If I followed your post correctly (I'm still not on the same page about the differences in the port opening vs. the inside of the port if we're talking a slot port), ku40 is correct. It's all about surface area and volume.
Quote:
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In the same box, a 36 sq. inch slot port would be the same length as a 36 sq. inch round port for the same tune.
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is right on the money.