Ashly FA-250.4 Manuale operativo - Pagina 8
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FA Amplifier • Operating Manual
5
Rear Panel Features
5.1
Maintenance
This USB-C connector is used
for firmware update.
5.2
DIP Switches
The DIP switches set Low-Z
or Hi-Z mode per channel,
70V/100V output when in
Hi-Z mode, +4dB/-10dBV
Input Sensitivity, Standby
Polarity, and Front Panel Lock.
The illustrations below show
four-channel models, but are
similar to the two-channel model.
5.2a
Low-Z/High-Z Select
Each channel can
be individually set
for low impedance
output (Lo-Z, 4
or 8 Ohm) or high
impedance (Hi-Z,
70V or 100V)) for
driving constant voltage speaker lines. Set the
switch
for Low-Z and
5.2b
Hi-Z 70V/100V Select
On channels set
for Hi-Z output,
this switch sets the
output voltage to
either 70V or 100V.
This is a global
switch, meaning all
channels set to Hi-Z will be either 70V or 100V.
Set the switch
for 70V and
FA-125.4 shown, other models have similar features
5.2c
Input sensitivity
is the input signal
level which will drive
the amplifier to full
output. This switch
sets input sensitivity
for all inputs to either
+4dBu for typical pro audio device outputs, or
-10dBv for typical hi-fi level devices. Set the
switch
5.2d
for Hi-Z.
This switch sets the
polarity requirement
for placing the
amplifier into standby
using the contact
closure pin
5.3b).
Set the switch to the
open), for the amplifier to go into standby mode
when the standby pin is connected to ground.
for100V.
Set the switch to the
closed) for the amp to go into standby mode
Input Sensitivity Select
for +4dBu, or
for -10dBV sensitivity.
Standby Polarity Select
(sec.
position (normally
position (normally
when the standby pin is pulled high or left
unconnected.
5.2e
Front Panel Lock
To lock all front panel controls, set the switch to
the
position. Set the switch
to unlock.
When the front
panel level controls
become locked, their
current values are
saved. In order to
avoid high volume
when unlocking the
unit, the volume will not change until the level
control positions are at or lower than their
initial saved values. If unsure, turn level controls
all the way down before unlocking.
Note: Remote DC level (VC) inputs continue to work
normally even when front panel controls are locked.
Locking the power switch only prevents the
amp from being turned off. If the switch is
locked and AC power gets interrupted while the
unit is on, the amp will automatically power up
again when AC is restored.
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