7
Protection Features
General Protection:
Each Face Audio® amplifi er incorporates special circuitry to protect the amplifi er and at-
tached speakers under most circumstances. Face Audio® has tried to make the amplifi er as
fail-safe as possible by making it resistant to short and open circuits, DC voltage and over-
heating. When certain problems occur that cause a channel to enter Fault mode, the Fault
mode LED for that channel will illuminate. Occurrences of DC voltage at output, excessive
subsonic frequencies and thermal overloads will cause the channel’s output relay to discon-
nect the speaker load until the problem is corrected or the amplifi er cools down
.
Thermal Protection:
Face Audio® amplifi ers utilize a continuous variable speed blower to assist in cooling. The
blower will change speed in response to the amplifi er’s cooling needs. This way the amplifi er
maintains an internal temperature within the required range for continued operation under
normal working conditions. If a channel’s heat-sink reaches 194F the channel will disconnect
its load and the Fault LED will illuminate. Normal operation will resume once the temperature
cools down to 176F. Should this occur it may be an indication of obstructed airfl ow due to
poor placement of the amplifi er, a clogged air fi lter or excessive dust buildup on the inside of
the unit.
Short Circuit:
A short circuit protection system safeguards the amplifi er’s output transistors, in the event
of short circuit or and other stressful loads the channel will protect itself by automatically
disconnecting the load. In case of short circuit the Fault LED will illuminate, power-off the
amplifi er to reset it.
DC Voltage Protection:
If the amplifi er detects DC voltage on a channel at its output, it will fault to protect the speak-
ers. Should this happen the Fault LED will illuminate.
Power-on/Power-off Muting:
The amplifi er outputs are muted for approximately 4 seconds after power-on and immediately
after power-off to prevent thumps or pops from being heard.
Speaker Protection:
All Face Audio® amplifi ers inherently protect speakers from DC voltages, subsonic signals
and excessively high frequency signals. However, it is very important that users are aware
of the application limits of their speakers and be sure that the amplifi er does not exceed
the speaker’s power capabilities.
Face Audio® will not be responsible for damaged
speakers.
Limiter:
Face Audio® amplifi ers come with built in limiters to prevent inadvertent damage to it or
equipment attached to it by less experienced users.
