powersoft Quattrocanali Series User Manual

English
4 : 6.Gain selection
The Quattrocanali Series ampliers can operate with
different gain applied to the input signal. This feature is
designed to match the voltage of the input signal, i.e. allowing
to obtain the same output power at different input levels.
GAIN
Input sensitivity @ 8Ω load
Vpeak Vrms dBu
4804
26 6,92 4,9 16,0
29 4,90 3,47 13,0
32 3,46 2,45 10,0
35 2,45 1,74 7,0
2404
26 4,89 3,46 13,0
29 3,48 2,46 10,0
32 2,45 1,74 7,0
35 1,74 1,23 4,0
1204
26 3,46 2,45 10,0
29 2,46 1,74 7,0
32 1,72 1,23 4,0
35 1,23 0,87 1,0
TAB. 2: Input sensitivity.
A proper combination of the position of two GAIN
switches on the rear panel sets the operating gain of the
amplier (see TAB. 3)
26 dB 29 dB 32 dB 35 dB
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
26 dB 29 dB 32 dB 35 dB
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
TAB. 3: Setting the GAIN.
4 : 7.Lo-Z 2Ω load operation
The Quattrocanali Series ampliers are optimized for
working with 4Ω output loads but a special configuration
allows to connect low loads down to 2Ω (e.g. in the
configuration with three paralleled 8Ω loudspeakers that
provides 2.67Ω load to the output channel).
The 2Ω switch (see Panel D, p. 5) allows to activate
on all output channels set to match low impedance (i.e. in
Lo-Z configuration) an operating condition that optimizes the
performance with very low loads, by limiting the maximum
output voltage to 85V
peak
per channel.
For optimal 2Ω performance, it is recommended to
select LowZ mode for all the amplifier’s channels
4 : 8.Diagnostics - GPO - Alarms
The Quattrocanali’s GPO – general purpose output –
system implements triggering signals to broadcast alarms.
Quattrocanali Series provides a pair of paralleled general
purpose output connections per channel: one Normally
Open
NO and one Normally Closed NC.
The connections are available on the back panel via the
12-pin Phoenix MC 1.5/12-ST-3.81 1803675 connector: see
Panel F, p. 6 for wirings.
These contacts are used to report potentially dangerous
faults or generally unsafe operation conditions by toggling
alarm switches relative to the following events, and any fault
preventing the normal operation of an output channel:
 No AC mains (i.e. system shutdown);
 Thermal stress: the system temperature is too high
and the thermal protection is engaged;
 Short circuit in output wiring: either the loudspeaker or
the line is in short;
 Amplier is in Standby
Quattrocanali DSP+D features further monitoring on
pilot tone and output load: the monitoring and diagnostic
interface is accessible in Armonía Pro Audio Suite software
through the Diagnostic tab in the output ways panel of the
selected channel of the Quattrocanali DSP+D amplier.
4 : 8.1. Pilot tone monitoring
Thanks to the built-in DSP, the Quattrocanali DSP+D
ampliers implement pilot tone detection and alert.
Detecting and alerting features are available for both input
and output pilot tones on each channel.
The detection of a mismatch in the input pilot tone
parameters (frequency and voltage level) can be used to
trigger the backup policy and activate an alert through the
general purpose output switch.
The output pilot tone detection relies on an external
signal passing through the amplier or the internal post DSP
pilot tone generator; in both cases any mismatch between
the detected signal and the set thresholds triggers the
general purpose output switches.
4 : 8.2 . Output load monitoring
Through the Armonía Pro Audio Suite software it is
possible to set the thresholds on the load impedance, at
given frequency, that trigger the general purpose output of
any channel in Quattrocanali DSP+D ampliers.
FIG. 2: Diagnostic panel in Armonía Pro Audio Suite.
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powersoft Quattrocanali Series Specifications

General

Number of Channels	4
Frequency Response	20 Hz - 20 kHz (±0.5 dB)
Input Impedance	20 kΩ balanced
Protection	DC, thermal, short circuit, overload
Remote Control	Optional