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7. Operation
Once all connections have been made and configuration
options selected, UXA4403 amplifiers are ready for
use. If an input signal above -60dB is present on any
input, the front panel Input and Standby indicators will
illuminate green to indicate normal amplifier operation.
Audio will be heard from any connected speakers.
Note: UXA4403amplifiers will not switch on from Standby Mode
unless an input signal is present, a network 'ON' command is
received, or an external standby switch (or 12V trigger) is operated.
Standby behaviour can be configured via the Power Management
menu of the Settings Tab.
Amplifier outputs will mute if no input signal is present for 5
minutes, and the amplifier will switch automatically to Standby
Mode if no signal is present on any input for more than 15
minutes. Alternative standby and mute delay times can selected
via the Settings Tab. Amplifier cooling fan speed is temperature
controlled. The fan will switch off when the amplifier enters
standby mode.
7.1 Front Panel Indicators
UXA4403 amplifier front panel indicators illuminate to indicate
the following operational states:
Status:
Off – Mains power disconnected.
Green – Amplifier operational.
Pulse Green – Standby Mode.
Amber – GPIO triggered Standby Mode
Input:
Off – No input signal present.
Green – Signal present on one or more inputs.
Amber – Signal limiting/clipping on one or more
inputs.
Output:
Off – No output signal present.
Green – Signal present on one or more outputs.
Amber – Signal limiting/clipping on one or more
outputs.
Red – One or more channel pair is in
overload/protection mode.
Network: Off – No Ethernet network detected.
Green – Ethernet network detected.
WiFi:
Off – WiFi disabled.
Green – WiFi enabled.
Operation
7.2 Automatic Power Sharing
UXA4403 amplifiers incorporate a power sharing feature
that automatically shares the total power available from the
amplifier's internal power supply across each pair of output
channels. If one channel temporarily demands more than the
amplifier's continuous power rating while other channel is
demanding less, the excess power available from the internal
power supply is automatically made available to the over-
power channel. Power sharing optimises the amplifier's ability
to deliver maximum power into dynamic loudspeaker loads
when playing music programme material.
7.3 Default Reset
UXA4403 amplifiers can be returned to their default settings
via either the Control Web App Settings Tab or the hardware
reset pinhole button. The reset pinhole button is located on the
underside panel of the amplifier.
To reset the amplifier using the pinhole button, follow the steps
below:
• Disconnect the amplifier from mains power.
• Use an appropriate tool to press and hold the reset
pinhole button while simultaneously reconnecting mains
power.
• Continue to hold the reset pinhole button for a few
seconds as the amplifier restarts.
The amplifier will restart with all settings at their default state.
Any previously configured settings will be deleted.
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