JBL L Series Troubleshooting

CROSSOVER

NETWORK

013-7600-05278-EP

WOOFER

16PR80BYG-DW02-EP

TWEETER

18DA25BF-DT01-EP

BLK

RED

RED

BLK

LS326C

104-c05278a0

0-e

b

a

c

L1

R3

R2

- T

+

C3

W+

C2

R

4

R1

W-

a

b

SWW

IN-

C1

SWT

IN+

EXPLODED

VIEW

WIRING DIAGRAM

9

11

11

7

6

10

5

4

3

2

1

8

JBL LS326C Studio

™

L Series

JBL Loudspeaker Troubleshooting/Repair Tips

Most customers prefer to do simple loudspeaker repairs themselves. By following the steps below, a majority of loudspeakers can be returned to

their original factory performance with minimum effort. Choose the example that best describes the problem you are experiencing.

Problem 1: No sound or distorted sound from one loudspeaker in a pair (or set)

Connect the dead/distorting loudspeaker to a different amplifier channel (one that had a functioning loudspeaker connected to it). If it functions

normally, the problem is not loudspeaker-related. If the loudspeaker still makes no sound or sounds distorted, a wire may have become loose 

or disconnected, the network (also known as a crossover) may be defective, the drivers (woofer, tweeter, etc.) may be defective or, in very rare

cases, all may be defective.

Refer to the wiring diagram and exploded view below. The network is a small circuit board found on the inside of the terminal cup, or mounted to

an inside wall of the enclosure. It sends low-frequency sounds to the woofer, high-frequency sounds to the tweeter and, if applicable, mid-frequency

sounds to the midrange driver. Make sure all wires are secure and connected. Look for components on the network that look burnt, “bulged,” 

or abnormal. If everything looks normal, connect the network to the drivers from another matching loudspeaker. MAKE SURE you attach the 

correct wires to each driver – mid- and low-frequency sounds can damage the tweeter! If there is still no sound or distorted sound, the network 

is defective. If there is clean undistorted sound, the drivers are defective.

Problem 2: No sound or distorted sound from one or more (but not all) drivers in an enclosure

Remove the problem driver(s) from the enclosure and make sure all wires are secure and connected. If they are, proceed with the following test:

Woofer or midrange driver – Connect the driver’s + and – input terminals directly to the loudspeaker wires from your receiver/amplifier and play

some music at a reasonable volume. If the driver now sounds normal (produces a clean, undistorted sound), the network is most likely defective.

Tweeter – Replace the tweeter with a functioning tweeter from another loudspeaker. If the tweeter now functions normally (produces clean,

undistorted sound), the original tweeter is defective. If the replacement tweeter also sounds distorted or produces no sound, the network is 

most likely defective.

Problem 3: Loudspeakers distort, rattle or pop at higher volumes

This is usually NOT a loudspeaker problem. Common causes are too much power (playing the loudspeakers too loud and causing them to distort),

an amplifier with not enough power (the amplifier can’t produce the required volume without distorting), excessive equalization (turning the tone

controls too far clockwise, and/or engaging the loudness/bass boost button on your receiver) or some combination of the above. If only one 

loudspeaker is exhibiting the problem, and you’re confident that it’s not caused by too little power/too much power/excessive equalization, see

solutions for Problems 1 and 2.

ITEM

PART NO.

DESCRIPTION

QTY.

1

329-060-05274-0WAE

GRILLE ASS’Y

1

2

352-CM04050D949-E

SCREW, DOG EAR

4

3

18DA25BF-DT01-EP

TWEETER ASS’Y

1

4

248-000-05008-0WAE

BAFFLE ASSEMBLY

1

(BAFFLE, DOG EARS, CAPS)

5

16PR80BYG-DW02-EP

6-1/2" WOOFER

1

6

013-7600-05278-EP

CROSSOVER NETWORK

1

7

352-CM04012D948-E

SCREW FOR TWEETER BRIDGE,

11

NETWORK AND WOOFER

8

316-PC-05201-0TAE

LOGO, GRILLE

1

9

051-C05275A-E

SWITCH – TWEETER LEVEL

1

SWITCH ASSEMBLY

ITEM

PART NO.

DESCRIPTION

QTY.

10

051-C05278A-E

SWITCH – BOUNDARY 

1

COMPENSATION

11

352-EM02508C961-E

SCREW FOR SWITCHES

4

12

221-060-05165-0TAE

PAINT TEMPLATE

1

13

402-000-05697-E

OUTER CARTON

1

14

404-000-05093-E

CUTTING TEMPLATE

1

15

405-000-05008-E

WARRANTY CARD

1

16

406-000-05527-E

OWNER’S MANUAL

1

17

431-000-05950-E

FOAM PACKING (TOP)

1

18

431-000-05957-E

FOAM PACKING (BOTTOM)

1

LS326C ROUGH-IN FRAME PART NO. RIF6CS