JBL lc-a504 Mode D'Emploi

JBL Consumer Products 
250 Crossways Park Drive, Woodbury, NY 11 797
8500 Balboa Boulevard, Northridge, CA 91329 
1-800-336-4JBL (4525) (USA only)
www.jbl.com

©

1999 JBL, Incorporated 

JBL is a registered trademark of JBL, Incorporated.

Part No. LC-AMPOM  3/99

A

m

p

l

i

f

i

e

r

s

30W x 4

37.5W x 4

75W x 2

20Hz – 40kHz

250mV – 4V

.10%

>

90dB

23A

2-5/16" x 8-5/16" x 11-5/8"

(58mm x 217mm x 297mm)

50W x 4

62.5W x 4

125W x 2

20Hz – 40kHz

250mV – 4V

.10%

>

90dB

42A

2-5/16" x 8-5/16" x 14-1/16" 

(58mm x 217mm x 357mm)

50W x 2

65 W x 2

130W x 1

20Hz – 40kHz

250mV – 4V

.10%

>

90dB

20A

2-5/16" x 8-5/16" x 7-9/16" 

(58mm x 217mm x 191mm)

75W x 2

90W x 2

180W x 1

20Hz – 40kHz

250mV – 4V

.10%

>

90dB

26A

2-5/16" x 8-5/16" x 12-1/2"

(58mm x 217mm x 317mm)

No audio (power indicator is on).

Speakers or input-signal cables disconnected; 

Check connections, source, speakers.

defective speaker or source unit.

No audio (power indicator is off).

No voltage at BATT or REM terminals; 

Check voltage at amplifier terminals

bad ground connection.

with VOM. Repair faulty connection.

No audio (power indicator is off, 

Amplifier protection is engaged due to 

Disconnect speaker leads one at 

voltage at terminal OK).

overheating; shorted or defective speaker 

a time to determine which speaker 

or speaker cable.

or wire is shorted or defective. 

Repair the short circuit or replace 

bad speaker.

Distorted audio.

Input sensitivity not set properly; amplifier 

Check LEVEL setting; check source 

or source unit defective.

unit.

Music lacks "punch".

Speakers are not connected properly.

Check speaker connections 

for proper polarity.

LC-Amplifier OM   3/4/99  10:55 AM  Page 1