Limiter Circuit; Output Connections; Operation And Usage; Start Up - Ecler eHSA Série Notice D'utilisation

3.5. 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.

3.6. Output connections

The output section on the rear panel features Euroblock connectors (15, 16).
The loudspeakers line has to be connected to the amplifier's 0V and 70V terminals (70V line) or 0V
and 100V terminals (100V line).
In STEREO mode, each channel takes the signal from its corresponding input (OUTPUT CH1 from
INPUT CH1, OUTPUT CH2 from INPUT CH2 etc.). In MONO mode, the signal is taken from the odd input
only.
The connection cable that joins the amplifiers outputs and the loudspeakers must be of good
quality, sufficient section and as short as possible. This is most important when the distances to cover
are long ones.

4. OPERATION AND USAGE

4.1. Start up

The red "PROT" LEDs (7) light up when you turn on the power switch (11). A second after all
voltages have been stabilized and the amplifier is operating, "PROT" indicators turn off.
In a complete audio installation, it is important to power on the equipment according to the following
sequence: sound sources (microphones, music players, etc.), mixers, equalizers, active filters and power
amplifiers. To power off, follow the reverse sequence.

4.2. Input attenuators

This consists of rotating potentiometers, situated on the front panel (5, 6).
These attenuators allow connecting the amplifier to different types of mixers and processors,
independent level control and connection of speakers that can't handle the wattage supplied by the output
stage at full power, without risking damage if the volume of the preamplifier-mixer is set too high.
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