BPX 2200.1 (serv.man11) - JBL Car Audio User Guide / Operation Manual. Page 7

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