Getting back to the original subject, Elizabeth I would second Stevecham's earlier suggestion that the 7 meter Parsec might be defective. The Parsec is described as having two conductors surrounded by a braided shield. If the shield is properly connected to pin 1 at both ends, I would expect it to provide an effective ground path.
If you still have that cable, and if you haven't already done so, I would use a multimeter to check for continuity between the two connectors, for each of the three pins.
If you have a multimeter and do that, if possible also check that there is no continuity between pin 1 and an exposed metal point on the shell of each of the connectors. IME XLR cables generally have no connection between pin 1 and the connector shell; if there is such a connection in your particular cable (either by design or by defect) it's conceivable that it could create the incompatibility you described, depending on the internal grounding configuration of the components.
Best regards,
-- Al
If you still have that cable, and if you haven't already done so, I would use a multimeter to check for continuity between the two connectors, for each of the three pins.
If you have a multimeter and do that, if possible also check that there is no continuity between pin 1 and an exposed metal point on the shell of each of the connectors. IME XLR cables generally have no connection between pin 1 and the connector shell; if there is such a connection in your particular cable (either by design or by defect) it's conceivable that it could create the incompatibility you described, depending on the internal grounding configuration of the components.
Best regards,
-- Al

