BSS Audio FCS-966 Owner's Manual - Manual (Page 11)

When using the FCS 966 to drive unbalanced inputs, best performance is
usually obtained by connecting the FCS 966s ‘+’ signal to the equipment signal
pinand the ‘-’ signal to the equipment shield.
The FCS 966 shield should normally be connected to the equipment shield,
preferably at the equipment end. Transformer isolated outputs are also
available as a dealer fitted option.
5.3 Jack Inputs The jack inputs are electrically identical to the XLR inputs. The ‘HOT, +, or
in phase’ connection is to the jack plug tip, the ‘COLD, - or out of phase’
connection to the ring. The shield is internally connected to the chassis earth
via a low value capacitor. This ensures freedom from ground loops whilst
allowing good EMC performance. The screen of the cable must be connected
to the jack plug shield to ensure continued compliance with EMC regulations.
The cable shield ground should be connected to the equipment which is
providing the input signal.
Fig 5.5
Fig 5.6
Fig 5.4
When feeding the FCS 966 from unbalanced sources, connect the signal
conductor to the jack plug tip and the cable screen to the plug ring and shield.
966 Jack Input
966 Jack Input