Installation; Placement, Mounting, Cooling; Mains Connection; Input Signal Connections - Ecler HSA2-400 Bedienungsanleitung

3. INSTALLATION

3.1. Placement, mounting, cooling

All HSA amplifier models are presented in standard 19" rack format and are 2 units high.
It is important that the amplifier, as a heat source, is not placed next to other equipment nor
exposed to high temperatures. The built-in convection cooling requires at least one free rack unit (empty
space) both above and below each amplifier to ensure a correct air flow.
It is also advisable not to rack the power amplifiers under other devices, but on top of these, as high
as possible toward the top of the rack cabinet.

3.2. Mains connection

The HSA amplifiers are fed with alternate currents, depending on the country, of 110-120,
220-240V 47/63Hz. (see characteristics in the back of the unit).
The mains cables must not be near the shielded cables carrying the audio signal, as this could
cause humming.
In order to protect the power amplifier from eventual power consumption overloads it is protected
by a set of fuses. Should a fuse blow, it must be replaced immediately by one with identical rating.
Should it blow again please contact our Technical Service Department. NEVER REPLACE THE FUSE
WITH ANOTHER ONE WITH A HIGHER VALUE.
CAUTION: Fuse substitutions have to be performed by a qualified technician.

3.3. Input signal connections

The signal input connectors are of XLR-3 and EUROBLOCK (15, 16, 17, 18) and electronically
balanced. The pin assignment is as follows:
Hot or direct signal
Cold or phase inverted signal
Ground
For unbalanced connections, ground the pin 3 on the XLR or the negative terminal on the
Euroblock.
In balanced mode, the input impedance is greater than 20k  (10k unbalanced), allowing you to
connect a large number of stages in parallel without compromising the sound quality.

3.4. Subsonic filter and Power saving mode

This filter cuts off inaudible frequency components which when amplified suppose a risk of
damage to the low frequency speakers as they generate excessive excursions of the woofer's
diaphragm. The filter of the HSAs, which has a Butterworth shaped response with 18 dB/oct slope, has a
cut-off frequency of 40 Hz and can be switched on or off via a switch on the rear panel (22).
The AUTO STBY 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
XLR-3
> Pin 2
> Pin 3
> Pin 1
EUROBLOCK
+
-
Ground
5