BSS Audio FDS-310 Owner's Manual - Manual (Page 14)

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Input Connections
9.0 Input Connections
Each jack socket accepts signal sources from a 3-pole (stereo), or 2-pole
(mono), 'A' gauge phone plug (See Figure 9.1).
The balanced input of the FDS-310 will accept both balanced or unbalanced
signal feeds, without needing any modification.
There is no internal ground connection to the 'sleeve' on the input jack
socket, to avoid possible interconnection earth loops. The input signal cable
shield must therefore be tied to ground, or signal 0V, at the source end.
9.1 Using Jack
Plugs.
Fig 9.1 Phone Jack
Wiring
Fig 9.2 XLR Plug Wiring
Each female XLR receptable accepts both balanced and unbalanced signal
sources. For balanced sources, the incoming XLR plug should be connected as
follows (See Figure 9.2):
Pin 1: No connection (it is good practice to terminate the drain wire of
the shield here).
Pin 2: Signal '-', out of phase or 'COLD'.
Pin 3: Signal '+', in phase or 'HOT'.
For unbalanced sources (See figure 9.2):
Pin 1: Leave open, or link to pin 2.
Pin 2: Shield, braid, or screen wire.
Pin 3: Signal '+' or 'HOT' (inner core).
There is no internal ground connection to Pin 1 of the female XLR to avoid
possible interconnection earth loops. The input signal cable shield must
therefore be tied to ground, or signal 0V, at the source end. See section 21 for
help with grounding procedure.
9.2 Using XLR Plugs.