9
5.5. Internal switches for high-pass filters
Inside the amplifier 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).
section 9.1. Configuration Diagram for more information
5.6. Remote control ports for attenuation
The HZA4-120F 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).
5.7.
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.
Remark:
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
