I/O Connectors; Input [12] And Input Link [13]; Mix In [14]; Speaker Out [15] - d&b audiotechnik E-PAC Hardware Manual

Pin assignment E-PAC signal inputs
E-PAC SPEAKER OUT NL4
E-PAC, Hardware manual

4.2. I/O Connectors

[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).

4.2.1. INPUT [12] and INPUT LINK [13]

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.

4.2.2. 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.

4.2.3. SPEAKER OUT [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.
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