Why does port length increase when two ports replace one?

I was thinking of building a sub box similar to the svs with 3 ports, but winisd gives me ridiculous port lengths. How does svs get away with having three ports?

Moonfly said:

In respect of BKnights comments, I had a play with WinISD last night, and managed to get port lengths to around a meter each with a 15" driver, its still a lot for a box though, and I think a Sonotube would be the only realistic way to build an SVS Ultra type sub with a 15" driver.

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I was modeling a dayton 12in hf in a 4.2ft³ and wanted the look of the svs with 3 ports. I like how proportional the box looks in regards to the driver and 3 ports.

but it seems i won't be able to get that look with this sub, guess i'll have to save this look for a 15in driver like the tempest which was more reasonable with three ports

Moonfly said:

Ill try take a look at the model(s) tomorrow and see if I can come up with anything of use, if no one beats me to the punch.

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Thanks I was planning on using the 4 in flared ports from PE which can be up to 17 in long.
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