Kicker KEY200.4 Manuel D'utilisation page 13

LIMITER: The LIMITER may engage for multiple
reasons, as indicated by the LIMITER LEDs. This is
to protect your speakers and allow for continuous
playback. The LIMITER will engage during:
• Engine start: The KEY is a Start-Stop compatible
amplifier; it will not turn off during engine start. When your
vehicle's engine is starting there is a voltage dip in the
+12V line. In order to prevent a clipped output signal from
reaching your speakers, the LIMITER engages during
that moment. Should you be listening at a moderate or
higher volume level, you may see the LIMITER indicators
light up during engine start and turn off once the engine is
running.
• Low voltage: If the operating voltage fed to the amplifier
is below a level specified for full power operation (+10.8V),
you may see the LIMITER indicators light up at moderate or
high music volume levels.
• Input signal overdrive: When the input signal to the
amplifier causes its output to exceed the maximum rated
power, the LIMTER will engage to prevent severe clipping.
This can be caused by the gain setting or the input signal
being too high, or both. Reduce the gain or the strength of
the input signal.
The LIMITER engages as the amplifier reaches and
surpasses its maximum operational temperature, limiting
the power of the amplifier as the temperature rises.
Consequently, the temperature will take longer to rise until
an equilibrium is achieved in which the temperature won't
climb any higher, and the output power won't be limited any
further. This protection does not cutoff the audio abruptly
and it does not output clipped audio to the speakers.
• Compression switch ON: To fully protect your speakers,
you may turn the compression switch ON. This will cause
the LIMITER to engage whenever the amplifier is about to
output a clipped audio signal, though some distortion may
still be audible. If the gain is set properly and the audio
source doesn't clip, this will provide another fail-safe for
your audio system while limiting the current draw of the
amp, which lowers the load of the amp on the vehicle's
electrical system.
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