Limiter Circuit; Output Connections; Operation And Usage; Start Up - Ecler HSA2-400 Bedienungsanleitung

3.5. Limiter circuit

This system is an always active protection inside the HSA series of amplifiers. The ANTICLIP
circuitry constantly analyses harmonic distortion caused by excessive signal excursion at the power
amplifier's output and automatically reduces the input level in order never to exceed 5% total harmonic
distortion.
The great convenience of such a circuit in any kind of installation has to be remarked: The clear
advantage of a limiting system in front of conventional compressors is that the former does practically
not alter the dynamic range, acting only when the distortion threshold is reached.

3.6. Output connections

The output section on the rear panel features Euroblock connectors (10, 11, 12, 13).
In STEREO mode, each channel takes the signal from its corresponding input (OUTPUT CH1 from
INPUT CH1 and OUTPUT CH2 from INPUT CH2). In MONO/BRIDGE mode, the signal is taken from
INPUT CH1 only.
If you need to operate the amplifier in BRIDGED mode, you should place the "ST/MONO" (19)
switch in MONO position. The input signal connection is performed using the channel 1 connector and
the speaker output using BRIDGE labelled terminals on the Euroblock output connector.
When operating in BRIDGED mode, always makes sure that the resulting load impedance of the
installation is never below 5.3.
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 i.e. up to 10 meters it is recommended to use a section not inferior to 2.5mm
superior distances 4mm

4. OPERATION AND USAGE

4.1. Start up

Pushing the switch button (9) lights up the integrated pilot light and both red "CLIP" (1, 5) LEDs
during the approximately 10 seconds needed to stabilize all voltages. The "CLIP" LEDs will then turn off
meaning that the amplifier is now operative.
In a complete audio installation, it is important to start up the equipment in the following
sequence: sound sources, mixer, equalizers, active filters and finally power amplifiers. To turn them off
the sequence should follow an inverse pattern.

4.2. Input attenuators

This consists of rotative potentiometers, situated on the front panel (3, 6).
These attenuators allow to connect 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.
Inside the device's packaging you will find a little plastic bag containing 2 transparent caps which
protect the input attenuation settings from unwanted manipulation. These caps are transparent in order
to let you visualize the current settings.
Once inserted, they cannot be removed with bare fingers, for this purpose, a small screwdriver is
needed.
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