design help

[DB-Audio 10+ year member]

building a box for a friend its gonna be 1 alpine type s 12" sub alpine calls for 1.55 optimum ported so the box is gonna be 14"x14"x20" which roughly is 1.86 cubes now my calculation is that with 2 2" areo ports to tune to 32hz they are both gonna need to be 8.4" long my question will that be enough port area?

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[Smitty]

Might need more port area....

Hit up Kevin at Skar Audio. He makes excellent boxes & is a great guy.

 

[thevic24 5,000+ posts]

Why not just use one 4"?

 

[DB-Audio 10+ year member]

thank for the advise how much port area would you suggest

 

---------- Post added at 09:49 PM ---------- Previous post was at 09:48 PM ----------

 

my friend wanted 2 so figured id make it to his liking

 

[skylineTT 10+ year member]

A single 3 would be fine for that sub so I would assume 2 2"s would probably be okay. do you think you could try 2 3"s and just lengthen them to where it is tuned correctly?