BSS Audio DPR-504 Owner's Manual - Manual (Page 10)

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5.0 Audio Connections
Audio Connections
The DPR 504 is designed to operate at nominal line levels and not at
microphone signal levels. The gating of microphone signals must be done
after the mic-amp, or gain increase section of a mixing console input channel,
and would generally occur at the pre-fader or pre-equaliser insert point of the
particular channel.
We would recommend all wiring to be done with two-conductor shielded
cable. The shield should not carry any signal currents, and be used only for
shielding. It is ordinarily connected to a ground point at one end only.
5.1 Main Inputs The electronically balanced input of each channel is compatible with all
professional and semi-professional sound equipment, balanced or unbalanced,
whose source impedance is 600 ohms or less. The nominal input level is
between -10dBv and +10dBv, with an upper maximum or +20dBv.
Connector wiring is shown in figures 5.1 & 5.2. There is no internal connection
to the Pin 1 terminal, and therefore the cable shield grounding must be
derived from the source equipment. This arrangement provides an automatic
break in the grounding of interconnected equipment and will ensure noiseless
operation of the equipment. If European 4 conductor cable is being used for
interconnections, then special attention must be given to avoiding earth loops
through multiple chassis ground connections.
Fig 5.2
Fig 5.1
For non standard connections, such as unbalanced lines, remember:
• Always use Hot '+' and Cold '-' signal pins as the two input terminals.
• When driven from an unbalanced source, connect the '-' terminal to the
source ground connection, as well as to the shield of the cable.
• When driven from a balanced source, connect the cable shield to chassis
ground at the source end only.