sealed to ported

[NewToTheGrounds 10+ year member]

i have at current a sealed box with two 10" subs i want to go to ported box i dont have the specs any more is there a formula or something i know the specs for the sealed box and what the subs need for a sealed box is there a formula or something i can use with those specs to figure out what i should use for a ported box?, hopefully this makes sence, thanks

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[DFW40 10+ year member]

what brand and model subs?

 

[NewToTheGrounds 10+ year member]

there old PPi's