Legacy Car Audio SHARP STEEL LA-1099 - Manual (Page 6)

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.
High hiss or engine noise (alternator whine) in speakers.
• Disconnect all RCA inputs to the amplifier(s) – if hiss/noise disappears, then plug in the component driving the amplifier and unplug its inputs. If hiss/noise disappears, go on until the faulty/noisy component is found. • It is best to set the amplifier's input level as insensitive as possible. The best subjective S/N ratio is obtainable this way
.
T
ry to drive as high a signal level from the head unit as possible.
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
.
High squeal noise from speakers.
• This is almost always caused by a poorly-grounded RCA patch cord.
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.
STOP
YES!
NO!
2 -c hannel
Amplifier
(Operating in Stereo)
4 ohm 4 ohm
Two 4-ohm speakers, wired in stereo, will present a 4-ohm load to each channel of the amplifier. Most two- channel amplifiers will work well in this configuration.
Two 4-ohm speakers, wired in parallel to a bridged two-channel amplifier. will present a 2-ohm mono load to the amplifier.
MOST TWO-CHANNEL
AMPLIFIERS DO NOT SUPPORT 2-OHM MONO OPERATION! AMPLIFIER DAMAGE COULD RESULT!
s ound
a round,
I nc.
1600 63rd
s treet.
b rooklyn. ny 11204
4 ohm 4 ohm
2 -c hannel
Amplifier
(Operating in Bridged Mono)
STOP
YES!
NO!
Four 4-ohm speakers, wired in stereo, will present a 4-ohm load to each channel of the amplifier. Most four- channel amplifiers will work well in this configuration.
Four 4-ohm speakers, wired in parallel to a bridged four-channel amplifier, will present a 4-ohm mono load to the amplifier.
MOST FOUR-CHANNEL
AMPLIFIERS DO NOT SUPPORT 2-OHM MONO OPERATION! AMPLIFIER DAMAGE COULD RESULT!
4 -c hannel
Amplifier
(Operating in Bridged Mono)
4 ohm 4 ohm 4 ohm 4 ohm
4 -c
hannel
Amplifier
(Operating in Stereo)
4 ohm 4 ohm 4 ohm 4 ohm
tr
oubleshooting
T
r
oubleshooting
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