The only reason I can envision for why there might be a difference between having the two runs connected together at the amp end within the cable vs. within the amp (between the two sets of binding posts) are possible differences in contact integrity. If you are confident that the contacts on the new cables and on the amp connectors you are using are clean and making good contact, as Stereo5 indicated I would not expect separating the wires to make any difference.
And if for some reason it were to make a difference, I see no reason to expect it to necessarily be for the better.
Regards,
-- Al
And if for some reason it were to make a difference, I see no reason to expect it to necessarily be for the better.
Regards,
-- Al