D200 Mod 2.0.1

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The 2x10 pin connector is 2x4 (+ signal left), 2x4 (+ signal right) and 2x2 (signal ground).

Hmmm. Considering that the 2x2 poles of the ground connector presumably have to carry the return current from all 2x8 poles of the left and right speakers outputs I wonder whether that in itself might have some bearing on the improved performance in dual-mono mode, where the relatively higher-resistance ground path won't be used. (Seems a bit far fetched but in the spirit of the thread I'm trying to be open-minded...)