RC, my view is that you're trying to cut this a bit too fine. As Mr. Russell pointed out, his suggestions were "conservative". I wouldn't have been concerned about a single 16 gauge run in your situation, and the double run(equivalent to 13 gauge) is certainly plenty. Yes,if the resistance of the wire is too high the output of the amp will tend to "follow" the swings in speaker impedance, slightly over-emphasizing the response at impedance high points, such as often exist in the bass area.

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Enjoy the music, not the equipment.