7
5.4 Power saving mode
The AUTO STBY (10) switch allows to activate the automatic switching circuit calling the
power saving mode (low power consumption) when it detects no audio signal from the
unit's inputs during more than 90 seconds, and automatically recovering normal operation
when that signal reappears
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.
5.6 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.
6.
OPERATION AND USAGE
6.1 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.
