d&b audiotechnik E-PAC, Hardware Manual

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5.3. Signal inputs and link outputs
[15] [14] [12] [13]
E-PAC I/O Connectors
All signal input and output connections are located on the rear panel.
These include analogue signal inputs (INPUT/MIX IN), link output (LINK)
and a NL4 loudspeaker output (SPEAKER OUT).
5.3.1. INPUT [12] and LINK [13]
Pin assignment E-PAC signal inputs
The E-PAC signal input connector is a 3 pin female XLR.
Below and wired in parallel is a 3 pin male XLR input link connector used
to feed the input signal on to the next device in the system signal chain.
5.3.2. MIX IN [14]
A 3 pin female XLR connector provides a MIX IN input. A second signal
fed to this input is summed to the main INPUT. If Left and Right
components of a stereo source are fed to the main INPUT and MIX IN
connections then a mono sum signal is derived from the speaker output.
Please note that the resultant output is 3 dB higher.
The output on the INPUT LINK connector is derived from the signal fed
to the INPUT connector. An additional signal fed to the MIX IN
connector will not appear at the INPUT LINK output.
5.4. Loudspeaker output connectors - [15]
The E-PAC is fitted with a single Speakon-NL4 speaker output
connector. With configuration settings which transmit full-range signal
(e.g. E3 or LINEAR) all four pins on the Speakon connector are driven,
pins 1+ and 2+ carry positive signal, 1– and 2– carry negative signal.
With SUB configurations selected pin 1+ is disconnected automatically.
This prevents mid-high cabinets from accidental damage by subwoofer
signal.
E-PAC Amplifier, Hardware manual (1.2 EN) Page 13 of 24