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Why does port length increase when two ports replace one?

14442 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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With a good 15 your going to need a huge cabinet.
Not necessarily - some 15" drivers work quite well in a relatively small (~2 cubic feet) box. However, the efficiency is pretty horrible - expect to use a 1kW+ amp to get the most out of 'em.
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