Ecler essentials eHSA4-60, User Manual

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If you detect that the auto standby function is regularly and/or unexpectedly activated (i.e.
even if there is valid sound content at the amplifier's input), before changing the threshold,
check that the input signal level setting is adequate. For this purpose, the SP (Signal
Present) LED should be active when an audio signal is present, and the CLIP LED should
not light up or light up occasionally in line with the bass frequencies, which have the
highest energy content.
If the problem persists (the input audio signal has a wide dynamic range, for example),
change the detection threshold. First, remove the top cover of the unit by unscrewing the
screws that hold it to the chassis, to access the connectors inside, then reposition the
jumper for the channel you want to change the threshold to.
5.5 Limiter circuit
This is an extra protection always enabled in the eHSA series amplifiers. This circuit
dynamically limits the input signal to avoid clipping of loud signals at the amplifier output; it
automatically reduces the input level not to exceed approximately 5% distortion.
The great utility of this circuit in any type of installation should be noted; the advantage of
this system over traditional compressors is that dynamics is practically not altered, due to its
time constant.