DOWNLOAD JBL CS60.2 (serv.man2) Service Manual ↓ Size: 479.51 KB | Pages: 8 in PDF or view online for FREE

The CS subwoofer amplifiers are 
single-channel amplifiers. There are
two sets of terminals to make it easy 
to connect multiple woofers. Either 
set of (+/–) terminals may be used when
connecting woofers.

To the right are two application 
diagrams to help plan your subwoofer
system installation. Figures 4 and 5
show how to configure the CS300.1
subwoofer amplifiers.

NOTE: For simplicity, Figures 4 and 5
do not show power, remote and input
connections.

NOTE: Minimum speaker load is 
2 ohms.

Figure 4. CS subwoofer amplifier
with two woofers connected.

Figure 5. CS subwoofer amplifier
with one woofer connected.

Figure 6. CS60.4 amplifier in 4-channel (stereo) 
operation to drive front and rear full-range speakers.

Figure 7. CS60.4 is set up for 3-channel operation 
to drive a set of full-range speakers and a subwoofer.

Figure 8. CS60.4 used in bridged 2-channel mode to 
drive a set of components or subwoofers. Set crossovers
according to application.

The CS60.4 can be set up for stereo 
4-channel, 3-channel or bridged 
2-channel operation, as shown in
Figures 6 through 8. 

NOTE: For simplicity, Figures 6 through 8
do not show power, remote and input 
connections.

NOTE: Minimum speaker impedance for
stereo operation is 2 ohms.

Minimum speaker impedance for
bridged operation is 4 ohms.

Figure 9. CS60.2 used in 2-channel (stereo) 
operation to drive a set of full-range speakers.

Figure 10. CS60.2 used in bridge mode to drive a
subwoofer.

SETTING THE
CROSSOVER(S)
Determine your system plans and set the
crossover mode switch accordingly. 
If your system design does not include a
subwoofer with the CS60.4, set the
crossover mode to FLAT and skip to
“Setting Input Sensitivity”.

Initially set the crossover frequency 
control midway. While listening to music,
adjust the crossover for the least perceived
distortion from the speakers, allowing them
to reproduce as much bass as possible. 

Systems using a separate subwoofer set
the crossover mode to HP (high pass) for
your full-range speakers. Adjust the
crossover frequency to limit bass and
provide increased system volume with less
distortion.

For subwoofers, choose the highest 
frequency that removes vocal information
from the sound of the subwoofer.

If using the CS60.4 or CS60.2 to drive a 
subwoofer(s), set the crossover mode to 
LP (low pass).

SETTING INPUT
SENSITIVITY
1. Initially turn the INPUT LEVEL control(s)

to minimum (counter clockwise).

2. Reconnect the (–) negative lead to the

vehicle’s battery. Apply power to the
audio system and play a dynamic music
track.

3. On the source unit, increase the volume

control to 3/4 volume. Slowly increase
the INPUT LEVEL control(s) toward three
o’clock until you hear slight distortion 
in the music. Then reduce the INPUT
LEVEL slightly until distortion is no longer
heard. 

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

No audio 

No voltage at BATT+ 

Check voltages at

(POWER LEDs

or REM terminals, 

amplifier terminals

are off)

or bad or no ground 

with VOM

connection

No audio 

Amplifier is

Make sure amplifier

(POWER

overheated

cooling is not blocked

LEDs are on)

at mounting location;
verify speaker-system
impedance is within 
specified limits

Voltage more than 16V

Check vehicle

or less than 8.5V on

charging system

BATT+ connection

No audio

Voltage less than 9V on 

Check vehicle

(POWER BATT+ 

connection

charging 

system

LEDs flash) 

DC voltage on 

Amplifier may need

amplifier output 

service; see enclosed
warranty card for
service information 

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 POWER 

speaker or wire

one at a time to locate

LEDs flash

shorted speaker or 
wire, then repair 

Music lacks 

Speakers are not 

Check speaker

“punch”

connected properly

connections for
proper polarity