

300W x 2

250W x 2

575W x 2

1100W x 2

2 Ohms

Power Output, 

300W x 2

600W x 1

500W x 1

1100W x 1

2200W x 1

Bridged, 4 Ohms

Power Output,

N/A

N/A

500W x 1

1100W x 1

2200W x 1

Parallel, 1 Ohm

Min. Speaker

2 ohms

2 ohms

1 ohm

1 ohm

1 ohm

Impedance

Frequency 

11Hz ~ 45kHz, +1dB

10Hz ~ 45kHz, +1dB

20Hz ~ 320Hz, –3dB

20Hz ~ 320Hz, –3dB

20Hz ~ 320Hz, –3dB

Response

Input Sensitivity

250mV ~ 6V

250mV ~ 6V 

250mV ~ 6V

250mV ~ 6V

250mV ~ 6V

(RCA type)

THD + Noise

0.04%

0.04% 

0.5%

0.5 %

0.5 %

(4 Ohms)

Signal-to-Noise

95dB

95dB

93dB

93dB

93dB

Maximum

78A

78A

50A

110A

190A

Current Draw

Fuse 

30A x 2

30A x 2

30A x 2

30A x 3

150A x 1 external fuse

Replacement

Dimensions 
(H x W x L)

312mm x 432mm x 66mm 

312mm x 432mm x 66mm

312mm x 330mm x 66mm

312mm x 432mm x 66mm

312mm x 555mm x 66mm

Declaration of Conformity

We, Harman Consumer International

2, route de Tours
72500 Chateau-du-Loir
FRANCE

declare in own responsibility, that the product
described in this owner’s manual is in compliance
with technical standards:

EN 55013/A14:1999
EN 55020/A14:1999

Emmanuel Millot

Harman Consumer

International

Chateau-du-Loir, France 5/03

* BPx500.1, BPx1100.1 and BPx2200.1 amplifiers are 

performance-engineered by Crown.

JBL Consumer Products 

250 Crossways Park Drive, Woodbury, NY 11797 USA

© 2003 Harman International Industries, Incorporated

JBL and Power Series are registered trademarks, 
and Dynamic Bass Optimizer is a trademark, of 
Harman International Industries, Incorporated.

Part No. PSAMPOM5/03

www.jbl.com