The Focal 1038be has a nominal impedance of 8 ohms. I would definitely stick with the 8 ohm impedance which is the impedance Mac would recommend.
Many folks like to take a speaker rated at 4 ohms and use the 8 ohm tap. Mac does not recommend doing this because with an inefficient speaker, it can over stress the amp and decrease its longevity. When you take a 4 ohm speaker and use the 8 ohm tap you create a larger more dynamic amp at the expense of longevity.
Best
Charles
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