BSS Audio DPR-504 Owner's Manual - Manual (Page 11)

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5.2 Main Outputs The outputs of each channel are electronically balanced and floating, and
provide ample power to drive all professional and semi-professional audio
equipment whose input impedance is 600 ohms or greater. The nominal input
impedance will be the same as the input level when the gate is 'open', as the
DPR 504 makes no gain contribution. The maximum output level is +20dBv
into a load of 600 ohms.
Connector wiring is show in figures 5.3 & 5.4. Should an unbalanced output be
required, then the Cold '-' pin must be connected to Pin 1 to ensure no loss of
output level.
For some rack mounted systems, the chassis or safety power ground might
need to be isolated from the signal ground. Reference should be made to
section 7.2 for further information.
Fig 5.3
Fig 5.4
This rear mounted 1/4" RTS jack socket provides an input to the key side
chain. Refer to section 7.9 for an explanation of its use and operation. Wiring
is shown for a mono plug, as the input is unbalanced. However, an RTS stereo
plug will be automatically unbalanced when inserted. 5.3 EXT Key Input
Fig 5.5