8
6.2 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.
6.3 Indicators
eHSA amplifiers include a simple yet effective indication system.
PROT/STBY indicators (7) show the absence of loudspeaker output signal. These
indicators may light up for following reasons:
During start-up, until the STANDBY time has passed. This time period is
needed for the internal operating voltages to settle.
A short circuit is detected at the loudspeaker terminals (PROTECT function).
When the module enters AUTO-STANDBY mode. In this case, the indicator will
illuminate in orange instead of red.
If these indicators remain lit in red, there's a malfunction that should be investigated to find
the cause of this lighting.
CLIP (2, 4) indicators light up when the signal level feeding the loudspeakers is just
below the actual clipping. This CLIP system takes into account possible variations
in the supply voltage, always giving a real indication. CLIP indicators light up to the
beat of low frequencies when working at high power levels ; it's normal as low
frequencies are those with higher energy content. You must take care that these
indicators do not remain continuously lit.
SP Signal Presence indicators (1, 3) indicate the presence of a valid signal at the amplifier
inputs.
The TH (THERMAL) (8) indicator lights when the unit has entered the protection mode due
to excessive temperature; normal operation is recovered when the amplifier internal
temperature comes back down to regular operating levels.
7.
CLEANING
The front panel should not be cleaned with dissolvent or abrasive substances
because silk-printing could be damaged. To clean it, use a soft cloth slightly wet
with water and neutral liquid soap; dry it with a clean cloth. Be careful that water
never gets into the amplifier through the holes of the front panel.
