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Figure 12. Typical multi-amplifier system
TROUBLE-SHOOTING SECTION
SYMPTOM PROBABLE CAUSE
1 No power Check connections to the amplifier's Ground, B+ & Remote
terminals. Check connection at "+" terminal of the battery.
Check the remote turn-on terminal. Ensure it receives power
when the source is turned on (or when the switch is turned
on). Refer to the Installation Section. Check the power line
fuse: if fuse is blown, replace it; if fuse continues to blow,
check the power wire and also the amplifier for a short. If the
short is in the power wire, fix it; if the short is in the amplifier
itself, see your Coustic dealer.
Check the voltage at the amplifier, and the remote ON/OFF
lead. The voltage should measure between 11 V-15V. If the
measurement is beyond this range, have the source unit
checked out by an authorized dealer.
2. Power without sound with Turn the amplifier off, and Check all input & output signal
red power/protection cables and connections. Check the speakers for short with a
indicator on VOM or by connecting them to another audio system. After
making sure everything is normal, turn the amplifier on again.
3. Power without sound with The continuous red light of the power indicator signals a high
red power indicator on internal operating temperature, which results in the amplifier
switching off temporarily; when the amplifier cools down to a
safe level, the amp will automatically restart.
4. No sound from one side Check balance control.
Check speaker connections.
Check signal input connection.
5. Very low sound from Check your radio's fader control.
both radio & tape Check the amplifier's Input Sensitivity Level.
6. Frequent automatic amplifier This indicates that the amplifier is operating at a continually
shut down undesirable high internal temperature.
High operating temperature caused by inadequate ventilation.
(Refer to the sub-section titled LOCATION for better amplifier
location).
High operating temperature caused by an excessively low
impedance load, say below 2 ohms. Check for bad speakers
and/or electronic crossover, proper passive crossover
components; if all else fails, try rewiring the entire system.
High operating temperature can be caused by an incorrect
input sensitivity level (refer to sub-section titled INPUT
SENSITIVITY ADJUSTMENTS for correct setting).
7. "Motorboating": The amplifier Check the amplifier's connection to the battery.
power indicator going off Check battery voltage. If low, recharge or replace battery.
repeatedly when the audio Check all ground connections.
system is on.
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231456
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400SE
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10RS
10" SUBWOOFERS
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OPTION 1 -RCA Outputs
OPTION 2 -Speaker lead Outputs
(Note: You cannot use both RCA and
speaker lead inputs simultaneously!!)
A
B
Battery
B
Anybody’s leased car: high power In dash
FRONT
speaker lead
outputs
RCA
outputs
FRONT speaker
lead Inputs
LoZ
option 2
FRONT RCA
lead Inputs
HiZ
option 1