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i D - S e r i e s
A D V A N C E D A M P L I F I E R S
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O P E R A T I O N
Applying analogue signal again will not wakeup the amplifier again. When unsing
analogue input signal, exiting the automatic standby mode must be done manu-
ally through the user interface or the DSPControl remote application. So please
consider this carefully before using the Auto Standby function with analogue
input signal.
5.4 Power Amp Protection Systems
5.4.1 Clip Limiter / Underimpedance Limiter
The DSP section of the iD4 / iD7 offers various limiter and compressor settings,
both on the signal inputs and on the signal outputs. Those limiters and compres-
sors can be adjusted and even switched off completely if desired.
Disabling the limters is done by setting the thresholds to their highest values.
But in case the amplifier is driven into hardware clip (i. e. when the Clip-LED is
glowing orange or red) for longer periods of time, the "threshold" setting of the
"output limiter" will automatically be reduced temporarily.
Note that this is automatically done inside the amplifier and cannot be seen in
the DSPControl application.
This automatic threshold reduction will especially take place at low output
impedances (smaller 4 Ω) and high output powers and shall prevent the ampli-
fier from being operated in continuous hard amplifier cliping.
5.4.2 SOA Protection
Whenever the power transistors leave their Safe Operation Area (SOA), the
SOA-protection switches back the rail of the respective channel.
5.4.3 DC Protection
Each output of the power amp is constantly monitored for persistent DC voltage
levels. If the 3 V thresholds are exceeded at any of the outputs, the correspond-
ing channel will be muted. If DC was only detected for a short moment, the ampli-
fier will release mute and work as normal. If DC is detected for longer periods or
repeatedly, the amplifier will switch to standby mode and disable the main power
supply. If this happens the display will indicate "Error – amp switched off" .
In this case, switch off the amplifier for at least 4 minutes and switch the ampli-
fier on again.
U S E R M A N U A L
5.4.4 Over Current Protection
Over current is permanently controlled in the output stage. There are two limit ing
levels of over current depending on output voltage. These limits will be set auto-
matically. This improves reliability without degrading sound quality when driving
complex loads.
5.4.5 Thermal Protection
There are several sensors inside the amplifier in order to ascertain tem perature
data. If a temperature of more than 85 °C is detected at the heat sinks, the input
signal on that channel is reduced.
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