LA370 LA470 LA570 LA770 LA970 LA1470 LA1870 LA2070
2CH AMPS
Bridged Mono Output
MINIMUM
SPEAKER
IMPEDANCE
speaker 4 OHMS!
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Subwoofer
2 CH Stereo plus Mono-Bridged Subwoofer Output
LA670 LA870
4CH AMPS
LA670
Amplifier will not power up.
•Check for good ground connection.
•Check that remote DC terminal has at least +12v DC.
•Check that there is battery power on the + terminal.
•Check all fuses.
•Check that Protection LED is not lit. If it is lit, shut off amplifier briefly and then repower it.
11
TROUBLESHOOTING
Before removing your amplifier, refer to the list below and follow the suggested procedures. Always test the speakers and their wires first.
LA870
4CH AMPS
speakers
MINIMUM
L SPEAKER IMPEDANCE
4 OHMS!
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| High hiss or engine noise (alternator whine) in |
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| speakers. |
| 2 CH | • Disconnect all RCA inputs to the amplifier(s) – if hiss/noise | ||
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| disappears, then plug in the component driving the amplifier |
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| and unplug its inputs. If hiss/noise disappears, go on until the |
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| faulty/noisy component is found. |
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| • It is best to set the amplifier's input level as insensitive as |
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| possible. The best subjective S/N ratio is obtainable this way. |
R | Try to drive as high a signal level from the head unit as possible. | |||
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Protection LED comes on when the amplifier is powered up.
• Check for shorts on speaker leads.
• Check that the volume control on the head unit is turned down low.
• Remove speaker leads, and reset the amplifier. If the Protection LED still comes on, then the amplifier is faulty.
Amplifier(s) gets very hot.
•Check that the minimum speaker impedance for that model is correct.
•Check for speaker shorts.
•Check that there is good airflow around the amplifier. In some applications, an external cooling fan may be required.
Distorted sound
•Check that the Level control(s) is set to match the signal level of the head unit.
•Check that all crossover frequencies are properly set.
•Check for shorts on the speaker leads.
High squeal noise from speakers.
•This is almost always caused by a
| troubleshooting |
Speaker Connections | Troubleshooting |
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