Another Port Question

When do you guys decide to use two ports, instead of one?
Is this largely personal preference, or is there a lot more to it than that?

I'm not sure whether I should use one 3" port, or two 2" ports.
It would be easier to make one.... People may also use 2 ports when it is a dual chambered box..

 
IMO. more ports = less port noise. but i may be wrong.
spmewhat right, but lets say u have a port 10cm in diametar that requires lenght of 25 cm to get the tunning u what..if u put two 7.5 cm ports ull get the same tunning frquency at almost twice the lenght(the numbers are just for example but not far off)..

 
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