ALC2 User’s Manual. Rev. 01
15
6. Connections __________________________________________________
Inputs
The ALC2 has female XLR connectors for the signal inputs and male XLR connectors for the input links. These connectors are wired with pin 2 ‘hot’.
XLR connectors viewed at the rear of the amplifier.
1 = Ground
2 =
3 = Signal –
The link connectors are internally hardwired to the input connectors and can be used to daisy chain the input signals to another amplifier. If you want to drive the
amplifier from an unbalanced source, preferably connect pin 3 to pin 1 in the source connector. If this is not possible, connect pin 3 to pin 1 at the amplifier’s
connector. Remember, that balanced connections are less susceptible to AC hum, however unbalanced signals can be used for short cable runs.
Outputs
Loudspeakers are connected using Speakon® connectors. For each channel two Speakon® connectors are available which are connected in parallel. Due to the
SIS (Signal Integrity Sensing) feature on the ALC2, there are four connections per channel instead of two. The two extra wires are used for voltage sensing at
the loudspeaker terminals. The and sense+ wires are connected together at the loud terminal, and the output- and sense- wires are connected
together at the loudspeaker- terminal. All Alcons loudspeaker cabinets are SIS pre-wired. If your loudspeakers are not prepared for SIS wiring you can connect
the sense wires to the output wires at the loudspeaker input. If you do not want to use the SIS feature at all, the sense wires should be connected to the output
wires at the amplifier output in the Speakon® connector.
WARNING!
Never connect the sense+ to the output- terminal or vice versa, or short circuit both sense wires! Since you are disabling the amplifier’s feedback network, the
amplifier can produce a large amount of DC at its output. This will severely damage your amplifier or loudspeakers.
