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PROTECTION DEVICES

THERMAL PROTECTION

When the ampliﬁer becomes overheated, this protection device puts the input audio signal into

the mute status until normal operating conditions have been restored.

This intervention is signalled by the simultaneous lighting of the LEDs “TEMP” and “MUTE”.

There is also a thermal protection for the toroidal transformer, which guarantees safety even

under extremely harsh operating conditions. This protection is inserted when the ampliﬁer works

over its capabilities.

As soon as the temperature reverses to the normality, all the functions will be restored.

The restore may take a quite long time, especially when the thermal protection concerns the

transformer, because its nucleus takes a long time to dissipate the accumulated heat.

DC, RFI PROTECTION

The ampliﬁer is equipped with relays on the audio outputs that protect loudspeakers in the

event of direct current, radio disturbance or subsonic frequencies and has an anti-bump function

during the initial ampliﬁer switch-on.

This protection is signalled by the lighting of the yellow LED “MUTE” on the front panel of the

ampliﬁer. The normal operation will be automatically restored as soon as the disturbance is

eliminated.

SHORT CIRCUIT PROTECTION

The ampliﬁer is equipped with a protection device against short circuits on the outputs. This

protection puts the input signal into the mute status and is signaled by the yellow LED “MUTE”,

which remains lit. During the mute status, the ampliﬁer tries to restore the signal;

the normal operation is restored as soon as the short circuit condition will be eliminated. This

protection is also activated when the ampliﬁer is delivering a too high current (too low load

impedance).

LIMITER

The ampliﬁer has 2 limiter circuits (one per channel) that ensure a correct operation with the

input signals (up to +10 dB above the correct level), optimise the ampliﬁer working and protect

loudspeakers against potentially damaging distorted signals.

RCF HC1600 User Manual

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