7
3.5. Internal switches for high-pass filters
Inside the amp there are four jumpers to activate/deactivate the high-pass filter for each amplifier
channel, with a cutoff frequency set at 70Hz and a slope of 18dB/octave. The high-pass filter is
recommanded for some 100V line applications, especially when audio content is primarily vocal (public
address announcements, for example).
See the
SETUP DIAGRAM
for more information.
3.6. Remote control ports for attenuation
The HZA4-70F features 4 remote control ports labeled “
REMOTE CONTROL
” (35, 36, 37, 38) on
its rear panel. You can connect WPm series, REVO control panels etc. to each of these ports to remotely
attenuate the input signal (and therefore, the output volume of affected channels).
The maximum level of each amplification channel (and therefore its output volume) that can be
reached by the remote attenuator is determined by the position of its front knob (21, 22, 23, 24).
3.7.
REMOTE CONTROL
ports connection
The signal remote attenuation level for each input channel can be set by using 3 types of external
devices connected to the rear panel
REMOTE CONTROL
ports:
a) Using a remote potentiometer with nominal resistance between 10k
and 50k
, WPm series or
equivalent.
b) Using a device that generates a control voltage from 0 to 10V DC.
c) Using remote relays/dry contacts.
NOTE: you can connect up to 16 REMOTE CONTROL ports in parallel to the same hardware
control potentiometer. You have to merge the ground of all amplifiers belonging to these ports.
The connection cables can be up to 500m long if a section of 0.5mm
2
is used.
Consult the available accessories at your ECLER dealer or at www.ecler.com.
4. OPERATION AND USAGE
4.1. Start up
This will be done through the
POWER ON
(25) switch and the built-in indicator immediately lights.
In a complete audio installation, it is important to start up the equipment in the following
sequence: sound sources, mixer, equalizers, active filters, processors and finally power amplifiers. To
turn them off the sequence should follow an inverse pattern.
