The F1200 / F800 Protection Circuitry
The F1200 / F800 Protection LED relay speaker connection circuitry is active when the amp[[lifier is powered on or off. When the circuitry is active, and all connected speakers are muted (provided with 0 volts DC), thus protecting them and preventing any audible “thump” from occurring.
The following conditions will cause the Protection circuitry to activate:
•Initial
•Overheating: A temperature sensing device in the F1200 / F800 will cause the protection circuitry to be activated (and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the F1200 / F800 receives adequate ventilation on all sides and that both the front and rear panels are unobstructed.
•Severe overcurrent conditions: This occurs whenever the signal being input to the F1200 / F800 rises to a level above 20% THD (Total Harmonic Distortion).
•Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the F1200 / F800 short one another.
•Output impedance drops below 2 ohms: This can occur if the F1200 / F800 is connected to inappropriate speaker systems (see the “Setting Up and Using Your F1200 / F800” section on page 7 in this manual for more information).
•DC voltage detected at speaker output: The most likely cause of this is an inter- nal failure.
For further assistance, contact your local Samson dealer. If purchased in the United States, you can call Samson Technical Support
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