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Why does port length increase when two ports replace one?

14440 Views 14 Replies 8 Participants Last post by  talunceford, 
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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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Thanks!

So in some builds it may well be better to tune the sub to a higher Hz? And is it worth using something like bitumen dampening on a port? Or what about multiple straw filled type ports, do these behave in a different manner?
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