▶
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Duecanali User Guide
▶
PWRBSCH1: amplier’s power supply voltage for channel 1
▶
PWRBSCH2: amplier’s power supply voltage for channel 2
Pressing the “more” button on the screen allows to cycle through
a greater number of pages containing more information; the
“back” button will bring the user back to the previous setup menu.
▶
VAUX: internal auxiliary voltage
▶
+5VAN: auxiliary analog voltage
▶
VEXT: external remote control voltage
▶
VAUX: indicates if the power supply auxiliary voltage is
correct
▶
IGBTCONV: indicates the DC/DC converter monitor status
▶
VBOOST: internal post PFC voltage
▶
192KHZ: system clock frequency status
13.3 LCD contrast
This screen allows the user to set the LCD display contrast using
the “+” and “-” buttons.
Contrast
back
-
+
6
FIGURE 72: Setting screen for the LCD display contrast
13.4 Key Locking and Setting The Keylock Code
In order to prevent the amplier’s settings from being altered by
acting on the front panel commands, the “lock” function can be
activated if the corresponding button is held pressed for more
than 1 second; in this case all other buttons are locked. Unlocking
buttons is done in the same way, but an unlock code is required
for security reasons. In order to enter an unlock code for the
amplier, select the “Set Keylock Code” from the Setup Menu.
Please note that this screen can also be accessed by pressing the
“unlock” button in the main screen when the amp is in locked key
mode. Using the two central buttons, chose and set an unlock
code. Pressing the right most key (labelled “sel”) allows to select
the desired digit.
Set keylock Code
000000
back
sel
-
+
FIGURE 73: Setting the keylock code screen
13.5 Single Channel Muting
Muting of one channel at a time can be done via the “mute”
function directly from the amplier’s front panel. Pressing the
button directly below the “mute” label can mute each channel
individually; in this case, the on screen channel-specic parameters
are replaced by the “muted” label. Unmuting the channels is done
by pressing the “mute” button again.
lock
mute mute menu
CH1 READY
V I MUTED
FIGURE 74: Example of a muted right channel. To unmute the
channel, press the right most “mute” button again
14 Protection
In order to protect your device and your speakers from accidental
damage, Duecanali Series ampliers include an extensive
automatic protection system. In the following sections, potentially
dangerous scenarios and the ampliers’ corresponding protective
response are explained in detail.
14.1 Turn-On/Turn-Off muting
For about four seconds after turn-on, and immediately at turn-off,
the amplier outputs are muted. Class D ampliers may cause
severe speaker damage at power up due to the high voltage levels
at the output stage. In order to avoid this, the outputs are muted
for about 4 seconds after turn on. Similarly, turning off the amplier
can cause the same problem: outputs are muted immediately at
turn off.
14.2 Short circuit protection
Short circuits or very low impedance loads may destroy the
output stage of any amplier. In order to protect the amplier
from the dangerously high current surges arising from accidental
output short circuits or low impedance loads, all Duecanali Series
amps block channel activity when the current drawn from the load
rises above a set value. In case of short circuit, the topmost front
panel red LED will light-up. At the same time, the “PROT” warning
appears in the rst line of the LCD display. The channel is muted
for 2 seconds after which the amplier will check whether the
current draw is still over the safety threshold. Should this be the
case, the amplier will mute the channels for another 2 seconds
and the procedure will reiterate. The amplier will therefore
automatically self-reset every 2 seconds. Once the amplier has
undergone 50 resets, and the output current draw is still above
safe limits, the unit enters a permanent protection mode: an on/off
cycle is needed to restart the unit and restore it to full functioning
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