box designs specifics

[evilG_36]

i have a 15" solobaric that i have been running in a sealed enclosure of about 4.2cf.

i want to make a ported enclosure but i was wondering about some specifics:

the difference in sq/spl for a 5 cf enclosure vs a 3 cf enclosure

the difference between a port area of 100 cu in vs 50 cu in

and if there is any difference in sound with respect to an extremely short port vs a very long one.

thanks

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[evilG_36]

anybody?

i'd love to know these things