Master audio SM Series Manual De Usuario página 19

that it is recommended to lower the general volume coming from the mixer our sound
source connected to that channel.
10 - CLIP-LIMITER CIRCUIT
This circuit prevents the amplifier from delivering distortion
at the loudspeaker outputs. Its action is practically inaudible
and protects the loudspeaker voice coils. A LED on the
front panel indicates the action of the clip limiter on each
channel. If the clip LED is lit intermittently, this may be
interpreted as correct, but it means that the amplifier is
reaching its maximum power at this point.
¡ Make sure this LED is not alight permanently ! No extra power is obtained in
this way losing dynamics and sound quality.
11 – PROTECTIONS
Temperature
An inadequate installation or any other anomaly related to cooling may cause the
amplifier's temperature exceeds the safety limits (>90ºC), exposing its internal
components to failure. If such a situation may arise, the corresponding protection
circuit will cause a stop during a certain time according to the anomaly detected. The
PROTECTION and LIMITER leds will light on at the same time, and the output of the
affected channel(s) will be disconnected.
Before the amplifier completely stops because of temperature problems, it will reduce
the output level by 6dB approximately. When the temperature back to normal
parameters, the normal output level will be re-established.
Short circuit
In case of very low impedance or short circuit in any loudspeaker output, the
LIMITER led is activated and a significant decrease of the output level of the affected
channel will be observed (loss of volume, but keeps working).
Output DC Current
In the case that due to some malfunction the power module tries to deliver DC
Current at the output, the protection circuit will immediately disconnect the module to
avoid loudspeakers damage. In that case, the PROTECTION and LIMITER led's will
light on at the same time and the output will be disconnected.
Other causes that could prevent the normal work of the amplifier can also activate
the PROTECTION. Under those circumstances, the installation has to be revised
according to the basic principles described below:
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