Page 18
APA-4E8 Operator’s Manual
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Rear Panel Controls and Sockets
1: Mains Input Socket: Mains connection is via a 32A ”Powercon” type plug. Supply voltage is
100-240V AC. This unit must be earthed.
2: GPIO Socket: Connections are via Phoenix “mini” connectors. They can be used to provide
feedback of fault conditions, as well as being used to trigger different amplifier events such
as mutes, standby, and emergency evacuation message playback. Please see page 19 for
more information on the current capabilities.
3: RS485 Output Socket: This socket is intended for connection to other XTA processors for
control data bridging from the Ethernet control port. It is not intended to be used as a
method of primary remote control of this amplifier. Please see page 14 for more information.
4: Comms Status LEDs: This group of 4 tricolour LEDs shows if the current Ethernet and
RS485 comms ports are connected and in use. More information on their various modes of
operation is given on page 19.
5: CTRL Ethernet Socket: This RJ45 socket connects the amplifier to a valid Ethernet
network for remote control and monitoring.
6: AUD1 & AUD2 Ethernet Sockets: This pair of RJ45 sockets connect the amplifier to a valid
Ethernet network for transmission of audio data.
7: Input Status LEDs: This group of 4 tricolour LEDs can show various information about
signal level or lock status in AES mode. Please see page 19 for more information.
8: Analogue and AES Digital Input Sockets: By default these four sockets are four analogue
inputs, but individual pairs of sockets can be switched (via remote software and memory
recall via the front panel) to receive AES digital audio. AES input on channel A’s XLR provides
a stereo stream designated AES A + AES B; AES input on channel C’s XLR provides a stereo
stream designated AES C + AES D. When an AES input is selected, the “other” channel of the
pair is disabled (you cannot input analogue into channel B XLR if A&B are set to AES mode).
9: Speaker Output Sockets 1&2: The primary speaker outputs are via Neutrik Speakon
connectors on 1+ and 1-. Two pole (NL2FC) or four pole (NL4FC) connectors can be used.
Additionally Channel 1 Speakon connector carries Channel 2 output on Pins +2 & -2 to allow
easy bi-amping or bridged operation using a single NL4 connector.
10: Speaker Output Sockets 3&4: The primary speaker outputs are via Neutrik Speakon
connectors on 1+ and 1-. Two pole (NL2FC) or four pole (NL4FC) connectors can be used.
Additionally Channel 3 Speakon connector carries Channel 4 output on Pins +2 & -2 to allow
easy bi-amping or bridged operation using a single NL4 connector.
