If you used the resistor values you mentioned then HF loss is not too surprising, unless cables were very short. Try lower values.
The basic difference between the two circuits is that B treats pin 1 as a reference voltage for common-mode signals. This may or may not be a good thing. My understanding is that pin 1 is supposed to be for the cable shield, and nothing to do with signal voltages. Option B reduces the common-mode impedance, which may or may not be a good thing. I guess to some extent it depends on how the source and load are implemented: biphase or transformer?
The basic difference between the two circuits is that B treats pin 1 as a reference voltage for common-mode signals. This may or may not be a good thing. My understanding is that pin 1 is supposed to be for the cable shield, and nothing to do with signal voltages. Option B reduces the common-mode impedance, which may or may not be a good thing. I guess to some extent it depends on how the source and load are implemented: biphase or transformer?
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