Soundstream 405s Guía Del Usuario

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18 
PROTECTION CIRCUITRY
 
 
Your REFERENCE405s amplifier is protected against both overheating and 
short circuits by means of the following circuits: 
 
Main power supply fuses 
Circuit breakers on channels 1,2,3 & 4 
Smart Power Supply Thermal Rollback activating at 85°C 
A fail-safe thermal protection circuit activating at 95°C. 
 
Your amplifier also incorporates an innovative Fault Diagnosis system that 
identifies a blown power supply fuse. 
 
NOTE:  If you experience blown main power supply fuses, DO NOT increase 
values beyond the original fuse value!  Doing so will void your warranty and 
TROUBLESHOOTING
 
PROBLEM 
CAUSE 
No sound and LEDs 
are not lit 
no power or ground at amp 
no remote turn-on signal 
blown fuse near battery 
Fault LED is lit 
amp power supply fuse is blown or missing 
Repeatedly blown 
amp fuse, frequent 
activation of Smart 
Power Supply Circuit 
check speaker configuration, amp may be in 
“High Power” mode, put amp into “High Cur-
rent” mode if speaker load is less than 1 ohm 
(see p.8, “Setting High Power/High Current 
Switch”) 
speaker or leads may be shorted 
verify adequate amplifier ventilation 
Channels 1,2,3 or 4 
experiencing inter-
mittent output 
activation of the internal circuit breakers.   
check to make sure channels 1-4 are driving a 
2 ohm per channel load or greater 
speaker or leads may be shorted 
SERVICE
 
 
Your Soundstream REFERENCE405s amplifier is protected by a limited 
warranty.  Please read the enclosed warranty card. 
TABLE OF CONTENTS
 
 
 
Design Features 
................................................................. 4 - 5 
 
REFERENCE405s Diagram 
............................................... 6 - 7 
 
Setting the High Power / High Current Switch 
......................... 8 
 
Selecting Input Modes 
............................................................. 9 
 
Wiring & Wiring Diagram 
................................................ 10 - 11 
 
Installation and Mounting 
...................................................... 12 
 
Level Setting 
......................................................................... 13 
 
Crossover Adjustments 
......................................................... 14 
 
AIRBASS™ 
........................................................................... 14 
 
System Installation Diagrams 
.......................................... 15 -17 
 
Protection Circuitry 
................................................................ 18 
 
Troubleshooting 
.................................................................... 18 
 
Service 
.................................................................................. 18 
 
Specifications 
........................................................................ 19