BSS Audio DPR-901II Owner's Manual - Manual (Page 10)

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DPR-901ii
Ground Loop Control
2.8 Ground Loop
Control
Strict adherence to the wiring conventions noted above within a fully
balanced signal system will yield the best possible results with none of
the problems normally associated with interconnected audio equipment.
Wherever possible, cable screens should not be connected to any signal
pin, but rather left to perform a cable shielding function only.
Where it is not possible to control all of the external cabling, it might
become necessary to have the internal electronic ground of your unit
separated from the case safety ground. Provision is made internally
within the DPR-901ii to separate these two grounds at a convenient
point, or to add a suitable impedance network as part of a house system
requirement. Please see appendix.
Under no circumstances should the safety ground wire be removed from
the mains AC power connector as an interim measure to achieve similar
results.