audiophony WA-4x3 Benutzerhandbuch - Seite 10

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4 - 2 Protection systems
Because Audiophony knows what sound professionals need, your WA-4x3 are equipped with many
protection systems to guarantee the best possible lifespan for the internal components of your
amplifiers and all devices connected to their outputs.
- ACL (Active Clip Limiting)
The ACL system triggers when the amplifier has reached its full capacity or when the Clip threshold
has been reached. The Clip LED is lit continously to indicate the ACL is activated. The gain of each
channel is automatically reduced to protect the speakers from excessive sound levels which may
result in severe damages. The ACL activates during uncontrolled microphone feedbacks, incorrect
gain settings or failure of your amplifier internal components. Only excessive sound levels will trigger
this protection system.
- IGM (Instantaneous Gain Modulation)
The IGM system allows the amplifier to operate safely with load impedances close or equal to 2
Ohms. In case of excessively low load impedances, the IGM system will automatically adapt the
gain to a safe value. The IGM system is similar to the ACL: it is totally transparent most of the time
and only triggers in some situations. If the load impedance remains too low, the output relays will
deactivate the rear connectors.
- SoftStart system
Upon activation of your amplifier or activation of one of the protection system, the Softstart system
will slowly increase the output so the speakers will not have to deal with sudden peaks.
- Thermal protection
The thermal protection circuit will open output relays in case of excessively high temperature.
The Protect LED lights up during this process. In the power transformer temperature gets too high,
its temperature sensor will disconnect all power outputs, The Protect and Clip LEDs will light up while
the ON LED lights off. Cooling fans will continue operating at low speed and your amplifier will be
fully functional again once an acceptable temperature has been reached.
- Short-circuits
This protection takes effect upon detection of a short-circuit via one of the output (defective
loudspeaker, poorly isolated speaker cable, etc.).
This system detects short-circuits such as excessively low impedances and reduce the voltage
output of your amplifier to prevent the destruction of power transistors.
Affected outputs will be disconnected by the thermal protection system if the short-circuit continues.
- DC Offset protection
The output relays will open automatically to prevent damage to your speakers if one of the channels
detects direct current via one of its output connectors.
- Ultra-low frequencies (<20 Hz)
The internal high-pass filter gets rid off ultra-low frequencies. However, if such frequencies were to be
detected, a relay will eliminate them.
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WA-4x3 - 4 x 300 Watts Amplifier