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6. Connections
UXA4403 amplifier rear panel connections are
illustrated in Diagrams 5a.
6.1 Mains Power Connection
UXA4403 amplifiers incorporate a power factor corrected
universal power supply and can be used with mains input
voltage from 100V AC to 240V AC, 50/60Hz. Use the mains
cable supplied with the amplifier.
UXA4403 amplifiers have no mains power switch and are
operational as soon as mains power is connected. Ensure that
all signal, GPIO and output connections are made before
connecting the amplifier to mains power.
6.2 Input Connection
All UXA4403 amplifier models provide four balanced or
unbalanced analog audio inputs and a stereo S/PDIF digital
audio input. Any input channel can be routed to any output
channel. Input routing options can be configured via the
amplifier network interface. See Section 5 of this manual.
Analog Inputs
UXA4403 analog inputs are of line level format with a default
input sensitivity of +4dBu (full output voltage swing/sensitivity)
in all output modes. Input signal levels up to +24dBu can be
handled without input clipping. Input sensitivity options can
be set via the amplifier network interface. See Section 5 of this
manual.
Balanced input connections to the amplifiers are made via male
'Euro Block' connectors. Connecting cables to the supplied
female input connectors is illustrated in Diagram 5b.
Unbalanced input connections to the amplifiers are made via
RCA phono sockets connected in parallel with the balanced
inputs.
Diagram 5a
UXA4403rear panel connections.
Note: Two output amplifier model connection sockets differ only in
the deletion of channel 3 and channel 4 output connectors.
Connections
Digital Inputs
UXA4403 amplifier S/PDIF stereo digital audio input
connections are made via a single RCA Phono socket. The S/
PDIF input is connected by default to amplifier installation
Zones A (left) and B (right).
Digital Outputs
UXA4403 amplifier S/PDIF stereo digital audio output
connections are made via a single RCA Phono socket. The S/
PDIF output signal by default reflects the input to amplifier
installation Zones A and B and is intended to be used for daisy-
chaining UXA4403 amplifier.
Note: 75Ω RCA Phono cables specifically intended for digital audio
should always be used for S/PDIF connections. Standard Phono
cables can be used but may not result in optimal performance.
Note: The S/PDIF output level is by default set at -10dB to reduce
the possibility of downstream input clipping.
6.3 Output Connections
Output connections from the amplifiers are achieved via male
'Euro Block' connectors. Ensure that speaker connection
polarity is correct throughout the installation:
In the case of Lo-Z speaker connections, positive (+) amplifier
terminals should always be connected to positive speaker
terminals and negative (–) amplifier terminals always connected
to negative speaker terminals.
In the case of Hi-Z speaker connections, the two speaker cable
conductors should be connected between the positive (+)
terminal of Output 1 and the negative terminal (-) of Output 2,
and likewise for Outputs 3 and 4.
Output mode options (Lo-Z or Hi-Z) can be configured via the
amplifier network interface. See Section 5 of this manual.
Connecting cables to the supplied female output connector is
illustrated in Diagram 5c.
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