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Why does port length increase when two ports replace one?

14446 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?
1 - 1 of 15 Posts
It's because they are Helmholtz resonators. Using multiple ports is similar to a single larger port with the same surface area. Larger ports = longer lengths for any given enclosure volume and tuning frequency.
1 - 1 of 15 Posts
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