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Why does port length increase when two ports replace one?

14440 Views 14 Replies 8 Participants Last post by  talunceford
As per title,

Just wondering why two ports are required to be longer than a single port?

For instance if I tune a cab with a single 10" port, but the port velocity is too high and I add another port, these ports are then required to be 22.5" long each?
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I wouldn't ever sacrifice tuning frequency for a shorter port, unless onyl absolutely necessary. Another hugely important note is that the cross-sectional area of the port will allow enough airflow for the sub(s) of the given design. I think air velocity should not exceed 30 m/s. Anybody correct me if I'm wrong here...
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