Benchmark AHB2 - SOA Fault Diagnosis

AHB2 Instruction Manual Rev F Page 18
SOA Fault
The SOA (Safe Operating Area) of the output power devices is constantly monitored. If this safe
operating area is violated, both channels are muted to protect the amplifier and speakers. A power
reset will be required.
Fault Display:
 POWER light is On
 Both CLIP lights are On
 Both TEMP lights are On
 Both MUTE lights are On
Typical Causes:
 The load impedance of the speakers may be too low
 Speaker cables may be shorted
 Amplifier has been overloaded with a high-amplitude test tone
Required Actions:
 Check for shorted speaker cables
 Make sure the nominal STEREO load impedance is 3 Ohms or higher
 Make sure the nominal Bridged MONO load impedance is 6 Ohms or higher
 Turn down the audio source
 Restart the amplifier